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freebsd-dev/sys/kern/subr_stats.c
Lawrence Stewart 1eb402e47a stats(3): Improve t-digest merging of samples which result in mu adjustment underflow. 
Allow the calculation of the mu adjustment factor to underflow instead of
rejecting the VOI sample from the digest and logging an error. This trades off
some (currently unquantified) additional centroid error in exchange for better
fidelity of the distribution's density, which is the right trade off at the
moment until follow up work to better handle and track accumulated error can be
undertaken.

Obtained from:	Netflix
MFC after:	immediately
2021-04-02 13:17:53 +11:00

3952 lines
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/*-
* Copyright (c) 2014-2018 Netflix, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Author: Lawrence Stewart <lstewart@netflix.com>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/arb.h>
#include <sys/ctype.h>
#include <sys/errno.h>
#include <sys/hash.h>
#include <sys/limits.h>
#include <sys/malloc.h>
#include <sys/qmath.h>
#include <sys/sbuf.h>
#if defined(DIAGNOSTIC)
#include <sys/tree.h>
#endif
#include <sys/stats.h> /* Must come after qmath.h and arb.h */
#include <sys/stddef.h>
#include <sys/stdint.h>
#include <sys/time.h>
#ifdef _KERNEL
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rwlock.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#else /* ! _KERNEL */
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#endif /* _KERNEL */
struct voistatdata_voistate {
/* Previous VOI value for diff calculation. */
struct voistatdata_numeric prev;
};
#define VS_VSDVALID 0x0001 /* Stat's voistatdata updated at least once. */
struct voistat {
int8_t stype; /* Type of stat e.g. VS_STYPE_SUM. */
enum vsd_dtype dtype : 8; /* Data type of this stat's data. */
uint16_t data_off; /* Blob offset for this stat's data. */
uint16_t dsz; /* Size of stat's data. */
#define VS_EBITS 8
uint16_t errs : VS_EBITS;/* Non-wrapping error count. */
uint16_t flags : 16 - VS_EBITS;
};
/* The voistat error count is capped to avoid wrapping. */
#define VS_INCERRS(vs) do { \
if ((vs)->errs < (1U << VS_EBITS) - 1) \
(vs)->errs++; \
} while (0)
/*
* Ideas for flags:
* - Global or entity specific (global would imply use of counter(9)?)
* - Whether to reset stats on read or not
* - Signal an overflow?
* - Compressed voistat array
*/
#define VOI_REQSTATE 0x0001 /* VOI requires VS_STYPE_VOISTATE. */
struct voi {
int16_t id; /* VOI id. */
enum vsd_dtype dtype : 8; /* Data type of the VOI itself. */
int8_t voistatmaxid; /* Largest allocated voistat index. */
uint16_t stats_off; /* Blob offset for this VOIs stats. */
uint16_t flags;
};
/*
* Memory for the entire blob is allocated as a slab and then offsets are
* maintained to carve up the slab into sections holding different data types.
*
* Ideas for flags:
* - Compressed voi array (trade off memory usage vs search time)
* - Units of offsets (default bytes, flag for e.g. vm_page/KiB/Mib)
*/
struct statsblobv1 {
uint8_t abi;
uint8_t endian;
uint16_t flags;
uint16_t maxsz;
uint16_t cursz;
/* Fields from here down are opaque to consumers. */
uint32_t tplhash; /* Base template hash ID. */
uint16_t stats_off; /* voistat array blob offset. */
uint16_t statsdata_off; /* voistatdata array blob offset. */
sbintime_t created; /* Blob creation time. */
sbintime_t lastrst; /* Time of last reset. */
struct voi vois[]; /* Array indexed by [voi_id]. */
} __aligned(sizeof(void *));
_Static_assert(offsetof(struct statsblobv1, cursz) +
SIZEOF_MEMBER(struct statsblobv1, cursz) ==
offsetof(struct statsblob, opaque),
"statsblobv1 ABI mismatch");
struct statsblobv1_tpl {
struct metablob *mb;
struct statsblobv1 *sb;
};
/* Context passed to iterator callbacks. */
struct sb_iter_ctx {
void *usrctx; /* Caller supplied context. */
uint32_t flags; /* Flags for current iteration. */
int16_t vslot; /* struct voi slot index. */
int8_t vsslot; /* struct voistat slot index. */
};
struct sb_tostrcb_ctx {
struct sbuf *buf;
struct statsblob_tpl *tpl;
enum sb_str_fmt fmt;
uint32_t flags;
};
struct sb_visitcb_ctx {
stats_blob_visitcb_t cb;
void *usrctx;
};
/* Stats blob iterator callback. */
typedef int (*stats_v1_blob_itercb_t)(struct statsblobv1 *sb, struct voi *v,
struct voistat *vs, struct sb_iter_ctx *ctx);
#ifdef _KERNEL
static struct rwlock tpllistlock;
RW_SYSINIT(stats_tpl_list, &tpllistlock, "Stat template list lock");
#define TPL_LIST_RLOCK() rw_rlock(&tpllistlock)
#define TPL_LIST_RUNLOCK() rw_runlock(&tpllistlock)
#define TPL_LIST_WLOCK() rw_wlock(&tpllistlock)
#define TPL_LIST_WUNLOCK() rw_wunlock(&tpllistlock)
#define TPL_LIST_LOCK_ASSERT() rw_assert(&tpllistlock, RA_LOCKED)
#define TPL_LIST_RLOCK_ASSERT() rw_assert(&tpllistlock, RA_RLOCKED)
#define TPL_LIST_WLOCK_ASSERT() rw_assert(&tpllistlock, RA_WLOCKED)
MALLOC_DEFINE(M_STATS, "stats(9) related memory", "stats(9) related memory");
#define stats_free(ptr) free((ptr), M_STATS)
#else /* ! _KERNEL */
static void stats_constructor(void);
static void stats_destructor(void);
static pthread_rwlock_t tpllistlock;
#define TPL_LIST_UNLOCK() pthread_rwlock_unlock(&tpllistlock)
#define TPL_LIST_RLOCK() pthread_rwlock_rdlock(&tpllistlock)
#define TPL_LIST_RUNLOCK() TPL_LIST_UNLOCK()
#define TPL_LIST_WLOCK() pthread_rwlock_wrlock(&tpllistlock)
#define TPL_LIST_WUNLOCK() TPL_LIST_UNLOCK()
#define TPL_LIST_LOCK_ASSERT() do { } while (0)
#define TPL_LIST_RLOCK_ASSERT() do { } while (0)
#define TPL_LIST_WLOCK_ASSERT() do { } while (0)
#ifdef NDEBUG
#define KASSERT(cond, msg) do {} while (0)
#define stats_abort() do {} while (0)
#else /* ! NDEBUG */
#define KASSERT(cond, msg) do { \
if (!(cond)) { \
panic msg; \
} \
} while (0)
#define stats_abort() abort()
#endif /* NDEBUG */
#define stats_free(ptr) free(ptr)
#define panic(fmt, ...) do { \
fprintf(stderr, (fmt), ##__VA_ARGS__); \
stats_abort(); \
} while (0)
#endif /* _KERNEL */
#define SB_V1_MAXSZ 65535
/* Obtain a blob offset pointer. */
#define BLOB_OFFSET(sb, off) ((void *)(((uint8_t *)(sb)) + (off)))
/*
* Number of VOIs in the blob's vois[] array. By virtue of struct voi being a
* power of 2 size, we can shift instead of divide. The shift amount must be
* updated if sizeof(struct voi) ever changes, which the assert should catch.
*/
#define NVOIS(sb) ((int32_t)((((struct statsblobv1 *)(sb))->stats_off - \
sizeof(struct statsblobv1)) >> 3))
_Static_assert(sizeof(struct voi) == 8, "statsblobv1 voi ABI mismatch");
/* Try restrict names to alphanumeric and underscore to simplify JSON compat. */
const char *vs_stype2name[VS_NUM_STYPES] = {
[VS_STYPE_VOISTATE] = "VOISTATE",
[VS_STYPE_SUM] = "SUM",
[VS_STYPE_MAX] = "MAX",
[VS_STYPE_MIN] = "MIN",
[VS_STYPE_HIST] = "HIST",
[VS_STYPE_TDGST] = "TDGST",
};
const char *vs_stype2desc[VS_NUM_STYPES] = {
[VS_STYPE_VOISTATE] = "VOI related state data (not a real stat)",
[VS_STYPE_SUM] = "Simple arithmetic accumulator",
[VS_STYPE_MAX] = "Maximum observed VOI value",
[VS_STYPE_MIN] = "Minimum observed VOI value",
[VS_STYPE_HIST] = "Histogram of observed VOI values",
[VS_STYPE_TDGST] = "t-digest of observed VOI values",
};
const char *vsd_dtype2name[VSD_NUM_DTYPES] = {
[VSD_DTYPE_VOISTATE] = "VOISTATE",
[VSD_DTYPE_INT_S32] = "INT_S32",
[VSD_DTYPE_INT_U32] = "INT_U32",
[VSD_DTYPE_INT_S64] = "INT_S64",
[VSD_DTYPE_INT_U64] = "INT_U64",
[VSD_DTYPE_INT_SLONG] = "INT_SLONG",
[VSD_DTYPE_INT_ULONG] = "INT_ULONG",
[VSD_DTYPE_Q_S32] = "Q_S32",
[VSD_DTYPE_Q_U32] = "Q_U32",
[VSD_DTYPE_Q_S64] = "Q_S64",
[VSD_DTYPE_Q_U64] = "Q_U64",
[VSD_DTYPE_CRHIST32] = "CRHIST32",
[VSD_DTYPE_DRHIST32] = "DRHIST32",
[VSD_DTYPE_DVHIST32] = "DVHIST32",
[VSD_DTYPE_CRHIST64] = "CRHIST64",
[VSD_DTYPE_DRHIST64] = "DRHIST64",
[VSD_DTYPE_DVHIST64] = "DVHIST64",
[VSD_DTYPE_TDGSTCLUST32] = "TDGSTCLUST32",
[VSD_DTYPE_TDGSTCLUST64] = "TDGSTCLUST64",
};
const size_t vsd_dtype2size[VSD_NUM_DTYPES] = {
[VSD_DTYPE_VOISTATE] = sizeof(struct voistatdata_voistate),
[VSD_DTYPE_INT_S32] = sizeof(struct voistatdata_int32),
[VSD_DTYPE_INT_U32] = sizeof(struct voistatdata_int32),
[VSD_DTYPE_INT_S64] = sizeof(struct voistatdata_int64),
[VSD_DTYPE_INT_U64] = sizeof(struct voistatdata_int64),
[VSD_DTYPE_INT_SLONG] = sizeof(struct voistatdata_intlong),
[VSD_DTYPE_INT_ULONG] = sizeof(struct voistatdata_intlong),
[VSD_DTYPE_Q_S32] = sizeof(struct voistatdata_q32),
[VSD_DTYPE_Q_U32] = sizeof(struct voistatdata_q32),
[VSD_DTYPE_Q_S64] = sizeof(struct voistatdata_q64),
[VSD_DTYPE_Q_U64] = sizeof(struct voistatdata_q64),
[VSD_DTYPE_CRHIST32] = sizeof(struct voistatdata_crhist32),
[VSD_DTYPE_DRHIST32] = sizeof(struct voistatdata_drhist32),
[VSD_DTYPE_DVHIST32] = sizeof(struct voistatdata_dvhist32),
[VSD_DTYPE_CRHIST64] = sizeof(struct voistatdata_crhist64),
[VSD_DTYPE_DRHIST64] = sizeof(struct voistatdata_drhist64),
[VSD_DTYPE_DVHIST64] = sizeof(struct voistatdata_dvhist64),
[VSD_DTYPE_TDGSTCLUST32] = sizeof(struct voistatdata_tdgstclust32),
[VSD_DTYPE_TDGSTCLUST64] = sizeof(struct voistatdata_tdgstclust64),
};
static const bool vsd_compoundtype[VSD_NUM_DTYPES] = {
[VSD_DTYPE_VOISTATE] = true,
[VSD_DTYPE_INT_S32] = false,
[VSD_DTYPE_INT_U32] = false,
[VSD_DTYPE_INT_S64] = false,
[VSD_DTYPE_INT_U64] = false,
[VSD_DTYPE_INT_SLONG] = false,
[VSD_DTYPE_INT_ULONG] = false,
[VSD_DTYPE_Q_S32] = false,
[VSD_DTYPE_Q_U32] = false,
[VSD_DTYPE_Q_S64] = false,
[VSD_DTYPE_Q_U64] = false,
[VSD_DTYPE_CRHIST32] = true,
[VSD_DTYPE_DRHIST32] = true,
[VSD_DTYPE_DVHIST32] = true,
[VSD_DTYPE_CRHIST64] = true,
[VSD_DTYPE_DRHIST64] = true,
[VSD_DTYPE_DVHIST64] = true,
[VSD_DTYPE_TDGSTCLUST32] = true,
[VSD_DTYPE_TDGSTCLUST64] = true,
};
const struct voistatdata_numeric numeric_limits[2][VSD_DTYPE_Q_U64 + 1] = {
[LIM_MIN] = {
[VSD_DTYPE_VOISTATE] = {0},
[VSD_DTYPE_INT_S32] = {.int32 = {.s32 = INT32_MIN}},
[VSD_DTYPE_INT_U32] = {.int32 = {.u32 = 0}},
[VSD_DTYPE_INT_S64] = {.int64 = {.s64 = INT64_MIN}},
[VSD_DTYPE_INT_U64] = {.int64 = {.u64 = 0}},
[VSD_DTYPE_INT_SLONG] = {.intlong = {.slong = LONG_MIN}},
[VSD_DTYPE_INT_ULONG] = {.intlong = {.ulong = 0}},
[VSD_DTYPE_Q_S32] = {.q32 = {.sq32 = Q_IFMINVAL(INT32_MIN)}},
[VSD_DTYPE_Q_U32] = {.q32 = {.uq32 = 0}},
[VSD_DTYPE_Q_S64] = {.q64 = {.sq64 = Q_IFMINVAL(INT64_MIN)}},
[VSD_DTYPE_Q_U64] = {.q64 = {.uq64 = 0}},
},
[LIM_MAX] = {
[VSD_DTYPE_VOISTATE] = {0},
[VSD_DTYPE_INT_S32] = {.int32 = {.s32 = INT32_MAX}},
[VSD_DTYPE_INT_U32] = {.int32 = {.u32 = UINT32_MAX}},
[VSD_DTYPE_INT_S64] = {.int64 = {.s64 = INT64_MAX}},
[VSD_DTYPE_INT_U64] = {.int64 = {.u64 = UINT64_MAX}},
[VSD_DTYPE_INT_SLONG] = {.intlong = {.slong = LONG_MAX}},
[VSD_DTYPE_INT_ULONG] = {.intlong = {.ulong = ULONG_MAX}},
[VSD_DTYPE_Q_S32] = {.q32 = {.sq32 = Q_IFMAXVAL(INT32_MAX)}},
[VSD_DTYPE_Q_U32] = {.q32 = {.uq32 = Q_IFMAXVAL(UINT32_MAX)}},
[VSD_DTYPE_Q_S64] = {.q64 = {.sq64 = Q_IFMAXVAL(INT64_MAX)}},
[VSD_DTYPE_Q_U64] = {.q64 = {.uq64 = Q_IFMAXVAL(UINT64_MAX)}},
}
};
/* tpllistlock protects tpllist and ntpl */
static uint32_t ntpl;
static struct statsblob_tpl **tpllist;
static inline void * stats_realloc(void *ptr, size_t oldsz, size_t newsz,
int flags);
//static void stats_v1_blob_finalise(struct statsblobv1 *sb);
static int stats_v1_blob_init_locked(struct statsblobv1 *sb, uint32_t tpl_id,
uint32_t flags);
static int stats_v1_blob_expand(struct statsblobv1 **sbpp, int newvoibytes,
int newvoistatbytes, int newvoistatdatabytes);
static void stats_v1_blob_iter(struct statsblobv1 *sb,
stats_v1_blob_itercb_t icb, void *usrctx, uint32_t flags);
static inline int stats_v1_vsd_tdgst_add(enum vsd_dtype vs_dtype,
struct voistatdata_tdgst *tdgst, s64q_t x, uint64_t weight, int attempt);
static inline int
ctd32cmp(const struct voistatdata_tdgstctd32 *c1, const struct voistatdata_tdgstctd32 *c2)
{
KASSERT(Q_PRECEQ(c1->mu, c2->mu),
("%s: Q_RELPREC(c1->mu,c2->mu)=%d", __func__,
Q_RELPREC(c1->mu, c2->mu)));
return (Q_QLTQ(c1->mu, c2->mu) ? -1 : 1);
}
ARB_GENERATE_STATIC(ctdth32, voistatdata_tdgstctd32, ctdlnk, ctd32cmp);
static inline int
ctd64cmp(const struct voistatdata_tdgstctd64 *c1, const struct voistatdata_tdgstctd64 *c2)
{
KASSERT(Q_PRECEQ(c1->mu, c2->mu),
("%s: Q_RELPREC(c1->mu,c2->mu)=%d", __func__,
Q_RELPREC(c1->mu, c2->mu)));
return (Q_QLTQ(c1->mu, c2->mu) ? -1 : 1);
}
ARB_GENERATE_STATIC(ctdth64, voistatdata_tdgstctd64, ctdlnk, ctd64cmp);
#ifdef DIAGNOSTIC
RB_GENERATE_STATIC(rbctdth32, voistatdata_tdgstctd32, rblnk, ctd32cmp);
RB_GENERATE_STATIC(rbctdth64, voistatdata_tdgstctd64, rblnk, ctd64cmp);
#endif
static inline sbintime_t
stats_sbinuptime(void)
{
sbintime_t sbt;
#ifdef _KERNEL
sbt = sbinuptime();
#else /* ! _KERNEL */
struct timespec tp;
clock_gettime(CLOCK_MONOTONIC_FAST, &tp);
sbt = tstosbt(tp);
#endif /* _KERNEL */
return (sbt);
}
static inline void *
stats_realloc(void *ptr, size_t oldsz, size_t newsz, int flags)
{
#ifdef _KERNEL
/* Default to M_NOWAIT if neither M_NOWAIT or M_WAITOK are set. */
if (!(flags & (M_WAITOK | M_NOWAIT)))
flags |= M_NOWAIT;
ptr = realloc(ptr, newsz, M_STATS, flags);
#else /* ! _KERNEL */
ptr = realloc(ptr, newsz);
if ((flags & M_ZERO) && ptr != NULL) {
if (oldsz == 0)
memset(ptr, '\0', newsz);
else if (newsz > oldsz)
memset(BLOB_OFFSET(ptr, oldsz), '\0', newsz - oldsz);
}
#endif /* _KERNEL */
return (ptr);
}
static inline char *
stats_strdup(const char *s,
#ifdef _KERNEL
int flags)
{
char *copy;
size_t len;
if (!(flags & (M_WAITOK | M_NOWAIT)))
flags |= M_NOWAIT;
len = strlen(s) + 1;
if ((copy = malloc(len, M_STATS, flags)) != NULL)
bcopy(s, copy, len);
return (copy);
#else
int flags __unused)
{
return (strdup(s));
#endif
}
static inline void
stats_tpl_update_hash(struct statsblob_tpl *tpl)
{
TPL_LIST_WLOCK_ASSERT();
tpl->mb->tplhash = hash32_str(tpl->mb->tplname, 0);
for (int voi_id = 0; voi_id < NVOIS(tpl->sb); voi_id++) {
if (tpl->mb->voi_meta[voi_id].name != NULL)
tpl->mb->tplhash = hash32_str(
tpl->mb->voi_meta[voi_id].name, tpl->mb->tplhash);
}
tpl->mb->tplhash = hash32_buf(tpl->sb, tpl->sb->cursz,
tpl->mb->tplhash);
}
static inline uint64_t
stats_pow_u64(uint64_t base, uint64_t exp)
{
uint64_t result = 1;
while (exp) {
if (exp & 1)
result *= base;
exp >>= 1;
base *= base;
}
return (result);
}
static inline int
stats_vss_hist_bkt_hlpr(struct vss_hist_hlpr_info *info, uint32_t curbkt,
struct voistatdata_numeric *bkt_lb, struct voistatdata_numeric *bkt_ub)
{
uint64_t step = 0;
int error = 0;
switch (info->scheme) {
case BKT_LIN:
step = info->lin.stepinc;
break;
case BKT_EXP:
step = stats_pow_u64(info->exp.stepbase,
info->exp.stepexp + curbkt);
break;
case BKT_LINEXP:
{
uint64_t curstepexp = 1;
switch (info->voi_dtype) {
case VSD_DTYPE_INT_S32:
while ((int32_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= bkt_lb->int32.s32)
curstepexp++;
break;
case VSD_DTYPE_INT_U32:
while ((uint32_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= bkt_lb->int32.u32)
curstepexp++;
break;
case VSD_DTYPE_INT_S64:
while ((int64_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= bkt_lb->int64.s64)
curstepexp++;
break;
case VSD_DTYPE_INT_U64:
while ((uint64_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= bkt_lb->int64.u64)
curstepexp++;
break;
case VSD_DTYPE_INT_SLONG:
while ((long)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= bkt_lb->intlong.slong)
curstepexp++;
break;
case VSD_DTYPE_INT_ULONG:
while ((unsigned long)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= bkt_lb->intlong.ulong)
curstepexp++;
break;
case VSD_DTYPE_Q_S32:
while ((s32q_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= Q_GIVAL(bkt_lb->q32.sq32))
break;
case VSD_DTYPE_Q_U32:
while ((u32q_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= Q_GIVAL(bkt_lb->q32.uq32))
break;
case VSD_DTYPE_Q_S64:
while ((s64q_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= Q_GIVAL(bkt_lb->q64.sq64))
curstepexp++;
break;
case VSD_DTYPE_Q_U64:
while ((u64q_t)stats_pow_u64(info->linexp.stepbase,
curstepexp) <= Q_GIVAL(bkt_lb->q64.uq64))
curstepexp++;
break;
default:
break;
}
step = stats_pow_u64(info->linexp.stepbase, curstepexp) /
info->linexp.linstepdiv;
if (step == 0)
step = 1;
break;
}
default:
break;
}
if (info->scheme == BKT_USR) {
*bkt_lb = info->usr.bkts[curbkt].lb;
*bkt_ub = info->usr.bkts[curbkt].ub;
} else if (step != 0) {
switch (info->voi_dtype) {
case VSD_DTYPE_INT_S32:
bkt_ub->int32.s32 += (int32_t)step;
break;
case VSD_DTYPE_INT_U32:
bkt_ub->int32.u32 += (uint32_t)step;
break;
case VSD_DTYPE_INT_S64:
bkt_ub->int64.s64 += (int64_t)step;
break;
case VSD_DTYPE_INT_U64:
bkt_ub->int64.u64 += (uint64_t)step;
break;
case VSD_DTYPE_INT_SLONG:
bkt_ub->intlong.slong += (long)step;
break;
case VSD_DTYPE_INT_ULONG:
bkt_ub->intlong.ulong += (unsigned long)step;
break;
case VSD_DTYPE_Q_S32:
error = Q_QADDI(&bkt_ub->q32.sq32, step);
break;
case VSD_DTYPE_Q_U32:
error = Q_QADDI(&bkt_ub->q32.uq32, step);
break;
case VSD_DTYPE_Q_S64:
error = Q_QADDI(&bkt_ub->q64.sq64, step);
break;
case VSD_DTYPE_Q_U64:
error = Q_QADDI(&bkt_ub->q64.uq64, step);
break;
default:
break;
}
} else { /* info->scheme != BKT_USR && step == 0 */
return (EINVAL);
}
return (error);
}
static uint32_t
stats_vss_hist_nbkts_hlpr(struct vss_hist_hlpr_info *info)
{
struct voistatdata_numeric bkt_lb, bkt_ub;
uint32_t nbkts;
int done;
if (info->scheme == BKT_USR) {
/* XXXLAS: Setting info->{lb,ub} from macro is tricky. */
info->lb = info->usr.bkts[0].lb;
info->ub = info->usr.bkts[info->usr.nbkts - 1].lb;
}
nbkts = 0;
done = 0;
bkt_ub = info->lb;
do {
bkt_lb = bkt_ub;
if (stats_vss_hist_bkt_hlpr(info, nbkts++, &bkt_lb, &bkt_ub))
return (0);
if (info->scheme == BKT_USR)
done = (nbkts == info->usr.nbkts);
else {
switch (info->voi_dtype) {
case VSD_DTYPE_INT_S32:
done = (bkt_ub.int32.s32 > info->ub.int32.s32);
break;
case VSD_DTYPE_INT_U32:
done = (bkt_ub.int32.u32 > info->ub.int32.u32);
break;
case VSD_DTYPE_INT_S64:
done = (bkt_ub.int64.s64 > info->ub.int64.s64);
break;
case VSD_DTYPE_INT_U64:
done = (bkt_ub.int64.u64 > info->ub.int64.u64);
break;
case VSD_DTYPE_INT_SLONG:
done = (bkt_ub.intlong.slong >
info->ub.intlong.slong);
break;
case VSD_DTYPE_INT_ULONG:
done = (bkt_ub.intlong.ulong >
info->ub.intlong.ulong);
break;
case VSD_DTYPE_Q_S32:
done = Q_QGTQ(bkt_ub.q32.sq32,
info->ub.q32.sq32);
break;
case VSD_DTYPE_Q_U32:
done = Q_QGTQ(bkt_ub.q32.uq32,
info->ub.q32.uq32);
break;
case VSD_DTYPE_Q_S64:
done = Q_QGTQ(bkt_ub.q64.sq64,
info->ub.q64.sq64);
break;
case VSD_DTYPE_Q_U64:
done = Q_QGTQ(bkt_ub.q64.uq64,
info->ub.q64.uq64);
break;
default:
return (0);
}
}
} while (!done);
if (info->flags & VSD_HIST_LBOUND_INF)
nbkts++;
if (info->flags & VSD_HIST_UBOUND_INF)
nbkts++;
return (nbkts);
}
int
stats_vss_hist_hlpr(enum vsd_dtype voi_dtype, struct voistatspec *vss,
struct vss_hist_hlpr_info *info)
{
struct voistatdata_hist *hist;
struct voistatdata_numeric bkt_lb, bkt_ub, *lbinfbktlb, *lbinfbktub,
*ubinfbktlb, *ubinfbktub;
uint32_t bkt, nbkts, nloop;
if (vss == NULL || info == NULL || (info->flags &
(VSD_HIST_LBOUND_INF|VSD_HIST_UBOUND_INF) && (info->hist_dtype ==
VSD_DTYPE_DVHIST32 || info->hist_dtype == VSD_DTYPE_DVHIST64)))
return (EINVAL);
info->voi_dtype = voi_dtype;
if ((nbkts = stats_vss_hist_nbkts_hlpr(info)) == 0)
return (EINVAL);
switch (info->hist_dtype) {
case VSD_DTYPE_CRHIST32:
vss->vsdsz = HIST_NBKTS2VSDSZ(crhist32, nbkts);
break;
case VSD_DTYPE_DRHIST32:
vss->vsdsz = HIST_NBKTS2VSDSZ(drhist32, nbkts);
break;
case VSD_DTYPE_DVHIST32:
vss->vsdsz = HIST_NBKTS2VSDSZ(dvhist32, nbkts);
break;
case VSD_DTYPE_CRHIST64:
vss->vsdsz = HIST_NBKTS2VSDSZ(crhist64, nbkts);
break;
case VSD_DTYPE_DRHIST64:
vss->vsdsz = HIST_NBKTS2VSDSZ(drhist64, nbkts);
break;
case VSD_DTYPE_DVHIST64:
vss->vsdsz = HIST_NBKTS2VSDSZ(dvhist64, nbkts);
break;
default:
return (EINVAL);
}
vss->iv = stats_realloc(NULL, 0, vss->vsdsz, M_ZERO);
if (vss->iv == NULL)
return (ENOMEM);
hist = (struct voistatdata_hist *)vss->iv;
bkt_ub = info->lb;
for (bkt = (info->flags & VSD_HIST_LBOUND_INF), nloop = 0;
bkt < nbkts;
bkt++, nloop++) {
bkt_lb = bkt_ub;
if (stats_vss_hist_bkt_hlpr(info, nloop, &bkt_lb, &bkt_ub))
return (EINVAL);
switch (info->hist_dtype) {
case VSD_DTYPE_CRHIST32:
VSD(crhist32, hist)->bkts[bkt].lb = bkt_lb;
break;
case VSD_DTYPE_DRHIST32:
VSD(drhist32, hist)->bkts[bkt].lb = bkt_lb;
VSD(drhist32, hist)->bkts[bkt].ub = bkt_ub;
break;
case VSD_DTYPE_DVHIST32:
VSD(dvhist32, hist)->bkts[bkt].val = bkt_lb;
break;
case VSD_DTYPE_CRHIST64:
VSD(crhist64, hist)->bkts[bkt].lb = bkt_lb;
break;
case VSD_DTYPE_DRHIST64:
VSD(drhist64, hist)->bkts[bkt].lb = bkt_lb;
VSD(drhist64, hist)->bkts[bkt].ub = bkt_ub;
break;
case VSD_DTYPE_DVHIST64:
VSD(dvhist64, hist)->bkts[bkt].val = bkt_lb;
break;
default:
return (EINVAL);
}
}
lbinfbktlb = lbinfbktub = ubinfbktlb = ubinfbktub = NULL;
switch (info->hist_dtype) {
case VSD_DTYPE_CRHIST32:
lbinfbktlb = &VSD(crhist32, hist)->bkts[0].lb;
ubinfbktlb = &VSD(crhist32, hist)->bkts[nbkts - 1].lb;
break;
case VSD_DTYPE_DRHIST32:
lbinfbktlb = &VSD(drhist32, hist)->bkts[0].lb;
lbinfbktub = &VSD(drhist32, hist)->bkts[0].ub;
ubinfbktlb = &VSD(drhist32, hist)->bkts[nbkts - 1].lb;
ubinfbktub = &VSD(drhist32, hist)->bkts[nbkts - 1].ub;
break;
case VSD_DTYPE_CRHIST64:
lbinfbktlb = &VSD(crhist64, hist)->bkts[0].lb;
ubinfbktlb = &VSD(crhist64, hist)->bkts[nbkts - 1].lb;
break;
case VSD_DTYPE_DRHIST64:
lbinfbktlb = &VSD(drhist64, hist)->bkts[0].lb;
lbinfbktub = &VSD(drhist64, hist)->bkts[0].ub;
ubinfbktlb = &VSD(drhist64, hist)->bkts[nbkts - 1].lb;
ubinfbktub = &VSD(drhist64, hist)->bkts[nbkts - 1].ub;
break;
case VSD_DTYPE_DVHIST32:
case VSD_DTYPE_DVHIST64:
break;
default:
return (EINVAL);
}
if ((info->flags & VSD_HIST_LBOUND_INF) && lbinfbktlb) {
*lbinfbktlb = numeric_limits[LIM_MIN][info->voi_dtype];
/*
* Assignment from numeric_limit array for Q types assigns max
* possible integral/fractional value for underlying data type,
* but we must set control bits for this specific histogram per
* the user's choice of fractional bits, which we extract from
* info->lb.
*/
if (info->voi_dtype == VSD_DTYPE_Q_S32 ||
info->voi_dtype == VSD_DTYPE_Q_U32) {
/* Signedness doesn't matter for setting control bits. */
Q_SCVAL(lbinfbktlb->q32.sq32,
Q_GCVAL(info->lb.q32.sq32));
} else if (info->voi_dtype == VSD_DTYPE_Q_S64 ||
info->voi_dtype == VSD_DTYPE_Q_U64) {
/* Signedness doesn't matter for setting control bits. */
Q_SCVAL(lbinfbktlb->q64.sq64,
Q_GCVAL(info->lb.q64.sq64));
}
if (lbinfbktub)
*lbinfbktub = info->lb;
}
if ((info->flags & VSD_HIST_UBOUND_INF) && ubinfbktlb) {
*ubinfbktlb = bkt_lb;
if (ubinfbktub) {
*ubinfbktub = numeric_limits[LIM_MAX][info->voi_dtype];
if (info->voi_dtype == VSD_DTYPE_Q_S32 ||
info->voi_dtype == VSD_DTYPE_Q_U32) {
Q_SCVAL(ubinfbktub->q32.sq32,
Q_GCVAL(info->lb.q32.sq32));
} else if (info->voi_dtype == VSD_DTYPE_Q_S64 ||
info->voi_dtype == VSD_DTYPE_Q_U64) {
Q_SCVAL(ubinfbktub->q64.sq64,
Q_GCVAL(info->lb.q64.sq64));
}
}
}
return (0);
}
int
stats_vss_tdgst_hlpr(enum vsd_dtype voi_dtype, struct voistatspec *vss,
struct vss_tdgst_hlpr_info *info)
{
struct voistatdata_tdgst *tdgst;
struct ctdth32 *ctd32tree;
struct ctdth64 *ctd64tree;
struct voistatdata_tdgstctd32 *ctd32;
struct voistatdata_tdgstctd64 *ctd64;
info->voi_dtype = voi_dtype;
switch (info->tdgst_dtype) {
case VSD_DTYPE_TDGSTCLUST32:
vss->vsdsz = TDGST_NCTRS2VSDSZ(tdgstclust32, info->nctds);
break;
case VSD_DTYPE_TDGSTCLUST64:
vss->vsdsz = TDGST_NCTRS2VSDSZ(tdgstclust64, info->nctds);
break;
default:
return (EINVAL);
}
vss->iv = stats_realloc(NULL, 0, vss->vsdsz, M_ZERO);
if (vss->iv == NULL)
return (ENOMEM);
tdgst = (struct voistatdata_tdgst *)vss->iv;
switch (info->tdgst_dtype) {
case VSD_DTYPE_TDGSTCLUST32:
ctd32tree = &VSD(tdgstclust32, tdgst)->ctdtree;
ARB_INIT(ctd32, ctdlnk, ctd32tree, info->nctds) {
Q_INI(&ctd32->mu, 0, 0, info->prec);
}
break;
case VSD_DTYPE_TDGSTCLUST64:
ctd64tree = &VSD(tdgstclust64, tdgst)->ctdtree;
ARB_INIT(ctd64, ctdlnk, ctd64tree, info->nctds) {
Q_INI(&ctd64->mu, 0, 0, info->prec);
}
break;
default:
return (EINVAL);
}
return (0);
}
int
stats_vss_numeric_hlpr(enum vsd_dtype voi_dtype, struct voistatspec *vss,
struct vss_numeric_hlpr_info *info)
{
struct voistatdata_numeric iv;
switch (vss->stype) {
case VS_STYPE_SUM:
iv = stats_ctor_vsd_numeric(0);
break;
case VS_STYPE_MIN:
iv = numeric_limits[LIM_MAX][voi_dtype];
break;
case VS_STYPE_MAX:
iv = numeric_limits[LIM_MIN][voi_dtype];
break;
default:
return (EINVAL);
}
vss->iv = stats_realloc(NULL, 0, vsd_dtype2size[voi_dtype], 0);
if (vss->iv == NULL)
return (ENOMEM);
vss->vs_dtype = voi_dtype;
vss->vsdsz = vsd_dtype2size[voi_dtype];
switch (voi_dtype) {
case VSD_DTYPE_INT_S32:
*((int32_t *)vss->iv) = iv.int32.s32;
break;
case VSD_DTYPE_INT_U32:
*((uint32_t *)vss->iv) = iv.int32.u32;
break;
case VSD_DTYPE_INT_S64:
*((int64_t *)vss->iv) = iv.int64.s64;
break;
case VSD_DTYPE_INT_U64:
*((uint64_t *)vss->iv) = iv.int64.u64;
break;
case VSD_DTYPE_INT_SLONG:
*((long *)vss->iv) = iv.intlong.slong;
break;
case VSD_DTYPE_INT_ULONG:
*((unsigned long *)vss->iv) = iv.intlong.ulong;
break;
case VSD_DTYPE_Q_S32:
*((s32q_t *)vss->iv) = Q_SCVAL(iv.q32.sq32,
Q_CTRLINI(info->prec));
break;
case VSD_DTYPE_Q_U32:
*((u32q_t *)vss->iv) = Q_SCVAL(iv.q32.uq32,
Q_CTRLINI(info->prec));
break;
case VSD_DTYPE_Q_S64:
*((s64q_t *)vss->iv) = Q_SCVAL(iv.q64.sq64,
Q_CTRLINI(info->prec));
break;
case VSD_DTYPE_Q_U64:
*((u64q_t *)vss->iv) = Q_SCVAL(iv.q64.uq64,
Q_CTRLINI(info->prec));
break;
default:
break;
}
return (0);
}
int
stats_vss_hlpr_init(enum vsd_dtype voi_dtype, uint32_t nvss,
struct voistatspec *vss)
{
int i, ret;
for (i = nvss - 1; i >= 0; i--) {
if (vss[i].hlpr && (ret = vss[i].hlpr(voi_dtype, &vss[i],
vss[i].hlprinfo)) != 0)
return (ret);
}
return (0);
}
void
stats_vss_hlpr_cleanup(uint32_t nvss, struct voistatspec *vss)
{
int i;
for (i = nvss - 1; i >= 0; i--) {
if (vss[i].hlpr) {
stats_free((void *)vss[i].iv);
vss[i].iv = NULL;
}
}
}
int
stats_tpl_fetch(int tpl_id, struct statsblob_tpl **tpl)
{
int error;
error = 0;
TPL_LIST_WLOCK();
if (tpl_id < 0 || tpl_id >= (int)ntpl) {
error = ENOENT;
} else {
*tpl = tpllist[tpl_id];
/* XXXLAS: Acquire refcount on tpl. */
}
TPL_LIST_WUNLOCK();
return (error);
}
int
stats_tpl_fetch_allocid(const char *name, uint32_t hash)
{
int i, tpl_id;
tpl_id = -ESRCH;
TPL_LIST_RLOCK();
for (i = ntpl - 1; i >= 0; i--) {
if (name != NULL) {
if (strlen(name) == strlen(tpllist[i]->mb->tplname) &&
strncmp(name, tpllist[i]->mb->tplname,
TPL_MAX_NAME_LEN) == 0 && (!hash || hash ==
tpllist[i]->mb->tplhash)) {
tpl_id = i;
break;
}
} else if (hash == tpllist[i]->mb->tplhash) {
tpl_id = i;
break;
}
}
TPL_LIST_RUNLOCK();
return (tpl_id);
}
int
stats_tpl_id2name(uint32_t tpl_id, char *buf, size_t len)
{
int error;
error = 0;
TPL_LIST_RLOCK();
if (tpl_id < ntpl) {
if (buf != NULL && len > strlen(tpllist[tpl_id]->mb->tplname))
strlcpy(buf, tpllist[tpl_id]->mb->tplname, len);
else
error = EOVERFLOW;
} else
error = ENOENT;
TPL_LIST_RUNLOCK();
return (error);
}
int
stats_tpl_sample_rollthedice(struct stats_tpl_sample_rate *rates, int nrates,
void *seed_bytes, size_t seed_len)
{
uint32_t cum_pct, rnd_pct;
int i;
cum_pct = 0;
/*
* Choose a pseudorandom or seeded number in range [0,100] and use
* it to make a sampling decision and template selection where required.
* If no seed is supplied, a PRNG is used to generate a pseudorandom
* number so that every selection is independent. If a seed is supplied,
* the caller desires random selection across different seeds, but
* deterministic selection given the same seed. This is achieved by
* hashing the seed and using the hash as the random number source.
*
* XXXLAS: Characterise hash function output distribution.
*/
if (seed_bytes == NULL)
rnd_pct = random() / (INT32_MAX / 100);
else
rnd_pct = hash32_buf(seed_bytes, seed_len, 0) /
(UINT32_MAX / 100U);
/*
* We map the randomly selected percentage on to the interval [0,100]
* consisting of the cumulatively summed template sampling percentages.
* The difference between the cumulative sum of all template sampling
* percentages and 100 is treated as a NULL assignment i.e. no stats
* template will be assigned, and -1 returned instead.
*/
for (i = 0; i < nrates; i++) {
cum_pct += rates[i].tpl_sample_pct;
KASSERT(cum_pct <= 100, ("%s cum_pct %u > 100", __func__,
cum_pct));
if (rnd_pct > cum_pct || rates[i].tpl_sample_pct == 0)
continue;
return (rates[i].tpl_slot_id);
}
return (-1);
}
int
stats_v1_blob_clone(struct statsblobv1 **dst, size_t dstmaxsz,
struct statsblobv1 *src, uint32_t flags)
{
int error;
error = 0;
if (src == NULL || dst == NULL ||
src->cursz < sizeof(struct statsblob) ||
((flags & SB_CLONE_ALLOCDST) &&
(flags & (SB_CLONE_USRDSTNOFAULT | SB_CLONE_USRDST)))) {
error = EINVAL;
} else if (flags & SB_CLONE_ALLOCDST) {
*dst = stats_realloc(NULL, 0, src->cursz, 0);
if (*dst)
(*dst)->maxsz = dstmaxsz = src->cursz;
else
error = ENOMEM;
} else if (*dst == NULL || dstmaxsz < sizeof(struct statsblob)) {
error = EINVAL;
}
if (!error) {
size_t postcurszlen;
/*
* Clone src into dst except for the maxsz field. If dst is too
* small to hold all of src, only copy src's header and return
* EOVERFLOW.
*/
#ifdef _KERNEL
if (flags & SB_CLONE_USRDSTNOFAULT)
copyout_nofault(src, *dst,
offsetof(struct statsblob, maxsz));
else if (flags & SB_CLONE_USRDST)
copyout(src, *dst, offsetof(struct statsblob, maxsz));
else
#endif
memcpy(*dst, src, offsetof(struct statsblob, maxsz));
if (dstmaxsz >= src->cursz) {
postcurszlen = src->cursz -
offsetof(struct statsblob, cursz);
} else {
error = EOVERFLOW;
postcurszlen = sizeof(struct statsblob) -
offsetof(struct statsblob, cursz);
}
#ifdef _KERNEL
if (flags & SB_CLONE_USRDSTNOFAULT)
copyout_nofault(&(src->cursz), &((*dst)->cursz),
postcurszlen);
else if (flags & SB_CLONE_USRDST)
copyout(&(src->cursz), &((*dst)->cursz), postcurszlen);
else
#endif
memcpy(&((*dst)->cursz), &(src->cursz), postcurszlen);
}
return (error);
}
int
stats_v1_tpl_alloc(const char *name, uint32_t flags __unused)
{
struct statsblobv1_tpl *tpl, **newtpllist;
struct statsblobv1 *tpl_sb;
struct metablob *tpl_mb;
int tpl_id;
if (name != NULL && strlen(name) > TPL_MAX_NAME_LEN)
return (-EINVAL);
if (name != NULL && stats_tpl_fetch_allocid(name, 0) >= 0)
return (-EEXIST);
tpl = stats_realloc(NULL, 0, sizeof(struct statsblobv1_tpl), M_ZERO);
tpl_mb = stats_realloc(NULL, 0, sizeof(struct metablob), M_ZERO);
tpl_sb = stats_realloc(NULL, 0, sizeof(struct statsblobv1), M_ZERO);
if (tpl_mb != NULL && name != NULL)
tpl_mb->tplname = stats_strdup(name, 0);
if (tpl == NULL || tpl_sb == NULL || tpl_mb == NULL ||
tpl_mb->tplname == NULL) {
stats_free(tpl);
stats_free(tpl_sb);
if (tpl_mb != NULL) {
stats_free(tpl_mb->tplname);
stats_free(tpl_mb);
}
return (-ENOMEM);
}
tpl->mb = tpl_mb;
tpl->sb = tpl_sb;
tpl_sb->abi = STATS_ABI_V1;
tpl_sb->endian =
#if BYTE_ORDER == LITTLE_ENDIAN
SB_LE;
#elif BYTE_ORDER == BIG_ENDIAN
SB_BE;
#else
SB_UE;
#endif
tpl_sb->cursz = tpl_sb->maxsz = sizeof(struct statsblobv1);
tpl_sb->stats_off = tpl_sb->statsdata_off = sizeof(struct statsblobv1);
TPL_LIST_WLOCK();
newtpllist = stats_realloc(tpllist, ntpl * sizeof(void *),
(ntpl + 1) * sizeof(void *), 0);
if (newtpllist != NULL) {
tpl_id = ntpl++;
tpllist = (struct statsblob_tpl **)newtpllist;
tpllist[tpl_id] = (struct statsblob_tpl *)tpl;
stats_tpl_update_hash(tpllist[tpl_id]);
} else {
stats_free(tpl);
stats_free(tpl_sb);
if (tpl_mb != NULL) {
stats_free(tpl_mb->tplname);
stats_free(tpl_mb);
}
tpl_id = -ENOMEM;
}
TPL_LIST_WUNLOCK();
return (tpl_id);
}
int
stats_v1_tpl_add_voistats(uint32_t tpl_id, int32_t voi_id, const char *voi_name,
enum vsd_dtype voi_dtype, uint32_t nvss, struct voistatspec *vss,
uint32_t flags)
{
struct voi *voi;
struct voistat *tmpstat;
struct statsblobv1 *tpl_sb;
struct metablob *tpl_mb;
int error, i, newstatdataidx, newvoibytes, newvoistatbytes,
newvoistatdatabytes, newvoistatmaxid;
uint32_t nbytes;
if (voi_id < 0 || voi_dtype == 0 || voi_dtype >= VSD_NUM_DTYPES ||
nvss == 0 || vss == NULL)
return (EINVAL);
error = nbytes = newvoibytes = newvoistatbytes =
newvoistatdatabytes = 0;
newvoistatmaxid = -1;
/* Calculate the number of bytes required for the new voistats. */
for (i = nvss - 1; i >= 0; i--) {
if (vss[i].stype == 0 || vss[i].stype >= VS_NUM_STYPES ||
vss[i].vs_dtype == 0 || vss[i].vs_dtype >= VSD_NUM_DTYPES ||
vss[i].iv == NULL || vss[i].vsdsz == 0)
return (EINVAL);
if ((int)vss[i].stype > newvoistatmaxid)
newvoistatmaxid = vss[i].stype;
newvoistatdatabytes += vss[i].vsdsz;
}
if (flags & SB_VOI_RELUPDATE) {
/* XXXLAS: VOI state bytes may need to vary based on stat types. */
newvoistatdatabytes += sizeof(struct voistatdata_voistate);
}
nbytes += newvoistatdatabytes;
TPL_LIST_WLOCK();
if (tpl_id < ntpl) {
tpl_sb = (struct statsblobv1 *)tpllist[tpl_id]->sb;
tpl_mb = tpllist[tpl_id]->mb;
if (voi_id >= NVOIS(tpl_sb) || tpl_sb->vois[voi_id].id == -1) {
/* Adding a new VOI and associated stats. */
if (voi_id >= NVOIS(tpl_sb)) {
/* We need to grow the tpl_sb->vois array. */
newvoibytes = (voi_id - (NVOIS(tpl_sb) - 1)) *
sizeof(struct voi);
nbytes += newvoibytes;
}
newvoistatbytes =
(newvoistatmaxid + 1) * sizeof(struct voistat);
} else {
/* Adding stats to an existing VOI. */
if (newvoistatmaxid >
tpl_sb->vois[voi_id].voistatmaxid) {
newvoistatbytes = (newvoistatmaxid -
tpl_sb->vois[voi_id].voistatmaxid) *
sizeof(struct voistat);
}
/* XXXLAS: KPI does not yet support expanding VOIs. */
error = EOPNOTSUPP;
}
nbytes += newvoistatbytes;
if (!error && newvoibytes > 0) {
struct voi_meta *voi_meta = tpl_mb->voi_meta;
voi_meta = stats_realloc(voi_meta, voi_meta == NULL ?
0 : NVOIS(tpl_sb) * sizeof(struct voi_meta),
(1 + voi_id) * sizeof(struct voi_meta),
M_ZERO);
if (voi_meta == NULL)
error = ENOMEM;
else
tpl_mb->voi_meta = voi_meta;
}
if (!error) {
/* NB: Resizing can change where tpl_sb points. */
error = stats_v1_blob_expand(&tpl_sb, newvoibytes,
newvoistatbytes, newvoistatdatabytes);
}
if (!error) {
tpl_mb->voi_meta[voi_id].name = stats_strdup(voi_name,
0);
if (tpl_mb->voi_meta[voi_id].name == NULL)
error = ENOMEM;
}
if (!error) {
/* Update the template list with the resized pointer. */
tpllist[tpl_id]->sb = (struct statsblob *)tpl_sb;
/* Update the template. */
voi = &tpl_sb->vois[voi_id];
if (voi->id < 0) {
/* VOI is new and needs to be initialised. */
voi->id = voi_id;
voi->dtype = voi_dtype;
voi->stats_off = tpl_sb->stats_off;
if (flags & SB_VOI_RELUPDATE)
voi->flags |= VOI_REQSTATE;
} else {
/*
* XXXLAS: When this else block is written, the
* "KPI does not yet support expanding VOIs"
* error earlier in this function can be
* removed. What is required here is to shuffle
* the voistat array such that the new stats for
* the voi are contiguous, which will displace
* stats for other vois that reside after the
* voi being updated. The other vois then need
* to have their stats_off adjusted post
* shuffle.
*/
}
voi->voistatmaxid = newvoistatmaxid;
newstatdataidx = 0;
if (voi->flags & VOI_REQSTATE) {
/* Initialise the voistate stat in slot 0. */
tmpstat = BLOB_OFFSET(tpl_sb, voi->stats_off);
tmpstat->stype = VS_STYPE_VOISTATE;
tmpstat->flags = 0;
tmpstat->dtype = VSD_DTYPE_VOISTATE;
newstatdataidx = tmpstat->dsz =
sizeof(struct voistatdata_numeric);
tmpstat->data_off = tpl_sb->statsdata_off;
}
for (i = 0; (uint32_t)i < nvss; i++) {
tmpstat = BLOB_OFFSET(tpl_sb, voi->stats_off +
(vss[i].stype * sizeof(struct voistat)));
KASSERT(tmpstat->stype < 0, ("voistat %p "
"already initialised", tmpstat));
tmpstat->stype = vss[i].stype;
tmpstat->flags = vss[i].flags;
tmpstat->dtype = vss[i].vs_dtype;
tmpstat->dsz = vss[i].vsdsz;
tmpstat->data_off = tpl_sb->statsdata_off +
newstatdataidx;
memcpy(BLOB_OFFSET(tpl_sb, tmpstat->data_off),
vss[i].iv, vss[i].vsdsz);
newstatdataidx += vss[i].vsdsz;
}
/* Update the template version hash. */
stats_tpl_update_hash(tpllist[tpl_id]);
/* XXXLAS: Confirm tpl name/hash pair remains unique. */
}
} else
error = EINVAL;
TPL_LIST_WUNLOCK();
return (error);
}
struct statsblobv1 *
stats_v1_blob_alloc(uint32_t tpl_id, uint32_t flags __unused)
{
struct statsblobv1 *sb;
int error;
sb = NULL;
TPL_LIST_RLOCK();
if (tpl_id < ntpl) {
sb = stats_realloc(NULL, 0, tpllist[tpl_id]->sb->maxsz, 0);
if (sb != NULL) {
sb->maxsz = tpllist[tpl_id]->sb->maxsz;
error = stats_v1_blob_init_locked(sb, tpl_id, 0);
} else
error = ENOMEM;
if (error) {
stats_free(sb);
sb = NULL;
}
}
TPL_LIST_RUNLOCK();
return (sb);
}
void
stats_v1_blob_destroy(struct statsblobv1 *sb)
{
stats_free(sb);
}
int
stats_v1_voistat_fetch_dptr(struct statsblobv1 *sb, int32_t voi_id,
enum voi_stype stype, enum vsd_dtype *retdtype, struct voistatdata **retvsd,
size_t *retvsdsz)
{
struct voi *v;
struct voistat *vs;
if (retvsd == NULL || sb == NULL || sb->abi != STATS_ABI_V1 ||
voi_id >= NVOIS(sb))
return (EINVAL);
v = &sb->vois[voi_id];
if ((__typeof(v->voistatmaxid))stype > v->voistatmaxid)
return (EINVAL);
vs = BLOB_OFFSET(sb, v->stats_off + (stype * sizeof(struct voistat)));
*retvsd = BLOB_OFFSET(sb, vs->data_off);
if (retdtype != NULL)
*retdtype = vs->dtype;
if (retvsdsz != NULL)
*retvsdsz = vs->dsz;
return (0);
}
int
stats_v1_blob_init(struct statsblobv1 *sb, uint32_t tpl_id, uint32_t flags)
{
int error;
error = 0;
TPL_LIST_RLOCK();
if (sb == NULL || tpl_id >= ntpl) {
error = EINVAL;
} else {
error = stats_v1_blob_init_locked(sb, tpl_id, flags);
}
TPL_LIST_RUNLOCK();
return (error);
}
static inline int
stats_v1_blob_init_locked(struct statsblobv1 *sb, uint32_t tpl_id,
uint32_t flags __unused)
{
int error;
TPL_LIST_RLOCK_ASSERT();
error = (sb->maxsz >= tpllist[tpl_id]->sb->cursz) ? 0 : EOVERFLOW;
KASSERT(!error,
("sb %d instead of %d bytes", sb->maxsz, tpllist[tpl_id]->sb->cursz));
if (!error) {
memcpy(sb, tpllist[tpl_id]->sb, tpllist[tpl_id]->sb->cursz);
sb->created = sb->lastrst = stats_sbinuptime();
sb->tplhash = tpllist[tpl_id]->mb->tplhash;
}
return (error);
}
static int
stats_v1_blob_expand(struct statsblobv1 **sbpp, int newvoibytes,
int newvoistatbytes, int newvoistatdatabytes)
{
struct statsblobv1 *sb;
struct voi *tmpvoi;
struct voistat *tmpvoistat, *voistat_array;
int error, i, idxnewvois, idxnewvoistats, nbytes, nvoistats;
KASSERT(newvoibytes % sizeof(struct voi) == 0,
("Bad newvoibytes %d", newvoibytes));
KASSERT(newvoistatbytes % sizeof(struct voistat) == 0,
("Bad newvoistatbytes %d", newvoistatbytes));
error = ((newvoibytes % sizeof(struct voi) == 0) &&
(newvoistatbytes % sizeof(struct voistat) == 0)) ? 0 : EINVAL;
sb = *sbpp;
nbytes = newvoibytes + newvoistatbytes + newvoistatdatabytes;
/*
* XXXLAS: Required until we gain support for flags which alter the
* units of size/offset fields in key structs.
*/
if (!error && ((((int)sb->cursz) + nbytes) > SB_V1_MAXSZ))
error = EFBIG;
if (!error && (sb->cursz + nbytes > sb->maxsz)) {
/* Need to expand our blob. */
sb = stats_realloc(sb, sb->maxsz, sb->cursz + nbytes, M_ZERO);
if (sb != NULL) {
sb->maxsz = sb->cursz + nbytes;
*sbpp = sb;
} else
error = ENOMEM;
}
if (!error) {
/*
* Shuffle memory within the expanded blob working from the end
* backwards, leaving gaps for the new voistat and voistatdata
* structs at the beginning of their respective blob regions,
* and for the new voi structs at the end of their blob region.
*/
memmove(BLOB_OFFSET(sb, sb->statsdata_off + nbytes),
BLOB_OFFSET(sb, sb->statsdata_off),
sb->cursz - sb->statsdata_off);
memmove(BLOB_OFFSET(sb, sb->stats_off + newvoibytes +
newvoistatbytes), BLOB_OFFSET(sb, sb->stats_off),
sb->statsdata_off - sb->stats_off);
/* First index of new voi/voistat structs to be initialised. */
idxnewvois = NVOIS(sb);
idxnewvoistats = (newvoistatbytes / sizeof(struct voistat)) - 1;
/* Update housekeeping variables and offsets. */
sb->cursz += nbytes;
sb->stats_off += newvoibytes;
sb->statsdata_off += newvoibytes + newvoistatbytes;
/* XXXLAS: Zeroing not strictly needed but aids debugging. */
memset(&sb->vois[idxnewvois], '\0', newvoibytes);
memset(BLOB_OFFSET(sb, sb->stats_off), '\0',
newvoistatbytes);
memset(BLOB_OFFSET(sb, sb->statsdata_off), '\0',
newvoistatdatabytes);
/* Initialise new voi array members and update offsets. */
for (i = 0; i < NVOIS(sb); i++) {
tmpvoi = &sb->vois[i];
if (i >= idxnewvois) {
tmpvoi->id = tmpvoi->voistatmaxid = -1;
} else if (tmpvoi->id > -1) {
tmpvoi->stats_off += newvoibytes +
newvoistatbytes;
}
}
/* Initialise new voistat array members and update offsets. */
nvoistats = (sb->statsdata_off - sb->stats_off) /
sizeof(struct voistat);
voistat_array = BLOB_OFFSET(sb, sb->stats_off);
for (i = 0; i < nvoistats; i++) {
tmpvoistat = &voistat_array[i];
if (i <= idxnewvoistats) {
tmpvoistat->stype = -1;
} else if (tmpvoistat->stype > -1) {
tmpvoistat->data_off += nbytes;
}
}
}
return (error);
}
static void
stats_v1_blob_finalise(struct statsblobv1 *sb __unused)
{
/* XXXLAS: Fill this in. */
}
static void
stats_v1_blob_iter(struct statsblobv1 *sb, stats_v1_blob_itercb_t icb,
void *usrctx, uint32_t flags)
{
struct voi *v;
struct voistat *vs;
struct sb_iter_ctx ctx;
int i, j, firstvoi;
ctx.usrctx = usrctx;
ctx.flags = SB_IT_FIRST_CB;
firstvoi = 1;
for (i = 0; i < NVOIS(sb); i++) {
v = &sb->vois[i];
ctx.vslot = i;
ctx.vsslot = -1;
ctx.flags |= SB_IT_FIRST_VOISTAT;
if (firstvoi)
ctx.flags |= SB_IT_FIRST_VOI;
else if (i == (NVOIS(sb) - 1))
ctx.flags |= SB_IT_LAST_VOI | SB_IT_LAST_CB;
if (v->id < 0 && (flags & SB_IT_NULLVOI)) {
if (icb(sb, v, NULL, &ctx))
return;
firstvoi = 0;
ctx.flags &= ~SB_IT_FIRST_CB;
}
/* If NULL voi, v->voistatmaxid == -1 */
for (j = 0; j <= v->voistatmaxid; j++) {
vs = &((struct voistat *)BLOB_OFFSET(sb,
v->stats_off))[j];
if (vs->stype < 0 &&
!(flags & SB_IT_NULLVOISTAT))
continue;
if (j == v->voistatmaxid) {
ctx.flags |= SB_IT_LAST_VOISTAT;
if (i == (NVOIS(sb) - 1))
ctx.flags |=
SB_IT_LAST_CB;
} else
ctx.flags &= ~SB_IT_LAST_CB;
ctx.vsslot = j;
if (icb(sb, v, vs, &ctx))
return;
ctx.flags &= ~(SB_IT_FIRST_CB | SB_IT_FIRST_VOISTAT |
SB_IT_LAST_VOISTAT);
}
ctx.flags &= ~(SB_IT_FIRST_VOI | SB_IT_LAST_VOI);
}
}
static inline void
stats_voistatdata_tdgst_tostr(enum vsd_dtype voi_dtype __unused,
const struct voistatdata_tdgst *tdgst, enum vsd_dtype tdgst_dtype,
size_t tdgst_dsz __unused, enum sb_str_fmt fmt, struct sbuf *buf, int objdump)
{
const struct ctdth32 *ctd32tree;
const struct ctdth64 *ctd64tree;
const struct voistatdata_tdgstctd32 *ctd32;
const struct voistatdata_tdgstctd64 *ctd64;
const char *fmtstr;
uint64_t smplcnt, compcnt;
int is32bit, qmaxstrlen;
uint16_t maxctds, curctds;
switch (tdgst_dtype) {
case VSD_DTYPE_TDGSTCLUST32:
smplcnt = CONSTVSD(tdgstclust32, tdgst)->smplcnt;
compcnt = CONSTVSD(tdgstclust32, tdgst)->compcnt;
maxctds = ARB_MAXNODES(&CONSTVSD(tdgstclust32, tdgst)->ctdtree);
curctds = ARB_CURNODES(&CONSTVSD(tdgstclust32, tdgst)->ctdtree);
ctd32tree = &CONSTVSD(tdgstclust32, tdgst)->ctdtree;
ctd32 = (objdump ? ARB_CNODE(ctd32tree, 0) :
ARB_CMIN(ctdth32, ctd32tree));
qmaxstrlen = (ctd32 == NULL) ? 1 : Q_MAXSTRLEN(ctd32->mu, 10);
is32bit = 1;
ctd64tree = NULL;
ctd64 = NULL;
break;
case VSD_DTYPE_TDGSTCLUST64:
smplcnt = CONSTVSD(tdgstclust64, tdgst)->smplcnt;
compcnt = CONSTVSD(tdgstclust64, tdgst)->compcnt;
maxctds = ARB_MAXNODES(&CONSTVSD(tdgstclust64, tdgst)->ctdtree);
curctds = ARB_CURNODES(&CONSTVSD(tdgstclust64, tdgst)->ctdtree);
ctd64tree = &CONSTVSD(tdgstclust64, tdgst)->ctdtree;
ctd64 = (objdump ? ARB_CNODE(ctd64tree, 0) :
ARB_CMIN(ctdth64, ctd64tree));
qmaxstrlen = (ctd64 == NULL) ? 1 : Q_MAXSTRLEN(ctd64->mu, 10);
is32bit = 0;
ctd32tree = NULL;
ctd32 = NULL;
break;
default:
return;
}
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "smplcnt=%ju, compcnt=%ju, maxctds=%hu, nctds=%hu";
break;
case SB_STRFMT_JSON:
default:
fmtstr =
"\"smplcnt\":%ju,\"compcnt\":%ju,\"maxctds\":%hu,"
"\"nctds\":%hu,\"ctds\":[";
break;
}
sbuf_printf(buf, fmtstr, (uintmax_t)smplcnt, (uintmax_t)compcnt,
maxctds, curctds);
while ((is32bit ? NULL != ctd32 : NULL != ctd64)) {
char qstr[qmaxstrlen];
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "\n\t\t\t\t";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "{";
break;
}
sbuf_cat(buf, fmtstr);
if (objdump) {
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "ctd[%hu].";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "\"ctd\":%hu,";
break;
}
sbuf_printf(buf, fmtstr, is32bit ?
ARB_SELFIDX(ctd32tree, ctd32) :
ARB_SELFIDX(ctd64tree, ctd64));
}
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "{mu=";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "\"mu\":";
break;
}
sbuf_cat(buf, fmtstr);
Q_TOSTR((is32bit ? ctd32->mu : ctd64->mu), -1, 10, qstr,
sizeof(qstr));
sbuf_cat(buf, qstr);
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = is32bit ? ",cnt=%u}" : ",cnt=%ju}";
break;
case SB_STRFMT_JSON:
default:
fmtstr = is32bit ? ",\"cnt\":%u}" : ",\"cnt\":%ju}";
break;
}
sbuf_printf(buf, fmtstr,
is32bit ? ctd32->cnt : (uintmax_t)ctd64->cnt);
if (is32bit)
ctd32 = (objdump ? ARB_CNODE(ctd32tree,
ARB_SELFIDX(ctd32tree, ctd32) + 1) :
ARB_CNEXT(ctdth32, ctd32tree, ctd32));
else
ctd64 = (objdump ? ARB_CNODE(ctd64tree,
ARB_SELFIDX(ctd64tree, ctd64) + 1) :
ARB_CNEXT(ctdth64, ctd64tree, ctd64));
if (fmt == SB_STRFMT_JSON &&
(is32bit ? NULL != ctd32 : NULL != ctd64))
sbuf_putc(buf, ',');
}
if (fmt == SB_STRFMT_JSON)
sbuf_cat(buf, "]");
}
static inline void
stats_voistatdata_hist_tostr(enum vsd_dtype voi_dtype,
const struct voistatdata_hist *hist, enum vsd_dtype hist_dtype,
size_t hist_dsz, enum sb_str_fmt fmt, struct sbuf *buf, int objdump)
{
const struct voistatdata_numeric *bkt_lb, *bkt_ub;
const char *fmtstr;
int is32bit;
uint16_t i, nbkts;
switch (hist_dtype) {
case VSD_DTYPE_CRHIST32:
nbkts = HIST_VSDSZ2NBKTS(crhist32, hist_dsz);
is32bit = 1;
break;
case VSD_DTYPE_DRHIST32:
nbkts = HIST_VSDSZ2NBKTS(drhist32, hist_dsz);
is32bit = 1;
break;
case VSD_DTYPE_DVHIST32:
nbkts = HIST_VSDSZ2NBKTS(dvhist32, hist_dsz);
is32bit = 1;
break;
case VSD_DTYPE_CRHIST64:
nbkts = HIST_VSDSZ2NBKTS(crhist64, hist_dsz);
is32bit = 0;
break;
case VSD_DTYPE_DRHIST64:
nbkts = HIST_VSDSZ2NBKTS(drhist64, hist_dsz);
is32bit = 0;
break;
case VSD_DTYPE_DVHIST64:
nbkts = HIST_VSDSZ2NBKTS(dvhist64, hist_dsz);
is32bit = 0;
break;
default:
return;
}
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "nbkts=%hu, ";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "\"nbkts\":%hu,";
break;
}
sbuf_printf(buf, fmtstr, nbkts);
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = (is32bit ? "oob=%u" : "oob=%ju");
break;
case SB_STRFMT_JSON:
default:
fmtstr = (is32bit ? "\"oob\":%u,\"bkts\":[" :
"\"oob\":%ju,\"bkts\":[");
break;
}
sbuf_printf(buf, fmtstr, is32bit ? VSD_CONSTHIST_FIELDVAL(hist,
hist_dtype, oob) : (uintmax_t)VSD_CONSTHIST_FIELDVAL(hist,
hist_dtype, oob));
for (i = 0; i < nbkts; i++) {
switch (hist_dtype) {
case VSD_DTYPE_CRHIST32:
case VSD_DTYPE_CRHIST64:
bkt_lb = VSD_CONSTCRHIST_FIELDPTR(hist, hist_dtype,
bkts[i].lb);
if (i < nbkts - 1)
bkt_ub = VSD_CONSTCRHIST_FIELDPTR(hist,
hist_dtype, bkts[i + 1].lb);
else
bkt_ub = &numeric_limits[LIM_MAX][voi_dtype];
break;
case VSD_DTYPE_DRHIST32:
case VSD_DTYPE_DRHIST64:
bkt_lb = VSD_CONSTDRHIST_FIELDPTR(hist, hist_dtype,
bkts[i].lb);
bkt_ub = VSD_CONSTDRHIST_FIELDPTR(hist, hist_dtype,
bkts[i].ub);
break;
case VSD_DTYPE_DVHIST32:
case VSD_DTYPE_DVHIST64:
bkt_lb = bkt_ub = VSD_CONSTDVHIST_FIELDPTR(hist,
hist_dtype, bkts[i].val);
break;
default:
break;
}
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "\n\t\t\t\t";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "{";
break;
}
sbuf_cat(buf, fmtstr);
if (objdump) {
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "bkt[%hu].";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "\"bkt\":%hu,";
break;
}
sbuf_printf(buf, fmtstr, i);
}
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "{lb=";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "\"lb\":";
break;
}
sbuf_cat(buf, fmtstr);
stats_voistatdata_tostr((const struct voistatdata *)bkt_lb,
voi_dtype, voi_dtype, sizeof(struct voistatdata_numeric),
fmt, buf, objdump);
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = ",ub=";
break;
case SB_STRFMT_JSON:
default:
fmtstr = ",\"ub\":";
break;
}
sbuf_cat(buf, fmtstr);
stats_voistatdata_tostr((const struct voistatdata *)bkt_ub,
voi_dtype, voi_dtype, sizeof(struct voistatdata_numeric),
fmt, buf, objdump);
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = is32bit ? ",cnt=%u}" : ",cnt=%ju}";
break;
case SB_STRFMT_JSON:
default:
fmtstr = is32bit ? ",\"cnt\":%u}" : ",\"cnt\":%ju}";
break;
}
sbuf_printf(buf, fmtstr, is32bit ?
VSD_CONSTHIST_FIELDVAL(hist, hist_dtype, bkts[i].cnt) :
(uintmax_t)VSD_CONSTHIST_FIELDVAL(hist, hist_dtype,
bkts[i].cnt));
if (fmt == SB_STRFMT_JSON && i < nbkts - 1)
sbuf_putc(buf, ',');
}
if (fmt == SB_STRFMT_JSON)
sbuf_cat(buf, "]");
}
int
stats_voistatdata_tostr(const struct voistatdata *vsd, enum vsd_dtype voi_dtype,
enum vsd_dtype vsd_dtype, size_t vsd_sz, enum sb_str_fmt fmt,
struct sbuf *buf, int objdump)
{
const char *fmtstr;
if (vsd == NULL || buf == NULL || voi_dtype >= VSD_NUM_DTYPES ||
vsd_dtype >= VSD_NUM_DTYPES || fmt >= SB_STRFMT_NUM_FMTS)
return (EINVAL);
switch (vsd_dtype) {
case VSD_DTYPE_VOISTATE:
switch (fmt) {
case SB_STRFMT_FREEFORM:
fmtstr = "prev=";
break;
case SB_STRFMT_JSON:
default:
fmtstr = "\"prev\":";
break;
}
sbuf_cat(buf, fmtstr);
/*
* Render prev by passing it as *vsd and voi_dtype as vsd_dtype.
*/
stats_voistatdata_tostr(
(const struct voistatdata *)&CONSTVSD(voistate, vsd)->prev,
voi_dtype, voi_dtype, vsd_sz, fmt, buf, objdump);
break;
case VSD_DTYPE_INT_S32:
sbuf_printf(buf, "%d", vsd->int32.s32);
break;
case VSD_DTYPE_INT_U32:
sbuf_printf(buf, "%u", vsd->int32.u32);
break;
case VSD_DTYPE_INT_S64:
sbuf_printf(buf, "%jd", (intmax_t)vsd->int64.s64);
break;
case VSD_DTYPE_INT_U64:
sbuf_printf(buf, "%ju", (uintmax_t)vsd->int64.u64);
break;
case VSD_DTYPE_INT_SLONG:
sbuf_printf(buf, "%ld", vsd->intlong.slong);
break;
case VSD_DTYPE_INT_ULONG:
sbuf_printf(buf, "%lu", vsd->intlong.ulong);
break;
case VSD_DTYPE_Q_S32:
{
char qstr[Q_MAXSTRLEN(vsd->q32.sq32, 10)];
Q_TOSTR((s32q_t)vsd->q32.sq32, -1, 10, qstr, sizeof(qstr));
sbuf_cat(buf, qstr);
}
break;
case VSD_DTYPE_Q_U32:
{
char qstr[Q_MAXSTRLEN(vsd->q32.uq32, 10)];
Q_TOSTR((u32q_t)vsd->q32.uq32, -1, 10, qstr, sizeof(qstr));
sbuf_cat(buf, qstr);
}
break;
case VSD_DTYPE_Q_S64:
{
char qstr[Q_MAXSTRLEN(vsd->q64.sq64, 10)];
Q_TOSTR((s64q_t)vsd->q64.sq64, -1, 10, qstr, sizeof(qstr));
sbuf_cat(buf, qstr);
}
break;
case VSD_DTYPE_Q_U64:
{
char qstr[Q_MAXSTRLEN(vsd->q64.uq64, 10)];
Q_TOSTR((u64q_t)vsd->q64.uq64, -1, 10, qstr, sizeof(qstr));
sbuf_cat(buf, qstr);
}
break;
case VSD_DTYPE_CRHIST32:
case VSD_DTYPE_DRHIST32:
case VSD_DTYPE_DVHIST32:
case VSD_DTYPE_CRHIST64:
case VSD_DTYPE_DRHIST64:
case VSD_DTYPE_DVHIST64:
stats_voistatdata_hist_tostr(voi_dtype, CONSTVSD(hist, vsd),
vsd_dtype, vsd_sz, fmt, buf, objdump);
break;
case VSD_DTYPE_TDGSTCLUST32:
case VSD_DTYPE_TDGSTCLUST64:
stats_voistatdata_tdgst_tostr(voi_dtype,
CONSTVSD(tdgst, vsd), vsd_dtype, vsd_sz, fmt, buf,
objdump);
break;
default:
break;
}
return (sbuf_error(buf));
}
static void
stats_v1_itercb_tostr_freeform(struct statsblobv1 *sb, struct voi *v,
struct voistat *vs, struct sb_iter_ctx *ctx)
{
struct sb_tostrcb_ctx *sctx;
struct metablob *tpl_mb;
struct sbuf *buf;
void *vsd;
uint8_t dump;
sctx = ctx->usrctx;
buf = sctx->buf;
tpl_mb = sctx->tpl ? sctx->tpl->mb : NULL;
dump = ((sctx->flags & SB_TOSTR_OBJDUMP) != 0);
if (ctx->flags & SB_IT_FIRST_CB) {
sbuf_printf(buf, "struct statsblobv1@%p", sb);
if (dump) {
sbuf_printf(buf, ", abi=%hhu, endian=%hhu, maxsz=%hu, "
"cursz=%hu, created=%jd, lastrst=%jd, flags=0x%04hx, "
"stats_off=%hu, statsdata_off=%hu",
sb->abi, sb->endian, sb->maxsz, sb->cursz,
sb->created, sb->lastrst, sb->flags, sb->stats_off,
sb->statsdata_off);
}
sbuf_printf(buf, ", tplhash=%u", sb->tplhash);
}
if (ctx->flags & SB_IT_FIRST_VOISTAT) {
sbuf_printf(buf, "\n\tvois[%hd]: id=%hd", ctx->vslot, v->id);
if (v->id < 0)
return;
sbuf_printf(buf, ", name=\"%s\"", (tpl_mb == NULL) ? "" :
tpl_mb->voi_meta[v->id].name);
if (dump)
sbuf_printf(buf, ", flags=0x%04hx, dtype=%s, "
"voistatmaxid=%hhd, stats_off=%hu", v->flags,
vsd_dtype2name[v->dtype], v->voistatmaxid, v->stats_off);
}
if (!dump && vs->stype <= 0)
return;
sbuf_printf(buf, "\n\t\tvois[%hd]stat[%hhd]: stype=", v->id, ctx->vsslot);
if (vs->stype < 0) {
sbuf_printf(buf, "%hhd", vs->stype);
return;
} else
sbuf_printf(buf, "%s, errs=%hu", vs_stype2name[vs->stype],
vs->errs);
vsd = BLOB_OFFSET(sb, vs->data_off);
if (dump)
sbuf_printf(buf, ", flags=0x%04x, dtype=%s, dsz=%hu, "
"data_off=%hu", vs->flags, vsd_dtype2name[vs->dtype],
vs->dsz, vs->data_off);
sbuf_printf(buf, "\n\t\t\tvoistatdata: ");
stats_voistatdata_tostr(vsd, v->dtype, vs->dtype, vs->dsz,
sctx->fmt, buf, dump);
}
static void
stats_v1_itercb_tostr_json(struct statsblobv1 *sb, struct voi *v, struct voistat *vs,
struct sb_iter_ctx *ctx)
{
struct sb_tostrcb_ctx *sctx;
struct metablob *tpl_mb;
struct sbuf *buf;
const char *fmtstr;
void *vsd;
uint8_t dump;
sctx = ctx->usrctx;
buf = sctx->buf;
tpl_mb = sctx->tpl ? sctx->tpl->mb : NULL;
dump = ((sctx->flags & SB_TOSTR_OBJDUMP) != 0);
if (ctx->flags & SB_IT_FIRST_CB) {
sbuf_putc(buf, '{');
if (dump) {
sbuf_printf(buf, "\"abi\":%hhu,\"endian\":%hhu,"
"\"maxsz\":%hu,\"cursz\":%hu,\"created\":%jd,"
"\"lastrst\":%jd,\"flags\":%hu,\"stats_off\":%hu,"
"\"statsdata_off\":%hu,", sb->abi,
sb->endian, sb->maxsz, sb->cursz, sb->created,
sb->lastrst, sb->flags, sb->stats_off,
sb->statsdata_off);
}
if (tpl_mb == NULL)
fmtstr = "\"tplname\":%s,\"tplhash\":%u,\"vois\":{";
else
fmtstr = "\"tplname\":\"%s\",\"tplhash\":%u,\"vois\":{";
sbuf_printf(buf, fmtstr, tpl_mb ? tpl_mb->tplname : "null",
sb->tplhash);
}
if (ctx->flags & SB_IT_FIRST_VOISTAT) {
if (dump) {
sbuf_printf(buf, "\"[%d]\":{\"id\":%d", ctx->vslot,
v->id);
if (v->id < 0) {
sbuf_printf(buf, "},");
return;
}
if (tpl_mb == NULL)
fmtstr = ",\"name\":%s,\"flags\":%hu,"
"\"dtype\":\"%s\",\"voistatmaxid\":%hhd,"
"\"stats_off\":%hu,";
else
fmtstr = ",\"name\":\"%s\",\"flags\":%hu,"
"\"dtype\":\"%s\",\"voistatmaxid\":%hhd,"
"\"stats_off\":%hu,";
sbuf_printf(buf, fmtstr, tpl_mb ?
tpl_mb->voi_meta[v->id].name : "null", v->flags,
vsd_dtype2name[v->dtype], v->voistatmaxid,
v->stats_off);
} else {
if (tpl_mb == NULL) {
sbuf_printf(buf, "\"[%hd]\":{", v->id);
} else {
sbuf_printf(buf, "\"%s\":{",
tpl_mb->voi_meta[v->id].name);
}
}
sbuf_cat(buf, "\"stats\":{");
}
vsd = BLOB_OFFSET(sb, vs->data_off);
if (dump) {
sbuf_printf(buf, "\"[%hhd]\":", ctx->vsslot);
if (vs->stype < 0) {
sbuf_printf(buf, "{\"stype\":-1},");
return;
}
sbuf_printf(buf, "{\"stype\":\"%s\",\"errs\":%hu,\"flags\":%hu,"
"\"dtype\":\"%s\",\"data_off\":%hu,\"voistatdata\":{",
vs_stype2name[vs->stype], vs->errs, vs->flags,
vsd_dtype2name[vs->dtype], vs->data_off);
} else if (vs->stype > 0) {
if (tpl_mb == NULL)
sbuf_printf(buf, "\"[%hhd]\":", vs->stype);
else
sbuf_printf(buf, "\"%s\":", vs_stype2name[vs->stype]);
} else
return;
if ((vs->flags & VS_VSDVALID) || dump) {
if (!dump)
sbuf_printf(buf, "{\"errs\":%hu,", vs->errs);
/* Simple non-compound VSD types need a key. */
if (!vsd_compoundtype[vs->dtype])
sbuf_cat(buf, "\"val\":");
stats_voistatdata_tostr(vsd, v->dtype, vs->dtype, vs->dsz,
sctx->fmt, buf, dump);
sbuf_cat(buf, dump ? "}}" : "}");
} else
sbuf_cat(buf, dump ? "null}" : "null");
if (ctx->flags & SB_IT_LAST_VOISTAT)
sbuf_cat(buf, "}}");
if (ctx->flags & SB_IT_LAST_CB)
sbuf_cat(buf, "}}");
else
sbuf_putc(buf, ',');
}
static int
stats_v1_itercb_tostr(struct statsblobv1 *sb, struct voi *v, struct voistat *vs,
struct sb_iter_ctx *ctx)
{
struct sb_tostrcb_ctx *sctx;
sctx = ctx->usrctx;
switch (sctx->fmt) {
case SB_STRFMT_FREEFORM:
stats_v1_itercb_tostr_freeform(sb, v, vs, ctx);
break;
case SB_STRFMT_JSON:
stats_v1_itercb_tostr_json(sb, v, vs, ctx);
break;
default:
break;
}
return (sbuf_error(sctx->buf));
}
int
stats_v1_blob_tostr(struct statsblobv1 *sb, struct sbuf *buf,
enum sb_str_fmt fmt, uint32_t flags)
{
struct sb_tostrcb_ctx sctx;
uint32_t iflags;
if (sb == NULL || sb->abi != STATS_ABI_V1 || buf == NULL ||
fmt >= SB_STRFMT_NUM_FMTS)
return (EINVAL);
sctx.buf = buf;
sctx.fmt = fmt;
sctx.flags = flags;
if (flags & SB_TOSTR_META) {
if (stats_tpl_fetch(stats_tpl_fetch_allocid(NULL, sb->tplhash),
&sctx.tpl))
return (EINVAL);
} else
sctx.tpl = NULL;
iflags = 0;
if (flags & SB_TOSTR_OBJDUMP)
iflags |= (SB_IT_NULLVOI | SB_IT_NULLVOISTAT);
stats_v1_blob_iter(sb, stats_v1_itercb_tostr, &sctx, iflags);
return (sbuf_error(buf));
}
static int
stats_v1_itercb_visit(struct statsblobv1 *sb, struct voi *v,
struct voistat *vs, struct sb_iter_ctx *ctx)
{
struct sb_visitcb_ctx *vctx;
struct sb_visit sbv;
vctx = ctx->usrctx;
sbv.tplhash = sb->tplhash;
sbv.voi_id = v->id;
sbv.voi_dtype = v->dtype;
sbv.vs_stype = vs->stype;
sbv.vs_dtype = vs->dtype;
sbv.vs_dsz = vs->dsz;
sbv.vs_data = BLOB_OFFSET(sb, vs->data_off);
sbv.vs_errs = vs->errs;
sbv.flags = ctx->flags & (SB_IT_FIRST_CB | SB_IT_LAST_CB |
SB_IT_FIRST_VOI | SB_IT_LAST_VOI | SB_IT_FIRST_VOISTAT |
SB_IT_LAST_VOISTAT);
return (vctx->cb(&sbv, vctx->usrctx));
}
int
stats_v1_blob_visit(struct statsblobv1 *sb, stats_blob_visitcb_t func,
void *usrctx)
{
struct sb_visitcb_ctx vctx;
if (sb == NULL || sb->abi != STATS_ABI_V1 || func == NULL)
return (EINVAL);
vctx.cb = func;
vctx.usrctx = usrctx;
stats_v1_blob_iter(sb, stats_v1_itercb_visit, &vctx, 0);
return (0);
}
static int
stats_v1_icb_reset_voistat(struct statsblobv1 *sb, struct voi *v __unused,
struct voistat *vs, struct sb_iter_ctx *ctx __unused)
{
void *vsd;
if (vs->stype == VS_STYPE_VOISTATE)
return (0);
vsd = BLOB_OFFSET(sb, vs->data_off);
/* Perform the stat type's default reset action. */
switch (vs->stype) {
case VS_STYPE_SUM:
switch (vs->dtype) {
case VSD_DTYPE_Q_S32:
Q_SIFVAL(VSD(q32, vsd)->sq32, 0);
break;
case VSD_DTYPE_Q_U32:
Q_SIFVAL(VSD(q32, vsd)->uq32, 0);
break;
case VSD_DTYPE_Q_S64:
Q_SIFVAL(VSD(q64, vsd)->sq64, 0);
break;
case VSD_DTYPE_Q_U64:
Q_SIFVAL(VSD(q64, vsd)->uq64, 0);
break;
default:
bzero(vsd, vs->dsz);
break;
}
break;
case VS_STYPE_MAX:
switch (vs->dtype) {
case VSD_DTYPE_Q_S32:
Q_SIFVAL(VSD(q32, vsd)->sq32,
Q_IFMINVAL(VSD(q32, vsd)->sq32));
break;
case VSD_DTYPE_Q_U32:
Q_SIFVAL(VSD(q32, vsd)->uq32,
Q_IFMINVAL(VSD(q32, vsd)->uq32));
break;
case VSD_DTYPE_Q_S64:
Q_SIFVAL(VSD(q64, vsd)->sq64,
Q_IFMINVAL(VSD(q64, vsd)->sq64));
break;
case VSD_DTYPE_Q_U64:
Q_SIFVAL(VSD(q64, vsd)->uq64,
Q_IFMINVAL(VSD(q64, vsd)->uq64));
break;
default:
memcpy(vsd, &numeric_limits[LIM_MIN][vs->dtype],
vs->dsz);
break;
}
break;
case VS_STYPE_MIN:
switch (vs->dtype) {
case VSD_DTYPE_Q_S32:
Q_SIFVAL(VSD(q32, vsd)->sq32,
Q_IFMAXVAL(VSD(q32, vsd)->sq32));
break;
case VSD_DTYPE_Q_U32:
Q_SIFVAL(VSD(q32, vsd)->uq32,
Q_IFMAXVAL(VSD(q32, vsd)->uq32));
break;
case VSD_DTYPE_Q_S64:
Q_SIFVAL(VSD(q64, vsd)->sq64,
Q_IFMAXVAL(VSD(q64, vsd)->sq64));
break;
case VSD_DTYPE_Q_U64:
Q_SIFVAL(VSD(q64, vsd)->uq64,
Q_IFMAXVAL(VSD(q64, vsd)->uq64));
break;
default:
memcpy(vsd, &numeric_limits[LIM_MAX][vs->dtype],
vs->dsz);
break;
}
break;
case VS_STYPE_HIST:
{
/* Reset bucket counts. */
struct voistatdata_hist *hist;
int i, is32bit;
uint16_t nbkts;
hist = VSD(hist, vsd);
switch (vs->dtype) {
case VSD_DTYPE_CRHIST32:
nbkts = HIST_VSDSZ2NBKTS(crhist32, vs->dsz);
is32bit = 1;
break;
case VSD_DTYPE_DRHIST32:
nbkts = HIST_VSDSZ2NBKTS(drhist32, vs->dsz);
is32bit = 1;
break;
case VSD_DTYPE_DVHIST32:
nbkts = HIST_VSDSZ2NBKTS(dvhist32, vs->dsz);
is32bit = 1;
break;
case VSD_DTYPE_CRHIST64:
nbkts = HIST_VSDSZ2NBKTS(crhist64, vs->dsz);
is32bit = 0;
break;
case VSD_DTYPE_DRHIST64:
nbkts = HIST_VSDSZ2NBKTS(drhist64, vs->dsz);
is32bit = 0;
break;
case VSD_DTYPE_DVHIST64:
nbkts = HIST_VSDSZ2NBKTS(dvhist64, vs->dsz);
is32bit = 0;
break;
default:
return (0);
}
bzero(VSD_HIST_FIELDPTR(hist, vs->dtype, oob),
is32bit ? sizeof(uint32_t) : sizeof(uint64_t));
for (i = nbkts - 1; i >= 0; i--) {
bzero(VSD_HIST_FIELDPTR(hist, vs->dtype,
bkts[i].cnt), is32bit ? sizeof(uint32_t) :
sizeof(uint64_t));
}
break;
}
case VS_STYPE_TDGST:
{
/* Reset sample count centroids array/tree. */
struct voistatdata_tdgst *tdgst;
struct ctdth32 *ctd32tree;
struct ctdth64 *ctd64tree;
struct voistatdata_tdgstctd32 *ctd32;
struct voistatdata_tdgstctd64 *ctd64;
tdgst = VSD(tdgst, vsd);
switch (vs->dtype) {
case VSD_DTYPE_TDGSTCLUST32:
VSD(tdgstclust32, tdgst)->smplcnt = 0;
VSD(tdgstclust32, tdgst)->compcnt = 0;
ctd32tree = &VSD(tdgstclust32, tdgst)->ctdtree;
ARB_INIT(ctd32, ctdlnk, ctd32tree,
ARB_MAXNODES(ctd32tree)) {
ctd32->cnt = 0;
Q_SIFVAL(ctd32->mu, 0);
}
#ifdef DIAGNOSTIC
RB_INIT(&VSD(tdgstclust32, tdgst)->rbctdtree);
#endif
break;
case VSD_DTYPE_TDGSTCLUST64:
VSD(tdgstclust64, tdgst)->smplcnt = 0;
VSD(tdgstclust64, tdgst)->compcnt = 0;
ctd64tree = &VSD(tdgstclust64, tdgst)->ctdtree;
ARB_INIT(ctd64, ctdlnk, ctd64tree,
ARB_MAXNODES(ctd64tree)) {
ctd64->cnt = 0;
Q_SIFVAL(ctd64->mu, 0);
}
#ifdef DIAGNOSTIC
RB_INIT(&VSD(tdgstclust64, tdgst)->rbctdtree);
#endif
break;
default:
return (0);
}
break;
}
default:
KASSERT(0, ("Unknown VOI stat type %d", vs->stype));
break;
}
vs->errs = 0;
vs->flags &= ~VS_VSDVALID;
return (0);
}
int
stats_v1_blob_snapshot(struct statsblobv1 **dst, size_t dstmaxsz,
struct statsblobv1 *src, uint32_t flags)
{
int error;
if (src != NULL && src->abi == STATS_ABI_V1) {
error = stats_v1_blob_clone(dst, dstmaxsz, src, flags);
if (!error) {
if (flags & SB_CLONE_RSTSRC) {
stats_v1_blob_iter(src,
stats_v1_icb_reset_voistat, NULL, 0);
src->lastrst = stats_sbinuptime();
}
stats_v1_blob_finalise(*dst);
}
} else
error = EINVAL;
return (error);
}
static inline int
stats_v1_voi_update_max(enum vsd_dtype voi_dtype __unused,
struct voistatdata *voival, struct voistat *vs, void *vsd)
{
int error;
KASSERT(vs->dtype < VSD_NUM_DTYPES,
("Unknown VSD dtype %d", vs->dtype));
error = 0;
switch (vs->dtype) {
case VSD_DTYPE_INT_S32:
if (VSD(int32, vsd)->s32 < voival->int32.s32) {
VSD(int32, vsd)->s32 = voival->int32.s32;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_U32:
if (VSD(int32, vsd)->u32 < voival->int32.u32) {
VSD(int32, vsd)->u32 = voival->int32.u32;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_S64:
if (VSD(int64, vsd)->s64 < voival->int64.s64) {
VSD(int64, vsd)->s64 = voival->int64.s64;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_U64:
if (VSD(int64, vsd)->u64 < voival->int64.u64) {
VSD(int64, vsd)->u64 = voival->int64.u64;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_SLONG:
if (VSD(intlong, vsd)->slong < voival->intlong.slong) {
VSD(intlong, vsd)->slong = voival->intlong.slong;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_ULONG:
if (VSD(intlong, vsd)->ulong < voival->intlong.ulong) {
VSD(intlong, vsd)->ulong = voival->intlong.ulong;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_S32:
if (Q_QLTQ(VSD(q32, vsd)->sq32, voival->q32.sq32) &&
(0 == (error = Q_QCPYVALQ(&VSD(q32, vsd)->sq32,
voival->q32.sq32)))) {
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_U32:
if (Q_QLTQ(VSD(q32, vsd)->uq32, voival->q32.uq32) &&
(0 == (error = Q_QCPYVALQ(&VSD(q32, vsd)->uq32,
voival->q32.uq32)))) {
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_S64:
if (Q_QLTQ(VSD(q64, vsd)->sq64, voival->q64.sq64) &&
(0 == (error = Q_QCPYVALQ(&VSD(q64, vsd)->sq64,
voival->q64.sq64)))) {
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_U64:
if (Q_QLTQ(VSD(q64, vsd)->uq64, voival->q64.uq64) &&
(0 == (error = Q_QCPYVALQ(&VSD(q64, vsd)->uq64,
voival->q64.uq64)))) {
vs->flags |= VS_VSDVALID;
}
break;
default:
error = EINVAL;
break;
}
return (error);
}
static inline int
stats_v1_voi_update_min(enum vsd_dtype voi_dtype __unused,
struct voistatdata *voival, struct voistat *vs, void *vsd)
{
int error;
KASSERT(vs->dtype < VSD_NUM_DTYPES,
("Unknown VSD dtype %d", vs->dtype));
error = 0;
switch (vs->dtype) {
case VSD_DTYPE_INT_S32:
if (VSD(int32, vsd)->s32 > voival->int32.s32) {
VSD(int32, vsd)->s32 = voival->int32.s32;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_U32:
if (VSD(int32, vsd)->u32 > voival->int32.u32) {
VSD(int32, vsd)->u32 = voival->int32.u32;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_S64:
if (VSD(int64, vsd)->s64 > voival->int64.s64) {
VSD(int64, vsd)->s64 = voival->int64.s64;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_U64:
if (VSD(int64, vsd)->u64 > voival->int64.u64) {
VSD(int64, vsd)->u64 = voival->int64.u64;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_SLONG:
if (VSD(intlong, vsd)->slong > voival->intlong.slong) {
VSD(intlong, vsd)->slong = voival->intlong.slong;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_INT_ULONG:
if (VSD(intlong, vsd)->ulong > voival->intlong.ulong) {
VSD(intlong, vsd)->ulong = voival->intlong.ulong;
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_S32:
if (Q_QGTQ(VSD(q32, vsd)->sq32, voival->q32.sq32) &&
(0 == (error = Q_QCPYVALQ(&VSD(q32, vsd)->sq32,
voival->q32.sq32)))) {
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_U32:
if (Q_QGTQ(VSD(q32, vsd)->uq32, voival->q32.uq32) &&
(0 == (error = Q_QCPYVALQ(&VSD(q32, vsd)->uq32,
voival->q32.uq32)))) {
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_S64:
if (Q_QGTQ(VSD(q64, vsd)->sq64, voival->q64.sq64) &&
(0 == (error = Q_QCPYVALQ(&VSD(q64, vsd)->sq64,
voival->q64.sq64)))) {
vs->flags |= VS_VSDVALID;
}
break;
case VSD_DTYPE_Q_U64:
if (Q_QGTQ(VSD(q64, vsd)->uq64, voival->q64.uq64) &&
(0 == (error = Q_QCPYVALQ(&VSD(q64, vsd)->uq64,
voival->q64.uq64)))) {
vs->flags |= VS_VSDVALID;
}
break;
default:
error = EINVAL;
break;
}
return (error);
}
static inline int
stats_v1_voi_update_sum(enum vsd_dtype voi_dtype __unused,
struct voistatdata *voival, struct voistat *vs, void *vsd)
{
int error;
KASSERT(vs->dtype < VSD_NUM_DTYPES,
("Unknown VSD dtype %d", vs->dtype));
error = 0;
switch (vs->dtype) {
case VSD_DTYPE_INT_S32:
VSD(int32, vsd)->s32 += voival->int32.s32;
break;
case VSD_DTYPE_INT_U32:
VSD(int32, vsd)->u32 += voival->int32.u32;
break;
case VSD_DTYPE_INT_S64:
VSD(int64, vsd)->s64 += voival->int64.s64;
break;
case VSD_DTYPE_INT_U64:
VSD(int64, vsd)->u64 += voival->int64.u64;
break;
case VSD_DTYPE_INT_SLONG:
VSD(intlong, vsd)->slong += voival->intlong.slong;
break;
case VSD_DTYPE_INT_ULONG:
VSD(intlong, vsd)->ulong += voival->intlong.ulong;
break;
case VSD_DTYPE_Q_S32:
error = Q_QADDQ(&VSD(q32, vsd)->sq32, voival->q32.sq32);
break;
case VSD_DTYPE_Q_U32:
error = Q_QADDQ(&VSD(q32, vsd)->uq32, voival->q32.uq32);
break;
case VSD_DTYPE_Q_S64:
error = Q_QADDQ(&VSD(q64, vsd)->sq64, voival->q64.sq64);
break;
case VSD_DTYPE_Q_U64:
error = Q_QADDQ(&VSD(q64, vsd)->uq64, voival->q64.uq64);
break;
default:
error = EINVAL;
break;
}
if (!error)
vs->flags |= VS_VSDVALID;
return (error);
}
static inline int
stats_v1_voi_update_hist(enum vsd_dtype voi_dtype, struct voistatdata *voival,
struct voistat *vs, struct voistatdata_hist *hist)
{
struct voistatdata_numeric *bkt_lb, *bkt_ub;
uint64_t *oob64, *cnt64;
uint32_t *oob32, *cnt32;
int error, i, found, is32bit, has_ub, eq_only;
error = 0;
switch (vs->dtype) {
case VSD_DTYPE_CRHIST32:
i = HIST_VSDSZ2NBKTS(crhist32, vs->dsz);
is32bit = 1;
has_ub = eq_only = 0;
oob32 = &VSD(crhist32, hist)->oob;
break;
case VSD_DTYPE_DRHIST32:
i = HIST_VSDSZ2NBKTS(drhist32, vs->dsz);
is32bit = has_ub = 1;
eq_only = 0;
oob32 = &VSD(drhist32, hist)->oob;
break;
case VSD_DTYPE_DVHIST32:
i = HIST_VSDSZ2NBKTS(dvhist32, vs->dsz);
is32bit = eq_only = 1;
has_ub = 0;
oob32 = &VSD(dvhist32, hist)->oob;
break;
case VSD_DTYPE_CRHIST64:
i = HIST_VSDSZ2NBKTS(crhist64, vs->dsz);
is32bit = has_ub = eq_only = 0;
oob64 = &VSD(crhist64, hist)->oob;
break;
case VSD_DTYPE_DRHIST64:
i = HIST_VSDSZ2NBKTS(drhist64, vs->dsz);
is32bit = eq_only = 0;
has_ub = 1;
oob64 = &VSD(drhist64, hist)->oob;
break;
case VSD_DTYPE_DVHIST64:
i = HIST_VSDSZ2NBKTS(dvhist64, vs->dsz);
is32bit = has_ub = 0;
eq_only = 1;
oob64 = &VSD(dvhist64, hist)->oob;
break;
default:
return (EINVAL);
}
i--; /* Adjust for 0-based array index. */
/* XXXLAS: Should probably use a better bucket search algorithm. ARB? */
for (found = 0; i >= 0 && !found; i--) {
switch (vs->dtype) {
case VSD_DTYPE_CRHIST32:
bkt_lb = &VSD(crhist32, hist)->bkts[i].lb;
cnt32 = &VSD(crhist32, hist)->bkts[i].cnt;
break;
case VSD_DTYPE_DRHIST32:
bkt_lb = &VSD(drhist32, hist)->bkts[i].lb;
bkt_ub = &VSD(drhist32, hist)->bkts[i].ub;
cnt32 = &VSD(drhist32, hist)->bkts[i].cnt;
break;
case VSD_DTYPE_DVHIST32:
bkt_lb = &VSD(dvhist32, hist)->bkts[i].val;
cnt32 = &VSD(dvhist32, hist)->bkts[i].cnt;
break;
case VSD_DTYPE_CRHIST64:
bkt_lb = &VSD(crhist64, hist)->bkts[i].lb;
cnt64 = &VSD(crhist64, hist)->bkts[i].cnt;
break;
case VSD_DTYPE_DRHIST64:
bkt_lb = &VSD(drhist64, hist)->bkts[i].lb;
bkt_ub = &VSD(drhist64, hist)->bkts[i].ub;
cnt64 = &VSD(drhist64, hist)->bkts[i].cnt;
break;
case VSD_DTYPE_DVHIST64:
bkt_lb = &VSD(dvhist64, hist)->bkts[i].val;
cnt64 = &VSD(dvhist64, hist)->bkts[i].cnt;
break;
default:
return (EINVAL);
}
switch (voi_dtype) {
case VSD_DTYPE_INT_S32:
if (voival->int32.s32 >= bkt_lb->int32.s32) {
if ((eq_only && voival->int32.s32 ==
bkt_lb->int32.s32) ||
(!eq_only && (!has_ub ||
voival->int32.s32 < bkt_ub->int32.s32)))
found = 1;
}
break;
case VSD_DTYPE_INT_U32:
if (voival->int32.u32 >= bkt_lb->int32.u32) {
if ((eq_only && voival->int32.u32 ==
bkt_lb->int32.u32) ||
(!eq_only && (!has_ub ||
voival->int32.u32 < bkt_ub->int32.u32)))
found = 1;
}
break;
case VSD_DTYPE_INT_S64:
if (voival->int64.s64 >= bkt_lb->int64.s64)
if ((eq_only && voival->int64.s64 ==
bkt_lb->int64.s64) ||
(!eq_only && (!has_ub ||
voival->int64.s64 < bkt_ub->int64.s64)))
found = 1;
break;
case VSD_DTYPE_INT_U64:
if (voival->int64.u64 >= bkt_lb->int64.u64)
if ((eq_only && voival->int64.u64 ==
bkt_lb->int64.u64) ||
(!eq_only && (!has_ub ||
voival->int64.u64 < bkt_ub->int64.u64)))
found = 1;
break;
case VSD_DTYPE_INT_SLONG:
if (voival->intlong.slong >= bkt_lb->intlong.slong)
if ((eq_only && voival->intlong.slong ==
bkt_lb->intlong.slong) ||
(!eq_only && (!has_ub ||
voival->intlong.slong <
bkt_ub->intlong.slong)))
found = 1;
break;
case VSD_DTYPE_INT_ULONG:
if (voival->intlong.ulong >= bkt_lb->intlong.ulong)
if ((eq_only && voival->intlong.ulong ==
bkt_lb->intlong.ulong) ||
(!eq_only && (!has_ub ||
voival->intlong.ulong <
bkt_ub->intlong.ulong)))
found = 1;
break;
case VSD_DTYPE_Q_S32:
if (Q_QGEQ(voival->q32.sq32, bkt_lb->q32.sq32))
if ((eq_only && Q_QEQ(voival->q32.sq32,
bkt_lb->q32.sq32)) ||
(!eq_only && (!has_ub ||
Q_QLTQ(voival->q32.sq32,
bkt_ub->q32.sq32))))
found = 1;
break;
case VSD_DTYPE_Q_U32:
if (Q_QGEQ(voival->q32.uq32, bkt_lb->q32.uq32))
if ((eq_only && Q_QEQ(voival->q32.uq32,
bkt_lb->q32.uq32)) ||
(!eq_only && (!has_ub ||
Q_QLTQ(voival->q32.uq32,
bkt_ub->q32.uq32))))
found = 1;
break;
case VSD_DTYPE_Q_S64:
if (Q_QGEQ(voival->q64.sq64, bkt_lb->q64.sq64))
if ((eq_only && Q_QEQ(voival->q64.sq64,
bkt_lb->q64.sq64)) ||
(!eq_only && (!has_ub ||
Q_QLTQ(voival->q64.sq64,
bkt_ub->q64.sq64))))
found = 1;
break;
case VSD_DTYPE_Q_U64:
if (Q_QGEQ(voival->q64.uq64, bkt_lb->q64.uq64))
if ((eq_only && Q_QEQ(voival->q64.uq64,
bkt_lb->q64.uq64)) ||
(!eq_only && (!has_ub ||
Q_QLTQ(voival->q64.uq64,
bkt_ub->q64.uq64))))
found = 1;
break;
default:
break;
}
}
if (found) {
if (is32bit)
*cnt32 += 1;
else
*cnt64 += 1;
} else {
if (is32bit)
*oob32 += 1;
else
*oob64 += 1;
}
vs->flags |= VS_VSDVALID;
return (error);
}
static inline int
stats_v1_vsd_tdgst_compress(enum vsd_dtype vs_dtype,
struct voistatdata_tdgst *tdgst, int attempt)
{
struct ctdth32 *ctd32tree;
struct ctdth64 *ctd64tree;
struct voistatdata_tdgstctd32 *ctd32;
struct voistatdata_tdgstctd64 *ctd64;
uint64_t ebits, idxmask;
uint32_t bitsperidx, nebits;
int error, idx, is32bit, maxctds, remctds, tmperr;
error = 0;
switch (vs_dtype) {
case VSD_DTYPE_TDGSTCLUST32:
ctd32tree = &VSD(tdgstclust32, tdgst)->ctdtree;
if (!ARB_FULL(ctd32tree))
return (0);
VSD(tdgstclust32, tdgst)->compcnt++;
maxctds = remctds = ARB_MAXNODES(ctd32tree);
ARB_RESET_TREE(ctd32tree, ctdth32, maxctds);
VSD(tdgstclust32, tdgst)->smplcnt = 0;
is32bit = 1;
ctd64tree = NULL;
ctd64 = NULL;
#ifdef DIAGNOSTIC
RB_INIT(&VSD(tdgstclust32, tdgst)->rbctdtree);
#endif
break;
case VSD_DTYPE_TDGSTCLUST64:
ctd64tree = &VSD(tdgstclust64, tdgst)->ctdtree;
if (!ARB_FULL(ctd64tree))
return (0);
VSD(tdgstclust64, tdgst)->compcnt++;
maxctds = remctds = ARB_MAXNODES(ctd64tree);
ARB_RESET_TREE(ctd64tree, ctdth64, maxctds);
VSD(tdgstclust64, tdgst)->smplcnt = 0;
is32bit = 0;
ctd32tree = NULL;
ctd32 = NULL;
#ifdef DIAGNOSTIC
RB_INIT(&VSD(tdgstclust64, tdgst)->rbctdtree);
#endif
break;
default:
return (EINVAL);
}
/*
* Rebuild the t-digest ARB by pseudorandomly selecting centroids and
* re-inserting the mu/cnt of each as a value and corresponding weight.
*/
/*
* XXXCEM: random(9) is currently rand(3), not random(3). rand(3)
* RAND_MAX happens to be approximately 31 bits (range [0,
* 0x7ffffffd]), so the math kinda works out. When/if this portion of
* the code is compiled in userspace, it gets the random(3) behavior,
* which has expected range [0, 0x7fffffff].
*/
#define bitsperrand 31
ebits = 0;
nebits = 0;
bitsperidx = fls(maxctds);
KASSERT(bitsperidx <= sizeof(ebits) << 3,
("%s: bitsperidx=%d, ebits=%d",
__func__, bitsperidx, (int)(sizeof(ebits) << 3)));
idxmask = (UINT64_C(1) << bitsperidx) - 1;
/* Initialise the free list with randomised centroid indices. */
for (; remctds > 0; remctds--) {
while (nebits < bitsperidx) {
ebits |= ((uint64_t)random()) << nebits;
nebits += bitsperrand;
if (nebits > (sizeof(ebits) << 3))
nebits = sizeof(ebits) << 3;
}
idx = ebits & idxmask;
nebits -= bitsperidx;
ebits >>= bitsperidx;
/*
* Select the next centroid to put on the ARB free list. We
* start with the centroid at our randomly selected array index,
* and work our way forwards until finding one (the latter
* aspect reduces re-insertion randomness, but is good enough).
*/
do {
if (idx >= maxctds)
idx %= maxctds;
if (is32bit)
ctd32 = ARB_NODE(ctd32tree, idx);
else
ctd64 = ARB_NODE(ctd64tree, idx);
} while ((is32bit ? ARB_ISFREE(ctd32, ctdlnk) :
ARB_ISFREE(ctd64, ctdlnk)) && ++idx);
/* Put the centroid on the ARB free list. */
if (is32bit)
ARB_RETURNFREE(ctd32tree, ctd32, ctdlnk);
else
ARB_RETURNFREE(ctd64tree, ctd64, ctdlnk);
}
/*
* The free list now contains the randomised indices of every centroid.
* Walk the free list from start to end, re-inserting each centroid's
* mu/cnt. The tdgst_add() call may or may not consume the free centroid
* we re-insert values from during each loop iteration, so we must latch
* the index of the next free list centroid before the re-insertion
* call. The previous loop above should have left the centroid pointer
* pointing to the element at the head of the free list.
*/
KASSERT((is32bit ?
ARB_FREEIDX(ctd32tree) == ARB_SELFIDX(ctd32tree, ctd32) :
ARB_FREEIDX(ctd64tree) == ARB_SELFIDX(ctd64tree, ctd64)),
("%s: t-digest ARB@%p free list bug", __func__,
(is32bit ? (void *)ctd32tree : (void *)ctd64tree)));
remctds = maxctds;
while ((is32bit ? ctd32 != NULL : ctd64 != NULL)) {
tmperr = 0;
if (is32bit) {
s64q_t x;
idx = ARB_NEXTFREEIDX(ctd32, ctdlnk);
/* Cloning a s32q_t into a s64q_t should never fail. */
tmperr = Q_QCLONEQ(&x, ctd32->mu);
tmperr = tmperr ? tmperr : stats_v1_vsd_tdgst_add(
vs_dtype, tdgst, x, ctd32->cnt, attempt);
ctd32 = ARB_NODE(ctd32tree, idx);
KASSERT(ctd32 == NULL || ARB_ISFREE(ctd32, ctdlnk),
("%s: t-digest ARB@%p free list bug", __func__,
ctd32tree));
} else {
idx = ARB_NEXTFREEIDX(ctd64, ctdlnk);
tmperr = stats_v1_vsd_tdgst_add(vs_dtype, tdgst,
ctd64->mu, ctd64->cnt, attempt);
ctd64 = ARB_NODE(ctd64tree, idx);
KASSERT(ctd64 == NULL || ARB_ISFREE(ctd64, ctdlnk),
("%s: t-digest ARB@%p free list bug", __func__,
ctd64tree));
}
/*
* This process should not produce errors, bugs notwithstanding.
* Just in case, latch any errors and attempt all re-insertions.
*/
error = tmperr ? tmperr : error;
remctds--;
}
KASSERT(remctds == 0, ("%s: t-digest ARB@%p free list bug", __func__,
(is32bit ? (void *)ctd32tree : (void *)ctd64tree)));
return (error);
}
static inline int
stats_v1_vsd_tdgst_add(enum vsd_dtype vs_dtype, struct voistatdata_tdgst *tdgst,
s64q_t x, uint64_t weight, int attempt)
{
#ifdef DIAGNOSTIC
char qstr[Q_MAXSTRLEN(x, 10)];
#endif
struct ctdth32 *ctd32tree;
struct ctdth64 *ctd64tree;
void *closest, *cur, *lb, *ub;
struct voistatdata_tdgstctd32 *ctd32;
struct voistatdata_tdgstctd64 *ctd64;
uint64_t cnt, smplcnt, sum, tmpsum;
s64q_t k, minz, q, z;
int error, is32bit, n;
error = 0;
minz = Q_INI(&z, 0, 0, Q_NFBITS(x));
switch (vs_dtype) {
case VSD_DTYPE_TDGSTCLUST32:
if ((UINT32_MAX - weight) < VSD(tdgstclust32, tdgst)->smplcnt)
error = EOVERFLOW;
smplcnt = VSD(tdgstclust32, tdgst)->smplcnt;
ctd32tree = &VSD(tdgstclust32, tdgst)->ctdtree;
is32bit = 1;
ctd64tree = NULL;
ctd64 = NULL;
break;
case VSD_DTYPE_TDGSTCLUST64:
if ((UINT64_MAX - weight) < VSD(tdgstclust64, tdgst)->smplcnt)
error = EOVERFLOW;
smplcnt = VSD(tdgstclust64, tdgst)->smplcnt;
ctd64tree = &VSD(tdgstclust64, tdgst)->ctdtree;
is32bit = 0;
ctd32tree = NULL;
ctd32 = NULL;
break;
default:
error = EINVAL;
break;
}
if (error)
return (error);
/*
* Inspired by Ted Dunning's AVLTreeDigest.java
*/
do {
#if defined(DIAGNOSTIC)
KASSERT(attempt < 5,
("%s: Too many attempts", __func__));
#endif
if (attempt >= 5)
return (EAGAIN);
Q_SIFVAL(minz, Q_IFMAXVAL(minz));
closest = ub = NULL;
sum = tmpsum = 0;
if (is32bit)
lb = cur = (void *)(ctd32 = ARB_MIN(ctdth32, ctd32tree));
else
lb = cur = (void *)(ctd64 = ARB_MIN(ctdth64, ctd64tree));
if (lb == NULL) /* Empty tree. */
lb = (is32bit ? (void *)ARB_ROOT(ctd32tree) :
(void *)ARB_ROOT(ctd64tree));
/*
* Find the set of centroids with minimum distance to x and
* compute the sum of counts for all centroids with mean less
* than the first centroid in the set.
*/
for (; cur != NULL;
cur = (is32bit ?
(void *)(ctd32 = ARB_NEXT(ctdth32, ctd32tree, ctd32)) :
(void *)(ctd64 = ARB_NEXT(ctdth64, ctd64tree, ctd64)))) {
if (is32bit) {
cnt = ctd32->cnt;
KASSERT(Q_PRECEQ(ctd32->mu, x),
("%s: Q_RELPREC(mu,x)=%d", __func__,
Q_RELPREC(ctd32->mu, x)));
/* Ok to assign as both have same precision. */
z = ctd32->mu;
} else {
cnt = ctd64->cnt;
KASSERT(Q_PRECEQ(ctd64->mu, x),
("%s: Q_RELPREC(mu,x)=%d", __func__,
Q_RELPREC(ctd64->mu, x)));
/* Ok to assign as both have same precision. */
z = ctd64->mu;
}
error = Q_QSUBQ(&z, x);
#if defined(DIAGNOSTIC)
KASSERT(!error, ("%s: unexpected error %d", __func__,
error));
#endif
if (error)
return (error);
z = Q_QABS(z);
if (Q_QLTQ(z, minz)) {
minz = z;
lb = cur;
sum = tmpsum;
tmpsum += cnt;
} else if (Q_QGTQ(z, minz)) {
ub = cur;
break;
}
}
cur = (is32bit ?
(void *)(ctd32 = (struct voistatdata_tdgstctd32 *)lb) :
(void *)(ctd64 = (struct voistatdata_tdgstctd64 *)lb));
for (n = 0; cur != ub; cur = (is32bit ?
(void *)(ctd32 = ARB_NEXT(ctdth32, ctd32tree, ctd32)) :
(void *)(ctd64 = ARB_NEXT(ctdth64, ctd64tree, ctd64)))) {
if (is32bit)
cnt = ctd32->cnt;
else
cnt = ctd64->cnt;
q = Q_CTRLINI(16);
if (smplcnt == 1)
error = Q_QFRACI(&q, 1, 2);
else
/* [ sum + ((cnt - 1) / 2) ] / (smplcnt - 1) */
error = Q_QFRACI(&q, (sum << 1) + cnt - 1,
(smplcnt - 1) << 1);
k = q;
/* k = q x 4 x samplcnt x attempt */
error |= Q_QMULI(&k, 4 * smplcnt * attempt);
/* k = k x (1 - q) */
error |= Q_QSUBI(&q, 1);
q = Q_QABS(q);
error |= Q_QMULQ(&k, q);
#if defined(DIAGNOSTIC)
#if !defined(_KERNEL)
double q_dbl, k_dbl, q2d, k2d;
q2d = Q_Q2D(q);
k2d = Q_Q2D(k);
q_dbl = smplcnt == 1 ? 0.5 :
(sum + ((cnt - 1) / 2.0)) / (double)(smplcnt - 1);
k_dbl = 4 * smplcnt * q_dbl * (1.0 - q_dbl) * attempt;
/*
* If the difference between q and q_dbl is greater than
* the fractional precision of q, something is off.
* NB: q is holding the value of 1 - q
*/
q_dbl = 1.0 - q_dbl;
KASSERT((q_dbl > q2d ? q_dbl - q2d : q2d - q_dbl) <
(1.05 * ((double)1 / (double)(1ULL << Q_NFBITS(q)))),
("Q-type q bad precision"));
KASSERT((k_dbl > k2d ? k_dbl - k2d : k2d - k_dbl) <
1.0 + (0.01 * smplcnt),
("Q-type k bad precision"));
#endif /* !_KERNEL */
KASSERT(!error, ("%s: unexpected error %d", __func__,
error));
#endif /* DIAGNOSTIC */
if (error)
return (error);
if ((is32bit && ((ctd32->cnt + weight) <=
(uint64_t)Q_GIVAL(k))) ||
(!is32bit && ((ctd64->cnt + weight) <=
(uint64_t)Q_GIVAL(k)))) {
n++;
/* random() produces 31 bits. */
if (random() < (INT32_MAX / n))
closest = cur;
}
sum += cnt;
}
} while (closest == NULL &&
(is32bit ? ARB_FULL(ctd32tree) : ARB_FULL(ctd64tree)) &&
(error = stats_v1_vsd_tdgst_compress(vs_dtype, tdgst,
attempt++)) == 0);
if (error)
return (error);
if (closest != NULL) {
/* Merge with an existing centroid. */
if (is32bit) {
ctd32 = (struct voistatdata_tdgstctd32 *)closest;
error = Q_QSUBQ(&x, ctd32->mu);
/*
* The following calculation "x / (cnt + weight)"
* computes the amount by which to adjust the centroid's
* mu value in order to merge in the VOI sample.
*
* It can underflow (Q_QDIVI() returns ERANGE) when the
* user centroids' fractional precision (which is
* inherited by 'x') is too low to represent the result.
*
* A sophisticated approach to dealing with this issue
* would minimise accumulation of error by tracking
* underflow per centroid and making an adjustment when
* a LSB's worth of underflow has accumulated.
*
* A simpler approach is to let the result underflow
* i.e. merge the VOI sample into the centroid without
* adjusting the centroid's mu, and rely on the user to
* specify their t-digest with sufficient centroid
* fractional precision such that the accumulation of
* error from multiple underflows is of no material
* consequence to the centroid's final value of mu.
*
* For the moment, the latter approach is employed by
* simply ignoring ERANGE here.
*
* XXXLAS: Per-centroid underflow tracking is likely too
* onerous, but it probably makes sense to accumulate a
* single underflow error variable across all centroids
* and report it as part of the digest to provide
* additional visibility into the digest's fidelity.
*/
error = error ? error :
Q_QDIVI(&x, ctd32->cnt + weight);
if ((error && error != ERANGE)
|| (error = Q_QADDQ(&ctd32->mu, x))) {
#ifdef DIAGNOSTIC
KASSERT(!error, ("%s: unexpected error %d",
__func__, error));
#endif
return (error);
}
ctd32->cnt += weight;
error = ARB_REINSERT(ctdth32, ctd32tree, ctd32) ==
NULL ? 0 : EALREADY;
#ifdef DIAGNOSTIC
RB_REINSERT(rbctdth32,
&VSD(tdgstclust32, tdgst)->rbctdtree, ctd32);
#endif
} else {
ctd64 = (struct voistatdata_tdgstctd64 *)closest;
error = Q_QSUBQ(&x, ctd64->mu);
error = error ? error :
Q_QDIVI(&x, ctd64->cnt + weight);
/* Refer to is32bit ERANGE discussion above. */
if ((error && error != ERANGE)
|| (error = Q_QADDQ(&ctd64->mu, x))) {
KASSERT(!error, ("%s: unexpected error %d",
__func__, error));
return (error);
}
ctd64->cnt += weight;
error = ARB_REINSERT(ctdth64, ctd64tree, ctd64) ==
NULL ? 0 : EALREADY;
#ifdef DIAGNOSTIC
RB_REINSERT(rbctdth64,
&VSD(tdgstclust64, tdgst)->rbctdtree, ctd64);
#endif
}
} else {
/*
* Add a new centroid. If digest compression is working
* correctly, there should always be at least one free.
*/
if (is32bit) {
ctd32 = ARB_GETFREE(ctd32tree, ctdlnk);
#ifdef DIAGNOSTIC
KASSERT(ctd32 != NULL,
("%s: t-digest@%p has no free centroids",
__func__, tdgst));
#endif
if (ctd32 == NULL)
return (EAGAIN);
if ((error = Q_QCPYVALQ(&ctd32->mu, x)))
return (error);
ctd32->cnt = weight;
error = ARB_INSERT(ctdth32, ctd32tree, ctd32) == NULL ?
0 : EALREADY;
#ifdef DIAGNOSTIC
RB_INSERT(rbctdth32,
&VSD(tdgstclust32, tdgst)->rbctdtree, ctd32);
#endif
} else {
ctd64 = ARB_GETFREE(ctd64tree, ctdlnk);
#ifdef DIAGNOSTIC
KASSERT(ctd64 != NULL,
("%s: t-digest@%p has no free centroids",
__func__, tdgst));
#endif
if (ctd64 == NULL) /* Should not happen. */
return (EAGAIN);
/* Direct assignment ok as both have same type/prec. */
ctd64->mu = x;
ctd64->cnt = weight;
error = ARB_INSERT(ctdth64, ctd64tree, ctd64) == NULL ?
0 : EALREADY;
#ifdef DIAGNOSTIC
RB_INSERT(rbctdth64, &VSD(tdgstclust64,
tdgst)->rbctdtree, ctd64);
#endif
}
}
if (is32bit)
VSD(tdgstclust32, tdgst)->smplcnt += weight;
else {
VSD(tdgstclust64, tdgst)->smplcnt += weight;
#ifdef DIAGNOSTIC
struct rbctdth64 *rbctdtree =
&VSD(tdgstclust64, tdgst)->rbctdtree;
struct voistatdata_tdgstctd64 *rbctd64;
int i = 0;
ARB_FOREACH(ctd64, ctdth64, ctd64tree) {
rbctd64 = (i == 0 ? RB_MIN(rbctdth64, rbctdtree) :
RB_NEXT(rbctdth64, rbctdtree, rbctd64));
if (i >= ARB_CURNODES(ctd64tree)
|| ctd64 != rbctd64
|| ARB_MIN(ctdth64, ctd64tree) !=
RB_MIN(rbctdth64, rbctdtree)
|| ARB_MAX(ctdth64, ctd64tree) !=
RB_MAX(rbctdth64, rbctdtree)
|| ARB_LEFTIDX(ctd64, ctdlnk) !=
ARB_SELFIDX(ctd64tree, RB_LEFT(rbctd64, rblnk))
|| ARB_RIGHTIDX(ctd64, ctdlnk) !=
ARB_SELFIDX(ctd64tree, RB_RIGHT(rbctd64, rblnk))
|| ARB_PARENTIDX(ctd64, ctdlnk) !=
ARB_SELFIDX(ctd64tree,
RB_PARENT(rbctd64, rblnk))) {
Q_TOSTR(ctd64->mu, -1, 10, qstr, sizeof(qstr));
printf("ARB ctd=%3d p=%3d l=%3d r=%3d c=%2d "
"mu=%s\n",
(int)ARB_SELFIDX(ctd64tree, ctd64),
ARB_PARENTIDX(ctd64, ctdlnk),
ARB_LEFTIDX(ctd64, ctdlnk),
ARB_RIGHTIDX(ctd64, ctdlnk),
ARB_COLOR(ctd64, ctdlnk),
qstr);
Q_TOSTR(rbctd64->mu, -1, 10, qstr,
sizeof(qstr));
printf(" RB ctd=%3d p=%3d l=%3d r=%3d c=%2d "
"mu=%s\n",
(int)ARB_SELFIDX(ctd64tree, rbctd64),
(int)ARB_SELFIDX(ctd64tree,
RB_PARENT(rbctd64, rblnk)),
(int)ARB_SELFIDX(ctd64tree,
RB_LEFT(rbctd64, rblnk)),
(int)ARB_SELFIDX(ctd64tree,
RB_RIGHT(rbctd64, rblnk)),
RB_COLOR(rbctd64, rblnk),
qstr);
panic("RB@%p and ARB@%p trees differ\n",
rbctdtree, ctd64tree);
}
i++;
}
#endif /* DIAGNOSTIC */
}
return (error);
}
static inline int
stats_v1_voi_update_tdgst(enum vsd_dtype voi_dtype, struct voistatdata *voival,
struct voistat *vs, struct voistatdata_tdgst *tdgst)
{
s64q_t x;
int error;
error = 0;
switch (vs->dtype) {
case VSD_DTYPE_TDGSTCLUST32:
/* Use same precision as the user's centroids. */
Q_INI(&x, 0, 0, Q_NFBITS(
ARB_CNODE(&VSD(tdgstclust32, tdgst)->ctdtree, 0)->mu));
break;
case VSD_DTYPE_TDGSTCLUST64:
/* Use same precision as the user's centroids. */
Q_INI(&x, 0, 0, Q_NFBITS(
ARB_CNODE(&VSD(tdgstclust64, tdgst)->ctdtree, 0)->mu));
break;
default:
KASSERT(vs->dtype == VSD_DTYPE_TDGSTCLUST32 ||
vs->dtype == VSD_DTYPE_TDGSTCLUST64,
("%s: vs->dtype(%d) != VSD_DTYPE_TDGSTCLUST<32|64>",
__func__, vs->dtype));
return (EINVAL);
}
/*
* XXXLAS: Should have both a signed and unsigned 'x' variable to avoid
* returning EOVERFLOW if the voival would have fit in a u64q_t.
*/
switch (voi_dtype) {
case VSD_DTYPE_INT_S32:
error = Q_QCPYVALI(&x, voival->int32.s32);
break;
case VSD_DTYPE_INT_U32:
error = Q_QCPYVALI(&x, voival->int32.u32);
break;
case VSD_DTYPE_INT_S64:
error = Q_QCPYVALI(&x, voival->int64.s64);
break;
case VSD_DTYPE_INT_U64:
error = Q_QCPYVALI(&x, voival->int64.u64);
break;
case VSD_DTYPE_INT_SLONG:
error = Q_QCPYVALI(&x, voival->intlong.slong);
break;
case VSD_DTYPE_INT_ULONG:
error = Q_QCPYVALI(&x, voival->intlong.ulong);
break;
case VSD_DTYPE_Q_S32:
error = Q_QCPYVALQ(&x, voival->q32.sq32);
break;
case VSD_DTYPE_Q_U32:
error = Q_QCPYVALQ(&x, voival->q32.uq32);
break;
case VSD_DTYPE_Q_S64:
error = Q_QCPYVALQ(&x, voival->q64.sq64);
break;
case VSD_DTYPE_Q_U64:
error = Q_QCPYVALQ(&x, voival->q64.uq64);
break;
default:
error = EINVAL;
break;
}
if (error ||
(error = stats_v1_vsd_tdgst_add(vs->dtype, tdgst, x, 1, 1)))
return (error);
vs->flags |= VS_VSDVALID;
return (0);
}
int
stats_v1_voi_update(struct statsblobv1 *sb, int32_t voi_id,
enum vsd_dtype voi_dtype, struct voistatdata *voival, uint32_t flags)
{
struct voi *v;
struct voistat *vs;
void *statevsd, *vsd;
int error, i, tmperr;
error = 0;
if (sb == NULL || sb->abi != STATS_ABI_V1 || voi_id >= NVOIS(sb) ||
voi_dtype == 0 || voi_dtype >= VSD_NUM_DTYPES || voival == NULL)
return (EINVAL);
v = &sb->vois[voi_id];
if (voi_dtype != v->dtype || v->id < 0 ||
((flags & SB_VOI_RELUPDATE) && !(v->flags & VOI_REQSTATE)))
return (EINVAL);
vs = BLOB_OFFSET(sb, v->stats_off);
if (v->flags & VOI_REQSTATE)
statevsd = BLOB_OFFSET(sb, vs->data_off);
else
statevsd = NULL;
if (flags & SB_VOI_RELUPDATE) {
switch (voi_dtype) {
case VSD_DTYPE_INT_S32:
voival->int32.s32 +=
VSD(voistate, statevsd)->prev.int32.s32;
break;
case VSD_DTYPE_INT_U32:
voival->int32.u32 +=
VSD(voistate, statevsd)->prev.int32.u32;
break;
case VSD_DTYPE_INT_S64:
voival->int64.s64 +=
VSD(voistate, statevsd)->prev.int64.s64;
break;
case VSD_DTYPE_INT_U64:
voival->int64.u64 +=
VSD(voistate, statevsd)->prev.int64.u64;
break;
case VSD_DTYPE_INT_SLONG:
voival->intlong.slong +=
VSD(voistate, statevsd)->prev.intlong.slong;
break;
case VSD_DTYPE_INT_ULONG:
voival->intlong.ulong +=
VSD(voistate, statevsd)->prev.intlong.ulong;
break;
case VSD_DTYPE_Q_S32:
error = Q_QADDQ(&voival->q32.sq32,
VSD(voistate, statevsd)->prev.q32.sq32);
break;
case VSD_DTYPE_Q_U32:
error = Q_QADDQ(&voival->q32.uq32,
VSD(voistate, statevsd)->prev.q32.uq32);
break;
case VSD_DTYPE_Q_S64:
error = Q_QADDQ(&voival->q64.sq64,
VSD(voistate, statevsd)->prev.q64.sq64);
break;
case VSD_DTYPE_Q_U64:
error = Q_QADDQ(&voival->q64.uq64,
VSD(voistate, statevsd)->prev.q64.uq64);
break;
default:
KASSERT(0, ("Unknown VOI data type %d", voi_dtype));
break;
}
}
if (error)
return (error);
for (i = v->voistatmaxid; i > 0; i--) {
vs = &((struct voistat *)BLOB_OFFSET(sb, v->stats_off))[i];
if (vs->stype < 0)
continue;
vsd = BLOB_OFFSET(sb, vs->data_off);
switch (vs->stype) {
case VS_STYPE_MAX:
tmperr = stats_v1_voi_update_max(voi_dtype, voival,
vs, vsd);
break;
case VS_STYPE_MIN:
tmperr = stats_v1_voi_update_min(voi_dtype, voival,
vs, vsd);
break;
case VS_STYPE_SUM:
tmperr = stats_v1_voi_update_sum(voi_dtype, voival,
vs, vsd);
break;
case VS_STYPE_HIST:
tmperr = stats_v1_voi_update_hist(voi_dtype, voival,
vs, vsd);
break;
case VS_STYPE_TDGST:
tmperr = stats_v1_voi_update_tdgst(voi_dtype, voival,
vs, vsd);
break;
default:
KASSERT(0, ("Unknown VOI stat type %d", vs->stype));
break;
}
if (tmperr) {
error = tmperr;
VS_INCERRS(vs);
}
}
if (statevsd) {
switch (voi_dtype) {
case VSD_DTYPE_INT_S32:
VSD(voistate, statevsd)->prev.int32.s32 =
voival->int32.s32;
break;
case VSD_DTYPE_INT_U32:
VSD(voistate, statevsd)->prev.int32.u32 =
voival->int32.u32;
break;
case VSD_DTYPE_INT_S64:
VSD(voistate, statevsd)->prev.int64.s64 =
voival->int64.s64;
break;
case VSD_DTYPE_INT_U64:
VSD(voistate, statevsd)->prev.int64.u64 =
voival->int64.u64;
break;
case VSD_DTYPE_INT_SLONG:
VSD(voistate, statevsd)->prev.intlong.slong =
voival->intlong.slong;
break;
case VSD_DTYPE_INT_ULONG:
VSD(voistate, statevsd)->prev.intlong.ulong =
voival->intlong.ulong;
break;
case VSD_DTYPE_Q_S32:
error = Q_QCPYVALQ(
&VSD(voistate, statevsd)->prev.q32.sq32,
voival->q32.sq32);
break;
case VSD_DTYPE_Q_U32:
error = Q_QCPYVALQ(
&VSD(voistate, statevsd)->prev.q32.uq32,
voival->q32.uq32);
break;
case VSD_DTYPE_Q_S64:
error = Q_QCPYVALQ(
&VSD(voistate, statevsd)->prev.q64.sq64,
voival->q64.sq64);
break;
case VSD_DTYPE_Q_U64:
error = Q_QCPYVALQ(
&VSD(voistate, statevsd)->prev.q64.uq64,
voival->q64.uq64);
break;
default:
KASSERT(0, ("Unknown VOI data type %d", voi_dtype));
break;
}
}
return (error);
}
#ifdef _KERNEL
static void
stats_init(void *arg)
{
}
SYSINIT(stats, SI_SUB_KDTRACE, SI_ORDER_FIRST, stats_init, NULL);
/*
* Sysctl handler to display the list of available stats templates.
*/
static int
stats_tpl_list_available(SYSCTL_HANDLER_ARGS)
{
struct sbuf *s;
int err, i;
err = 0;
/* We can tolerate ntpl being stale, so do not take the lock. */
s = sbuf_new(NULL, NULL, /* +1 per tpl for , */
ntpl * (STATS_TPL_MAX_STR_SPEC_LEN + 1), SBUF_FIXEDLEN);
if (s == NULL)
return (ENOMEM);
TPL_LIST_RLOCK();
for (i = 0; i < ntpl; i++) {
err = sbuf_printf(s, "%s\"%s\":%u", i ? "," : "",
tpllist[i]->mb->tplname, tpllist[i]->mb->tplhash);
if (err) {
/* Sbuf overflow condition. */
err = EOVERFLOW;
break;
}
}
TPL_LIST_RUNLOCK();
if (!err) {
sbuf_finish(s);
err = sysctl_handle_string(oidp, sbuf_data(s), 0, req);
}
sbuf_delete(s);
return (err);
}
/*
* Called by subsystem-specific sysctls to report and/or parse the list of
* templates being sampled and their sampling rates. A stats_tpl_sr_cb_t
* conformant function pointer must be passed in as arg1, which is used to
* interact with the subsystem's stats template sample rates list. If arg2 > 0,
* a zero-initialised allocation of arg2-sized contextual memory is
* heap-allocated and passed in to all subsystem callbacks made during the
* operation of stats_tpl_sample_rates().
*
* XXXLAS: Assumes templates are never removed, which is currently true but may
* need to be reworked in future if dynamic template management becomes a
* requirement e.g. to support kernel module based templates.
*/
int
stats_tpl_sample_rates(SYSCTL_HANDLER_ARGS)
{
char kvpair_fmt[16], tplspec_fmt[16];
char tpl_spec[STATS_TPL_MAX_STR_SPEC_LEN];
char tpl_name[TPL_MAX_NAME_LEN + 2]; /* +2 for "" */
stats_tpl_sr_cb_t subsys_cb;
void *subsys_ctx;
char *buf, *new_rates_usr_str, *tpl_name_p;
struct stats_tpl_sample_rate *rates;
struct sbuf *s, _s;
uint32_t cum_pct, pct, tpl_hash;
int err, i, off, len, newlen, nrates;
buf = NULL;
rates = NULL;
err = nrates = 0;
subsys_cb = (stats_tpl_sr_cb_t)arg1;
KASSERT(subsys_cb != NULL, ("%s: subsys_cb == arg1 == NULL", __func__));
if (arg2 > 0)
subsys_ctx = malloc(arg2, M_TEMP, M_WAITOK | M_ZERO);
else
subsys_ctx = NULL;
/* Grab current count of subsystem rates. */
err = subsys_cb(TPL_SR_UNLOCKED_GET, NULL, &nrates, subsys_ctx);
if (err)
goto done;
/* +1 to ensure we can append '\0' post copyin, +5 per rate for =nnn, */
len = max(req->newlen + 1, nrates * (STATS_TPL_MAX_STR_SPEC_LEN + 5));
if (req->oldptr != NULL || req->newptr != NULL)
buf = malloc(len, M_TEMP, M_WAITOK);
if (req->oldptr != NULL) {
if (nrates == 0) {
/* No rates, so return an empty string via oldptr. */
err = SYSCTL_OUT(req, "", 1);
if (err)
goto done;
goto process_new;
}
s = sbuf_new(&_s, buf, len, SBUF_FIXEDLEN | SBUF_INCLUDENUL);
/* Grab locked count of, and ptr to, subsystem rates. */
err = subsys_cb(TPL_SR_RLOCKED_GET, &rates, &nrates,
subsys_ctx);
if (err)
goto done;
TPL_LIST_RLOCK();
for (i = 0; i < nrates && !err; i++) {
err = sbuf_printf(s, "%s\"%s\":%u=%u", i ? "," : "",
tpllist[rates[i].tpl_slot_id]->mb->tplname,
tpllist[rates[i].tpl_slot_id]->mb->tplhash,
rates[i].tpl_sample_pct);
}
TPL_LIST_RUNLOCK();
/* Tell subsystem that we're done with its rates list. */
err = subsys_cb(TPL_SR_RUNLOCK, &rates, &nrates, subsys_ctx);
if (err)
goto done;
err = sbuf_finish(s);
if (err)
goto done; /* We lost a race for buf to be too small. */
/* Return the rendered string data via oldptr. */
err = SYSCTL_OUT(req, sbuf_data(s), sbuf_len(s));
} else {
/* Return the upper bound size for buffer sizing requests. */
err = SYSCTL_OUT(req, NULL, len);
}
process_new:
if (err || req->newptr == NULL)
goto done;
newlen = req->newlen - req->newidx;
err = SYSCTL_IN(req, buf, newlen);
if (err)
goto done;
/*
* Initialise format strings at run time.
*
* Write the max template spec string length into the
* template_spec=percent key-value pair parsing format string as:
* " %<width>[^=]=%u %n"
*
* Write the max template name string length into the tplname:tplhash
* parsing format string as:
* "%<width>[^:]:%u"
*
* Subtract 1 for \0 appended by sscanf().
*/
sprintf(kvpair_fmt, " %%%zu[^=]=%%u %%n", sizeof(tpl_spec) - 1);
sprintf(tplspec_fmt, "%%%zu[^:]:%%u", sizeof(tpl_name) - 1);
/*
* Parse each CSV key-value pair specifying a template and its sample
* percentage. Whitespace either side of a key-value pair is ignored.
* Templates can be specified by name, hash, or name and hash per the
* following formats (chars in [] are optional):
* ["]<tplname>["]=<percent>
* :hash=pct
* ["]<tplname>["]:hash=<percent>
*/
cum_pct = nrates = 0;
rates = NULL;
buf[newlen] = '\0'; /* buf is at least newlen+1 in size. */
new_rates_usr_str = buf;
while (isspace(*new_rates_usr_str))
new_rates_usr_str++; /* Skip leading whitespace. */
while (*new_rates_usr_str != '\0') {
tpl_name_p = tpl_name;
tpl_name[0] = '\0';
tpl_hash = 0;
off = 0;
/*
* Parse key-value pair which must perform 2 conversions, then
* parse the template spec to extract either name, hash, or name
* and hash depending on the three possible spec formats. The
* tplspec_fmt format specifier parses name or name and hash
* template specs, while the ":%u" format specifier parses
* hash-only template specs. If parsing is successfull, ensure
* the cumulative sampling percentage does not exceed 100.
*/
err = EINVAL;
if (2 != sscanf(new_rates_usr_str, kvpair_fmt, tpl_spec, &pct,
&off))
break;
if ((1 > sscanf(tpl_spec, tplspec_fmt, tpl_name, &tpl_hash)) &&
(1 != sscanf(tpl_spec, ":%u", &tpl_hash)))
break;
if ((cum_pct += pct) > 100)
break;
err = 0;
/* Strip surrounding "" from template name if present. */
len = strlen(tpl_name);
if (len > 0) {
if (tpl_name[len - 1] == '"')
tpl_name[--len] = '\0';
if (tpl_name[0] == '"') {
tpl_name_p++;
len--;
}
}
rates = stats_realloc(rates, 0, /* oldsz is unused in kernel. */
(nrates + 1) * sizeof(*rates), M_WAITOK);
rates[nrates].tpl_slot_id =
stats_tpl_fetch_allocid(len ? tpl_name_p : NULL, tpl_hash);
if (rates[nrates].tpl_slot_id < 0) {
err = -rates[nrates].tpl_slot_id;
break;
}
rates[nrates].tpl_sample_pct = pct;
nrates++;
new_rates_usr_str += off;
if (*new_rates_usr_str != ',')
break; /* End-of-input or malformed. */
new_rates_usr_str++; /* Move past comma to next pair. */
}
if (!err) {
if ((new_rates_usr_str - buf) < newlen) {
/* Entire input has not been consumed. */
err = EINVAL;
} else {
/*
* Give subsystem the new rates. They'll return the
* appropriate rates pointer for us to garbage collect.
*/
err = subsys_cb(TPL_SR_PUT, &rates, &nrates,
subsys_ctx);
}
}
stats_free(rates);
done:
free(buf, M_TEMP);
free(subsys_ctx, M_TEMP);
return (err);
}
SYSCTL_NODE(_kern, OID_AUTO, stats, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
"stats(9) MIB");
SYSCTL_PROC(_kern_stats, OID_AUTO, templates,
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
stats_tpl_list_available, "A",
"list the name/hash of all available stats(9) templates");
#else /* ! _KERNEL */
static void __attribute__ ((constructor))
stats_constructor(void)
{
pthread_rwlock_init(&tpllistlock, NULL);
}
static void __attribute__ ((destructor))
stats_destructor(void)
{
pthread_rwlock_destroy(&tpllistlock);
}
#endif /* _KERNEL */
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