1296 lines
32 KiB
C
1296 lines
32 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005-2007 Joseph Koshy
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* Copyright (c) 2007 The FreeBSD Foundation
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* Copyright (c) 2018 Matthew Macy
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* All rights reserved.
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*
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* Portions of this software were developed by A. Joseph Koshy under
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* sponsorship from the FreeBSD Foundation and Google, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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/*
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* Logging code for hwpmc(4)
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <sys/kthread.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/pmc.h>
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#include <sys/pmckern.h>
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#include <sys/pmclog.h>
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#include <sys/proc.h>
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#include <sys/sched.h>
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#include <sys/signalvar.h>
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#include <sys/smp.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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#include <sys/unistd.h>
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#include <sys/vnode.h>
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#if defined(__i386__) || defined(__amd64__)
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#include <machine/clock.h>
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#endif
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#define curdomain PCPU_GET(domain)
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/*
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* Sysctl tunables
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*/
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SYSCTL_DECL(_kern_hwpmc);
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/*
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* kern.hwpmc.logbuffersize -- size of the per-cpu owner buffers.
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*/
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static int pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
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#if (__FreeBSD_version < 1100000)
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TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "logbuffersize", &pmclog_buffer_size);
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#endif
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SYSCTL_INT(_kern_hwpmc, OID_AUTO, logbuffersize, CTLFLAG_RDTUN,
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&pmclog_buffer_size, 0, "size of log buffers in kilobytes");
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/*
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* kern.hwpmc.nbuffer -- number of global log buffers
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*/
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static int pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
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#if (__FreeBSD_version < 1100000)
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TUNABLE_INT(PMC_SYSCTL_NAME_PREFIX "nbuffers", &pmc_nlogbuffers_pcpu);
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#endif
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SYSCTL_INT(_kern_hwpmc, OID_AUTO, nbuffers_pcpu, CTLFLAG_RDTUN,
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&pmc_nlogbuffers_pcpu, 0, "number of log buffers per cpu");
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/*
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* Global log buffer list and associated spin lock.
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*/
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static struct mtx pmc_kthread_mtx; /* sleep lock */
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#define PMCLOG_INIT_BUFFER_DESCRIPTOR(D, buf, domain) do { \
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(D)->plb_fence = ((char *) (buf)) + 1024*pmclog_buffer_size; \
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(D)->plb_base = (D)->plb_ptr = ((char *) (buf)); \
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(D)->plb_domain = domain; \
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} while (0)
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#define PMCLOG_RESET_BUFFER_DESCRIPTOR(D) do { \
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(D)->plb_ptr = (D)->plb_base; \
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} while (0)
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/*
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* Log file record constructors.
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*/
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#define _PMCLOG_TO_HEADER(T,L) \
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((PMCLOG_HEADER_MAGIC << 24) | \
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(PMCLOG_TYPE_ ## T << 16) | \
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((L) & 0xFFFF))
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/* reserve LEN bytes of space and initialize the entry header */
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#define _PMCLOG_RESERVE_SAFE(PO,TYPE,LEN,ACTION, TSC) do { \
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uint32_t *_le; \
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int _len = roundup((LEN), sizeof(uint32_t)); \
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struct pmclog_header *ph; \
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if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
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ACTION; \
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} \
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ph = (struct pmclog_header *)_le; \
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ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \
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ph->pl_tsc = (TSC); \
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_le += sizeof(*ph)/4 /* skip over timestamp */
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/* reserve LEN bytes of space and initialize the entry header */
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#define _PMCLOG_RESERVE(PO,TYPE,LEN,ACTION) do { \
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uint32_t *_le; \
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int _len = roundup((LEN), sizeof(uint32_t)); \
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uint64_t tsc; \
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struct pmclog_header *ph; \
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tsc = pmc_rdtsc(); \
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spinlock_enter(); \
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if ((_le = pmclog_reserve((PO), _len)) == NULL) { \
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spinlock_exit(); \
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ACTION; \
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} \
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ph = (struct pmclog_header *)_le; \
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ph->pl_header =_PMCLOG_TO_HEADER(TYPE,_len); \
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ph->pl_tsc = tsc; \
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_le += sizeof(*ph)/4 /* skip over timestamp */
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#define PMCLOG_RESERVE_SAFE(P,T,L,TSC) _PMCLOG_RESERVE_SAFE(P,T,L,return,TSC)
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#define PMCLOG_RESERVE(P,T,L) _PMCLOG_RESERVE(P,T,L,return)
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#define PMCLOG_RESERVE_WITH_ERROR(P,T,L) _PMCLOG_RESERVE(P,T,L, \
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error=ENOMEM;goto error)
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#define PMCLOG_EMIT32(V) do { *_le++ = (V); } while (0)
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#define PMCLOG_EMIT64(V) do { \
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*_le++ = (uint32_t) ((V) & 0xFFFFFFFF); \
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*_le++ = (uint32_t) (((V) >> 32) & 0xFFFFFFFF); \
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} while (0)
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/* Emit a string. Caution: does NOT update _le, so needs to be last */
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#define PMCLOG_EMITSTRING(S,L) do { bcopy((S), _le, (L)); } while (0)
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#define PMCLOG_EMITNULLSTRING(L) do { bzero(_le, (L)); } while (0)
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#define PMCLOG_DESPATCH_SAFE(PO) \
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pmclog_release((PO)); \
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} while (0)
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#define PMCLOG_DESPATCH_SCHED_LOCK(PO) \
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pmclog_release_flags((PO), 0); \
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} while (0)
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#define PMCLOG_DESPATCH(PO) \
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pmclog_release((PO)); \
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spinlock_exit(); \
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} while (0)
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#define PMCLOG_DESPATCH_SYNC(PO) \
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pmclog_schedule_io((PO), 1); \
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spinlock_exit(); \
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} while (0)
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#define TSDELTA 4
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/*
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* Assertions about the log file format.
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*/
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CTASSERT(sizeof(struct pmclog_callchain) == 7*4 + TSDELTA +
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PMC_CALLCHAIN_DEPTH_MAX*sizeof(uintfptr_t));
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CTASSERT(sizeof(struct pmclog_closelog) == 3*4 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_dropnotify) == 3*4 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_map_in) == PATH_MAX + TSDELTA +
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5*4 + sizeof(uintfptr_t));
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CTASSERT(offsetof(struct pmclog_map_in,pl_pathname) ==
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5*4 + TSDELTA + sizeof(uintfptr_t));
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CTASSERT(sizeof(struct pmclog_map_out) == 5*4 + 2*sizeof(uintfptr_t) + TSDELTA);
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CTASSERT(sizeof(struct pmclog_pmcallocate) == 9*4 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_pmcattach) == 5*4 + PATH_MAX + TSDELTA);
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CTASSERT(offsetof(struct pmclog_pmcattach,pl_pathname) == 5*4 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_pmcdetach) == 5*4 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_proccsw) == 7*4 + 8 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_procexec) == 5*4 + PATH_MAX +
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sizeof(uintfptr_t) + TSDELTA);
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CTASSERT(offsetof(struct pmclog_procexec,pl_pathname) == 5*4 + TSDELTA +
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sizeof(uintfptr_t));
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CTASSERT(sizeof(struct pmclog_procexit) == 5*4 + 8 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_procfork) == 5*4 + TSDELTA);
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CTASSERT(sizeof(struct pmclog_sysexit) == 6*4);
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CTASSERT(sizeof(struct pmclog_userdata) == 6*4);
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/*
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* Log buffer structure
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*/
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struct pmclog_buffer {
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TAILQ_ENTRY(pmclog_buffer) plb_next;
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char *plb_base;
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char *plb_ptr;
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char *plb_fence;
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uint16_t plb_domain;
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} __aligned(CACHE_LINE_SIZE);
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/*
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* Prototypes
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*/
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static int pmclog_get_buffer(struct pmc_owner *po);
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static void pmclog_loop(void *arg);
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static void pmclog_release(struct pmc_owner *po);
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static uint32_t *pmclog_reserve(struct pmc_owner *po, int length);
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static void pmclog_schedule_io(struct pmc_owner *po, int wakeup);
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static void pmclog_schedule_all(struct pmc_owner *po, int force);
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static void pmclog_stop_kthread(struct pmc_owner *po);
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/*
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* Helper functions
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*/
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static inline void
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pmc_plb_rele_unlocked(struct pmclog_buffer *plb)
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{
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TAILQ_INSERT_HEAD(&pmc_dom_hdrs[plb->plb_domain]->pdbh_head, plb, plb_next);
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}
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static inline void
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pmc_plb_rele(struct pmclog_buffer *plb)
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{
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mtx_lock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
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pmc_plb_rele_unlocked(plb);
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mtx_unlock_spin(&pmc_dom_hdrs[plb->plb_domain]->pdbh_mtx);
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}
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/*
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* Get a log buffer
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*/
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static int
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pmclog_get_buffer(struct pmc_owner *po)
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{
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struct pmclog_buffer *plb;
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int domain;
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KASSERT(po->po_curbuf[curcpu] == NULL,
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("[pmclog,%d] po=%p current buffer still valid", __LINE__, po));
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domain = curdomain;
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MPASS(pmc_dom_hdrs[domain]);
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mtx_lock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
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if ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL)
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TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
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mtx_unlock_spin(&pmc_dom_hdrs[domain]->pdbh_mtx);
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PMCDBG2(LOG,GTB,1, "po=%p plb=%p", po, plb);
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#ifdef HWPMC_DEBUG
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if (plb)
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KASSERT(plb->plb_ptr == plb->plb_base &&
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plb->plb_base < plb->plb_fence,
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("[pmclog,%d] po=%p buffer invariants: ptr=%p "
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"base=%p fence=%p", __LINE__, po, plb->plb_ptr,
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plb->plb_base, plb->plb_fence));
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#endif
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po->po_curbuf[curcpu] = plb;
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/* update stats */
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counter_u64_add(pmc_stats.pm_buffer_requests, 1);
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if (plb == NULL)
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counter_u64_add(pmc_stats.pm_buffer_requests_failed, 1);
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return (plb ? 0 : ENOMEM);
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}
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struct pmclog_proc_init_args {
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struct proc *kthr;
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struct pmc_owner *po;
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bool exit;
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bool acted;
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};
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int
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pmclog_proc_create(struct thread *td, void **handlep)
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{
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struct pmclog_proc_init_args *ia;
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int error;
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ia = malloc(sizeof(*ia), M_TEMP, M_WAITOK | M_ZERO);
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error = kproc_create(pmclog_loop, ia, &ia->kthr,
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RFHIGHPID, 0, "hwpmc: proc(%d)", td->td_proc->p_pid);
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if (error == 0)
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*handlep = ia;
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return (error);
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}
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void
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pmclog_proc_ignite(void *handle, struct pmc_owner *po)
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{
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struct pmclog_proc_init_args *ia;
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ia = handle;
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mtx_lock(&pmc_kthread_mtx);
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MPASS(!ia->acted);
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MPASS(ia->po == NULL);
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MPASS(!ia->exit);
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MPASS(ia->kthr != NULL);
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if (po == NULL) {
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ia->exit = true;
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} else {
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ia->po = po;
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KASSERT(po->po_kthread == NULL,
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("[pmclog,%d] po=%p kthread (%p) already present",
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__LINE__, po, po->po_kthread));
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po->po_kthread = ia->kthr;
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}
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wakeup(ia);
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while (!ia->acted)
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msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogw", 0);
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mtx_unlock(&pmc_kthread_mtx);
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free(ia, M_TEMP);
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}
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/*
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* Log handler loop.
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*
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* This function is executed by each pmc owner's helper thread.
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*/
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static void
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pmclog_loop(void *arg)
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{
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struct pmclog_proc_init_args *ia;
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struct pmc_owner *po;
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struct pmclog_buffer *lb;
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struct proc *p;
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struct ucred *ownercred;
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struct ucred *mycred;
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struct thread *td;
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sigset_t unb;
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struct uio auio;
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struct iovec aiov;
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size_t nbytes;
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int error;
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td = curthread;
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SIGEMPTYSET(unb);
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SIGADDSET(unb, SIGHUP);
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(void)kern_sigprocmask(td, SIG_UNBLOCK, &unb, NULL, 0);
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ia = arg;
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MPASS(ia->kthr == curproc);
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MPASS(!ia->acted);
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mtx_lock(&pmc_kthread_mtx);
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while (ia->po == NULL && !ia->exit)
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msleep(ia, &pmc_kthread_mtx, PWAIT, "pmclogi", 0);
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if (ia->exit) {
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ia->acted = true;
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wakeup(ia);
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mtx_unlock(&pmc_kthread_mtx);
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kproc_exit(0);
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}
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MPASS(ia->po != NULL);
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po = ia->po;
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ia->acted = true;
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wakeup(ia);
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mtx_unlock(&pmc_kthread_mtx);
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ia = NULL;
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p = po->po_owner;
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mycred = td->td_ucred;
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PROC_LOCK(p);
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ownercred = crhold(p->p_ucred);
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PROC_UNLOCK(p);
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PMCDBG2(LOG,INI,1, "po=%p kt=%p", po, po->po_kthread);
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KASSERT(po->po_kthread == curthread->td_proc,
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("[pmclog,%d] proc mismatch po=%p po/kt=%p curproc=%p", __LINE__,
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po, po->po_kthread, curthread->td_proc));
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lb = NULL;
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/*
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* Loop waiting for I/O requests to be added to the owner
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* struct's queue. The loop is exited when the log file
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* is deconfigured.
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*/
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mtx_lock(&pmc_kthread_mtx);
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for (;;) {
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/* check if we've been asked to exit */
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if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
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break;
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if (lb == NULL) { /* look for a fresh buffer to write */
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mtx_lock_spin(&po->po_mtx);
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if ((lb = TAILQ_FIRST(&po->po_logbuffers)) == NULL) {
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mtx_unlock_spin(&po->po_mtx);
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/* No more buffers and shutdown required. */
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if (po->po_flags & PMC_PO_SHUTDOWN)
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break;
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(void) msleep(po, &pmc_kthread_mtx, PWAIT,
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"pmcloop", 250);
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continue;
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}
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TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
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mtx_unlock_spin(&po->po_mtx);
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}
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mtx_unlock(&pmc_kthread_mtx);
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/* process the request */
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PMCDBG3(LOG,WRI,2, "po=%p base=%p ptr=%p", po,
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lb->plb_base, lb->plb_ptr);
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/* change our thread's credentials before issuing the I/O */
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aiov.iov_base = lb->plb_base;
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aiov.iov_len = nbytes = lb->plb_ptr - lb->plb_base;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = -1;
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auio.uio_resid = nbytes;
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auio.uio_rw = UIO_WRITE;
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auio.uio_segflg = UIO_SYSSPACE;
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auio.uio_td = td;
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/* switch thread credentials -- see kern_ktrace.c */
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td->td_ucred = ownercred;
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error = fo_write(po->po_file, &auio, ownercred, 0, td);
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td->td_ucred = mycred;
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if (error) {
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/* XXX some errors are recoverable */
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/* send a SIGIO to the owner and exit */
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PROC_LOCK(p);
|
|
kern_psignal(p, SIGIO);
|
|
PROC_UNLOCK(p);
|
|
|
|
mtx_lock(&pmc_kthread_mtx);
|
|
|
|
po->po_error = error; /* save for flush log */
|
|
|
|
PMCDBG2(LOG,WRI,2, "po=%p error=%d", po, error);
|
|
|
|
break;
|
|
}
|
|
|
|
mtx_lock(&pmc_kthread_mtx);
|
|
|
|
/* put the used buffer back into the global pool */
|
|
PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
|
|
|
|
pmc_plb_rele(lb);
|
|
lb = NULL;
|
|
}
|
|
|
|
wakeup_one(po->po_kthread);
|
|
po->po_kthread = NULL;
|
|
|
|
mtx_unlock(&pmc_kthread_mtx);
|
|
|
|
/* return the current I/O buffer to the global pool */
|
|
if (lb) {
|
|
PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
|
|
|
|
pmc_plb_rele(lb);
|
|
}
|
|
|
|
/*
|
|
* Exit this thread, signalling the waiter
|
|
*/
|
|
|
|
crfree(ownercred);
|
|
|
|
kproc_exit(0);
|
|
}
|
|
|
|
/*
|
|
* Release and log entry and schedule an I/O if needed.
|
|
*/
|
|
|
|
static void
|
|
pmclog_release_flags(struct pmc_owner *po, int wakeup)
|
|
{
|
|
struct pmclog_buffer *plb;
|
|
|
|
plb = po->po_curbuf[curcpu];
|
|
KASSERT(plb->plb_ptr >= plb->plb_base,
|
|
("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
|
|
po, plb->plb_ptr, plb->plb_base));
|
|
KASSERT(plb->plb_ptr <= plb->plb_fence,
|
|
("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
|
|
po, plb->plb_ptr, plb->plb_fence));
|
|
|
|
/* schedule an I/O if we've filled a buffer */
|
|
if (plb->plb_ptr >= plb->plb_fence)
|
|
pmclog_schedule_io(po, wakeup);
|
|
|
|
PMCDBG1(LOG,REL,1, "po=%p", po);
|
|
}
|
|
|
|
static void
|
|
pmclog_release(struct pmc_owner *po)
|
|
{
|
|
|
|
pmclog_release_flags(po, 1);
|
|
}
|
|
|
|
|
|
/*
|
|
* Attempt to reserve 'length' bytes of space in an owner's log
|
|
* buffer. The function returns a pointer to 'length' bytes of space
|
|
* if there was enough space or returns NULL if no space was
|
|
* available. Non-null returns do so with the po mutex locked. The
|
|
* caller must invoke pmclog_release() on the pmc owner structure
|
|
* when done.
|
|
*/
|
|
|
|
static uint32_t *
|
|
pmclog_reserve(struct pmc_owner *po, int length)
|
|
{
|
|
uintptr_t newptr, oldptr;
|
|
struct pmclog_buffer *plb, **pplb;
|
|
|
|
PMCDBG2(LOG,ALL,1, "po=%p len=%d", po, length);
|
|
|
|
KASSERT(length % sizeof(uint32_t) == 0,
|
|
("[pmclog,%d] length not a multiple of word size", __LINE__));
|
|
|
|
/* No more data when shutdown in progress. */
|
|
if (po->po_flags & PMC_PO_SHUTDOWN)
|
|
return (NULL);
|
|
|
|
pplb = &po->po_curbuf[curcpu];
|
|
if (*pplb == NULL && pmclog_get_buffer(po) != 0)
|
|
goto fail;
|
|
|
|
KASSERT(*pplb != NULL,
|
|
("[pmclog,%d] po=%p no current buffer", __LINE__, po));
|
|
|
|
plb = *pplb;
|
|
KASSERT(plb->plb_ptr >= plb->plb_base &&
|
|
plb->plb_ptr <= plb->plb_fence,
|
|
("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
|
|
__LINE__, po, plb->plb_ptr, plb->plb_base,
|
|
plb->plb_fence));
|
|
|
|
oldptr = (uintptr_t) plb->plb_ptr;
|
|
newptr = oldptr + length;
|
|
|
|
KASSERT(oldptr != (uintptr_t) NULL,
|
|
("[pmclog,%d] po=%p Null log buffer pointer", __LINE__, po));
|
|
|
|
/*
|
|
* If we have space in the current buffer, return a pointer to
|
|
* available space with the PO structure locked.
|
|
*/
|
|
if (newptr <= (uintptr_t) plb->plb_fence) {
|
|
plb->plb_ptr = (char *) newptr;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Otherwise, schedule the current buffer for output and get a
|
|
* fresh buffer.
|
|
*/
|
|
pmclog_schedule_io(po, 0);
|
|
|
|
if (pmclog_get_buffer(po) != 0)
|
|
goto fail;
|
|
|
|
plb = *pplb;
|
|
KASSERT(plb != NULL,
|
|
("[pmclog,%d] po=%p no current buffer", __LINE__, po));
|
|
|
|
KASSERT(plb->plb_ptr != NULL,
|
|
("[pmclog,%d] null return from pmc_get_log_buffer", __LINE__));
|
|
|
|
KASSERT(plb->plb_ptr == plb->plb_base &&
|
|
plb->plb_ptr <= plb->plb_fence,
|
|
("[pmclog,%d] po=%p buffer invariants: ptr=%p base=%p fence=%p",
|
|
__LINE__, po, plb->plb_ptr, plb->plb_base,
|
|
plb->plb_fence));
|
|
|
|
oldptr = (uintptr_t) plb->plb_ptr;
|
|
|
|
done:
|
|
return ((uint32_t *) oldptr);
|
|
fail:
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Schedule an I/O.
|
|
*
|
|
* Transfer the current buffer to the helper kthread.
|
|
*/
|
|
|
|
static void
|
|
pmclog_schedule_io(struct pmc_owner *po, int wakeup)
|
|
{
|
|
struct pmclog_buffer *plb;
|
|
|
|
plb = po->po_curbuf[curcpu];
|
|
po->po_curbuf[curcpu] = NULL;
|
|
KASSERT(plb != NULL,
|
|
("[pmclog,%d] schedule_io with null buffer po=%p", __LINE__, po));
|
|
KASSERT(plb->plb_ptr >= plb->plb_base,
|
|
("[pmclog,%d] buffer invariants po=%p ptr=%p base=%p", __LINE__,
|
|
po, plb->plb_ptr, plb->plb_base));
|
|
KASSERT(plb->plb_ptr <= plb->plb_fence,
|
|
("[pmclog,%d] buffer invariants po=%p ptr=%p fenc=%p", __LINE__,
|
|
po, plb->plb_ptr, plb->plb_fence));
|
|
|
|
PMCDBG1(LOG,SIO, 1, "po=%p", po);
|
|
|
|
/*
|
|
* Add the current buffer to the tail of the buffer list and
|
|
* wakeup the helper.
|
|
*/
|
|
mtx_lock_spin(&po->po_mtx);
|
|
TAILQ_INSERT_TAIL(&po->po_logbuffers, plb, plb_next);
|
|
mtx_unlock_spin(&po->po_mtx);
|
|
if (wakeup)
|
|
wakeup_one(po);
|
|
}
|
|
|
|
/*
|
|
* Stop the helper kthread.
|
|
*/
|
|
|
|
static void
|
|
pmclog_stop_kthread(struct pmc_owner *po)
|
|
{
|
|
|
|
mtx_lock(&pmc_kthread_mtx);
|
|
po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
|
|
if (po->po_kthread != NULL) {
|
|
PROC_LOCK(po->po_kthread);
|
|
kern_psignal(po->po_kthread, SIGHUP);
|
|
PROC_UNLOCK(po->po_kthread);
|
|
}
|
|
wakeup_one(po);
|
|
while (po->po_kthread)
|
|
msleep(po->po_kthread, &pmc_kthread_mtx, PPAUSE, "pmckstp", 0);
|
|
mtx_unlock(&pmc_kthread_mtx);
|
|
}
|
|
|
|
/*
|
|
* Public functions
|
|
*/
|
|
|
|
/*
|
|
* Configure a log file for pmc owner 'po'.
|
|
*
|
|
* Parameter 'logfd' is a file handle referencing an open file in the
|
|
* owner process. This file needs to have been opened for writing.
|
|
*/
|
|
|
|
int
|
|
pmclog_configure_log(struct pmc_mdep *md, struct pmc_owner *po, int logfd)
|
|
{
|
|
struct proc *p;
|
|
struct timespec ts;
|
|
uint64_t tsc;
|
|
int error;
|
|
|
|
sx_assert(&pmc_sx, SA_XLOCKED);
|
|
PMCDBG2(LOG,CFG,1, "config po=%p logfd=%d", po, logfd);
|
|
|
|
p = po->po_owner;
|
|
|
|
/* return EBUSY if a log file was already present */
|
|
if (po->po_flags & PMC_PO_OWNS_LOGFILE)
|
|
return (EBUSY);
|
|
|
|
KASSERT(po->po_file == NULL,
|
|
("[pmclog,%d] po=%p file (%p) already present", __LINE__, po,
|
|
po->po_file));
|
|
|
|
/* get a reference to the file state */
|
|
error = fget_write(curthread, logfd, &cap_write_rights, &po->po_file);
|
|
if (error)
|
|
goto error;
|
|
|
|
/* mark process as owning a log file */
|
|
po->po_flags |= PMC_PO_OWNS_LOGFILE;
|
|
|
|
/* mark process as using HWPMCs */
|
|
PROC_LOCK(p);
|
|
p->p_flag |= P_HWPMC;
|
|
PROC_UNLOCK(p);
|
|
nanotime(&ts);
|
|
tsc = pmc_rdtsc();
|
|
/* create a log initialization entry */
|
|
PMCLOG_RESERVE_WITH_ERROR(po, INITIALIZE,
|
|
sizeof(struct pmclog_initialize));
|
|
PMCLOG_EMIT32(PMC_VERSION);
|
|
PMCLOG_EMIT32(md->pmd_cputype);
|
|
#if defined(__i386__) || defined(__amd64__)
|
|
PMCLOG_EMIT64(tsc_freq);
|
|
#else
|
|
/* other architectures will need to fill this in */
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMIT32(0);
|
|
#endif
|
|
memcpy(_le, &ts, sizeof(ts));
|
|
_le += sizeof(ts)/4;
|
|
PMCLOG_EMITSTRING(pmc_cpuid, PMC_CPUID_LEN);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
|
|
return (0);
|
|
|
|
error:
|
|
KASSERT(po->po_kthread == NULL, ("[pmclog,%d] po=%p kthread not "
|
|
"stopped", __LINE__, po));
|
|
|
|
if (po->po_file)
|
|
(void) fdrop(po->po_file, curthread);
|
|
po->po_file = NULL; /* clear file and error state */
|
|
po->po_error = 0;
|
|
po->po_flags &= ~PMC_PO_OWNS_LOGFILE;
|
|
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* De-configure a log file. This will throw away any buffers queued
|
|
* for this owner process.
|
|
*/
|
|
|
|
int
|
|
pmclog_deconfigure_log(struct pmc_owner *po)
|
|
{
|
|
int error;
|
|
struct pmclog_buffer *lb;
|
|
|
|
PMCDBG1(LOG,CFG,1, "de-config po=%p", po);
|
|
|
|
if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0)
|
|
return (EINVAL);
|
|
|
|
KASSERT(po->po_sscount == 0,
|
|
("[pmclog,%d] po=%p still owning SS PMCs", __LINE__, po));
|
|
KASSERT(po->po_file != NULL,
|
|
("[pmclog,%d] po=%p no log file", __LINE__, po));
|
|
|
|
/* stop the kthread, this will reset the 'OWNS_LOGFILE' flag */
|
|
pmclog_stop_kthread(po);
|
|
|
|
KASSERT(po->po_kthread == NULL,
|
|
("[pmclog,%d] po=%p kthread not stopped", __LINE__, po));
|
|
|
|
/* return all queued log buffers to the global pool */
|
|
while ((lb = TAILQ_FIRST(&po->po_logbuffers)) != NULL) {
|
|
TAILQ_REMOVE(&po->po_logbuffers, lb, plb_next);
|
|
PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
|
|
pmc_plb_rele(lb);
|
|
}
|
|
for (int i = 0; i < mp_ncpus; i++) {
|
|
thread_lock(curthread);
|
|
sched_bind(curthread, i);
|
|
thread_unlock(curthread);
|
|
/* return the 'current' buffer to the global pool */
|
|
if ((lb = po->po_curbuf[curcpu]) != NULL) {
|
|
PMCLOG_RESET_BUFFER_DESCRIPTOR(lb);
|
|
pmc_plb_rele(lb);
|
|
}
|
|
}
|
|
thread_lock(curthread);
|
|
sched_unbind(curthread);
|
|
thread_unlock(curthread);
|
|
|
|
/* drop a reference to the fd */
|
|
if (po->po_file != NULL) {
|
|
error = fdrop(po->po_file, curthread);
|
|
po->po_file = NULL;
|
|
} else
|
|
error = 0;
|
|
po->po_error = 0;
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Flush a process' log buffer.
|
|
*/
|
|
|
|
int
|
|
pmclog_flush(struct pmc_owner *po, int force)
|
|
{
|
|
int error;
|
|
|
|
PMCDBG1(LOG,FLS,1, "po=%p", po);
|
|
|
|
/*
|
|
* If there is a pending error recorded by the logger thread,
|
|
* return that.
|
|
*/
|
|
if (po->po_error)
|
|
return (po->po_error);
|
|
|
|
error = 0;
|
|
|
|
/*
|
|
* Check that we do have an active log file.
|
|
*/
|
|
mtx_lock(&pmc_kthread_mtx);
|
|
if ((po->po_flags & PMC_PO_OWNS_LOGFILE) == 0) {
|
|
error = EINVAL;
|
|
goto error;
|
|
}
|
|
|
|
pmclog_schedule_all(po, force);
|
|
error:
|
|
mtx_unlock(&pmc_kthread_mtx);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
pmclog_schedule_one_cond(struct pmc_owner *po, int force)
|
|
{
|
|
struct pmclog_buffer *plb;
|
|
int cpu;
|
|
|
|
spinlock_enter();
|
|
cpu = curcpu;
|
|
/* tell hardclock not to run again */
|
|
if (PMC_CPU_HAS_SAMPLES(cpu))
|
|
PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL);
|
|
if (force)
|
|
pmc_flush_samples(cpu);
|
|
plb = po->po_curbuf[cpu];
|
|
if (plb && plb->plb_ptr != plb->plb_base)
|
|
pmclog_schedule_io(po, 1);
|
|
spinlock_exit();
|
|
}
|
|
|
|
static void
|
|
pmclog_schedule_all(struct pmc_owner *po, int force)
|
|
{
|
|
/*
|
|
* Schedule the current buffer if any and not empty.
|
|
*/
|
|
for (int i = 0; i < mp_ncpus; i++) {
|
|
thread_lock(curthread);
|
|
sched_bind(curthread, i);
|
|
thread_unlock(curthread);
|
|
pmclog_schedule_one_cond(po, force);
|
|
}
|
|
thread_lock(curthread);
|
|
sched_unbind(curthread);
|
|
thread_unlock(curthread);
|
|
}
|
|
|
|
int
|
|
pmclog_close(struct pmc_owner *po)
|
|
{
|
|
|
|
PMCDBG1(LOG,CLO,1, "po=%p", po);
|
|
|
|
pmclog_process_closelog(po);
|
|
|
|
mtx_lock(&pmc_kthread_mtx);
|
|
/*
|
|
* Initiate shutdown: no new data queued,
|
|
* thread will close file on last block.
|
|
*/
|
|
po->po_flags |= PMC_PO_SHUTDOWN;
|
|
/* give time for all to see */
|
|
DELAY(50);
|
|
|
|
/*
|
|
* Schedule the current buffer.
|
|
*/
|
|
pmclog_schedule_all(po, 0);
|
|
wakeup_one(po);
|
|
|
|
mtx_unlock(&pmc_kthread_mtx);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pmclog_process_callchain(struct pmc *pm, struct pmc_sample *ps)
|
|
{
|
|
int n, recordlen;
|
|
uint32_t flags;
|
|
struct pmc_owner *po;
|
|
|
|
PMCDBG3(LOG,SAM,1,"pm=%p pid=%d n=%d", pm, ps->ps_pid,
|
|
ps->ps_nsamples);
|
|
|
|
recordlen = offsetof(struct pmclog_callchain, pl_pc) +
|
|
ps->ps_nsamples * sizeof(uintfptr_t);
|
|
po = pm->pm_owner;
|
|
flags = PMC_CALLCHAIN_TO_CPUFLAGS(ps->ps_cpu,ps->ps_flags);
|
|
PMCLOG_RESERVE_SAFE(po, CALLCHAIN, recordlen, ps->ps_tsc);
|
|
PMCLOG_EMIT32(ps->ps_pid);
|
|
PMCLOG_EMIT32(ps->ps_tid);
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(flags);
|
|
for (n = 0; n < ps->ps_nsamples; n++)
|
|
PMCLOG_EMITADDR(ps->ps_pc[n]);
|
|
PMCLOG_DESPATCH_SAFE(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_closelog(struct pmc_owner *po)
|
|
{
|
|
PMCLOG_RESERVE(po,CLOSELOG,sizeof(struct pmclog_closelog));
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_dropnotify(struct pmc_owner *po)
|
|
{
|
|
PMCLOG_RESERVE(po,DROPNOTIFY,sizeof(struct pmclog_dropnotify));
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_map_in(struct pmc_owner *po, pid_t pid, uintfptr_t start,
|
|
const char *path)
|
|
{
|
|
int pathlen, recordlen;
|
|
|
|
KASSERT(path != NULL, ("[pmclog,%d] map-in, null path", __LINE__));
|
|
|
|
pathlen = strlen(path) + 1; /* #bytes for path name */
|
|
recordlen = offsetof(struct pmclog_map_in, pl_pathname) +
|
|
pathlen;
|
|
|
|
PMCLOG_RESERVE(po, MAP_IN, recordlen);
|
|
PMCLOG_EMIT32(pid);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMITADDR(start);
|
|
PMCLOG_EMITSTRING(path,pathlen);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_map_out(struct pmc_owner *po, pid_t pid, uintfptr_t start,
|
|
uintfptr_t end)
|
|
{
|
|
KASSERT(start <= end, ("[pmclog,%d] start > end", __LINE__));
|
|
|
|
PMCLOG_RESERVE(po, MAP_OUT, sizeof(struct pmclog_map_out));
|
|
PMCLOG_EMIT32(pid);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMITADDR(start);
|
|
PMCLOG_EMITADDR(end);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_pmcallocate(struct pmc *pm)
|
|
{
|
|
struct pmc_owner *po;
|
|
struct pmc_soft *ps;
|
|
|
|
po = pm->pm_owner;
|
|
|
|
PMCDBG1(LOG,ALL,1, "pm=%p", pm);
|
|
|
|
if (PMC_TO_CLASS(pm) == PMC_CLASS_SOFT) {
|
|
PMCLOG_RESERVE(po, PMCALLOCATEDYN,
|
|
sizeof(struct pmclog_pmcallocatedyn));
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(pm->pm_event);
|
|
PMCLOG_EMIT32(pm->pm_flags);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount);
|
|
ps = pmc_soft_ev_acquire(pm->pm_event);
|
|
if (ps != NULL)
|
|
PMCLOG_EMITSTRING(ps->ps_ev.pm_ev_name,PMC_NAME_MAX);
|
|
else
|
|
PMCLOG_EMITNULLSTRING(PMC_NAME_MAX);
|
|
pmc_soft_ev_release(ps);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
} else {
|
|
PMCLOG_RESERVE(po, PMCALLOCATE,
|
|
sizeof(struct pmclog_pmcallocate));
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(pm->pm_event);
|
|
PMCLOG_EMIT32(pm->pm_flags);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMIT64(pm->pm_sc.pm_reloadcount);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
}
|
|
}
|
|
|
|
void
|
|
pmclog_process_pmcattach(struct pmc *pm, pid_t pid, char *path)
|
|
{
|
|
int pathlen, recordlen;
|
|
struct pmc_owner *po;
|
|
|
|
PMCDBG2(LOG,ATT,1,"pm=%p pid=%d", pm, pid);
|
|
|
|
po = pm->pm_owner;
|
|
|
|
pathlen = strlen(path) + 1; /* #bytes for the string */
|
|
recordlen = offsetof(struct pmclog_pmcattach, pl_pathname) + pathlen;
|
|
|
|
PMCLOG_RESERVE(po, PMCATTACH, recordlen);
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(pid);
|
|
PMCLOG_EMITSTRING(path, pathlen);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_pmcdetach(struct pmc *pm, pid_t pid)
|
|
{
|
|
struct pmc_owner *po;
|
|
|
|
PMCDBG2(LOG,ATT,1,"!pm=%p pid=%d", pm, pid);
|
|
|
|
po = pm->pm_owner;
|
|
|
|
PMCLOG_RESERVE(po, PMCDETACH, sizeof(struct pmclog_pmcdetach));
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(pid);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_proccreate(struct pmc_owner *po, struct proc *p, int sync)
|
|
{
|
|
if (sync) {
|
|
PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate));
|
|
PMCLOG_EMIT32(p->p_pid);
|
|
PMCLOG_EMIT32(p->p_flag);
|
|
PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
} else {
|
|
PMCLOG_RESERVE(po, PROC_CREATE, sizeof(struct pmclog_proccreate));
|
|
PMCLOG_EMIT32(p->p_pid);
|
|
PMCLOG_EMIT32(p->p_flag);
|
|
PMCLOG_EMITSTRING(p->p_comm, MAXCOMLEN+1);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Log a context switch event to the log file.
|
|
*/
|
|
|
|
void
|
|
pmclog_process_proccsw(struct pmc *pm, struct pmc_process *pp, pmc_value_t v, struct thread *td)
|
|
{
|
|
struct pmc_owner *po;
|
|
|
|
KASSERT(pm->pm_flags & PMC_F_LOG_PROCCSW,
|
|
("[pmclog,%d] log-process-csw called gratuitously", __LINE__));
|
|
|
|
PMCDBG3(LOG,SWO,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
|
|
v);
|
|
|
|
po = pm->pm_owner;
|
|
|
|
PMCLOG_RESERVE_SAFE(po, PROCCSW, sizeof(struct pmclog_proccsw), pmc_rdtsc());
|
|
PMCLOG_EMIT64(v);
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(pp->pp_proc->p_pid);
|
|
PMCLOG_EMIT32(td->td_tid);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_DESPATCH_SCHED_LOCK(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_procexec(struct pmc_owner *po, pmc_id_t pmid, pid_t pid,
|
|
uintfptr_t startaddr, char *path)
|
|
{
|
|
int pathlen, recordlen;
|
|
|
|
PMCDBG3(LOG,EXC,1,"po=%p pid=%d path=\"%s\"", po, pid, path);
|
|
|
|
pathlen = strlen(path) + 1; /* #bytes for the path */
|
|
recordlen = offsetof(struct pmclog_procexec, pl_pathname) + pathlen;
|
|
PMCLOG_RESERVE(po, PROCEXEC, recordlen);
|
|
PMCLOG_EMIT32(pid);
|
|
PMCLOG_EMIT32(pmid);
|
|
PMCLOG_EMITADDR(startaddr);
|
|
PMCLOG_EMITSTRING(path,pathlen);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
}
|
|
|
|
/*
|
|
* Log a process exit event (and accumulated pmc value) to the log file.
|
|
*/
|
|
|
|
void
|
|
pmclog_process_procexit(struct pmc *pm, struct pmc_process *pp)
|
|
{
|
|
int ri;
|
|
struct pmc_owner *po;
|
|
|
|
ri = PMC_TO_ROWINDEX(pm);
|
|
PMCDBG3(LOG,EXT,1,"pm=%p pid=%d v=%jx", pm, pp->pp_proc->p_pid,
|
|
pp->pp_pmcs[ri].pp_pmcval);
|
|
|
|
po = pm->pm_owner;
|
|
|
|
PMCLOG_RESERVE(po, PROCEXIT, sizeof(struct pmclog_procexit));
|
|
PMCLOG_EMIT32(pm->pm_id);
|
|
PMCLOG_EMIT32(pp->pp_proc->p_pid);
|
|
PMCLOG_EMIT64(pp->pp_pmcs[ri].pp_pmcval);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
|
|
/*
|
|
* Log a fork event.
|
|
*/
|
|
|
|
void
|
|
pmclog_process_procfork(struct pmc_owner *po, pid_t oldpid, pid_t newpid)
|
|
{
|
|
PMCLOG_RESERVE(po, PROCFORK, sizeof(struct pmclog_procfork));
|
|
PMCLOG_EMIT32(oldpid);
|
|
PMCLOG_EMIT32(newpid);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
|
|
/*
|
|
* Log a process exit event of the form suitable for system-wide PMCs.
|
|
*/
|
|
|
|
void
|
|
pmclog_process_sysexit(struct pmc_owner *po, pid_t pid)
|
|
{
|
|
PMCLOG_RESERVE(po, SYSEXIT, sizeof(struct pmclog_sysexit));
|
|
PMCLOG_EMIT32(pid);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
|
|
void
|
|
pmclog_process_threadcreate(struct pmc_owner *po, struct thread *td, int sync)
|
|
{
|
|
struct proc *p;
|
|
|
|
p = td->td_proc;
|
|
if (sync) {
|
|
PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate));
|
|
PMCLOG_EMIT32(td->td_tid);
|
|
PMCLOG_EMIT32(p->p_pid);
|
|
PMCLOG_EMIT32(p->p_flag);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
|
|
PMCLOG_DESPATCH_SYNC(po);
|
|
} else {
|
|
PMCLOG_RESERVE(po, THR_CREATE, sizeof(struct pmclog_threadcreate));
|
|
PMCLOG_EMIT32(td->td_tid);
|
|
PMCLOG_EMIT32(p->p_pid);
|
|
PMCLOG_EMIT32(p->p_flag);
|
|
PMCLOG_EMIT32(0);
|
|
PMCLOG_EMITSTRING(td->td_name, MAXCOMLEN+1);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
}
|
|
|
|
void
|
|
pmclog_process_threadexit(struct pmc_owner *po, struct thread *td)
|
|
{
|
|
|
|
PMCLOG_RESERVE(po, THR_EXIT, sizeof(struct pmclog_threadexit));
|
|
PMCLOG_EMIT32(td->td_tid);
|
|
PMCLOG_DESPATCH(po);
|
|
}
|
|
|
|
/*
|
|
* Write a user log entry.
|
|
*/
|
|
|
|
int
|
|
pmclog_process_userlog(struct pmc_owner *po, struct pmc_op_writelog *wl)
|
|
{
|
|
int error;
|
|
|
|
PMCDBG2(LOG,WRI,1, "writelog po=%p ud=0x%x", po, wl->pm_userdata);
|
|
|
|
error = 0;
|
|
|
|
PMCLOG_RESERVE_WITH_ERROR(po, USERDATA,
|
|
sizeof(struct pmclog_userdata));
|
|
PMCLOG_EMIT32(wl->pm_userdata);
|
|
PMCLOG_DESPATCH(po);
|
|
|
|
error:
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Initialization.
|
|
*
|
|
* Create a pool of log buffers and initialize mutexes.
|
|
*/
|
|
|
|
void
|
|
pmclog_initialize()
|
|
{
|
|
int domain;
|
|
struct pmclog_buffer *plb;
|
|
|
|
if (pmclog_buffer_size <= 0 || pmclog_buffer_size > 16*1024) {
|
|
(void) printf("hwpmc: tunable logbuffersize=%d must be "
|
|
"greater than zero and less than or equal to 16MB.\n",
|
|
pmclog_buffer_size);
|
|
pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
|
|
}
|
|
|
|
if (pmc_nlogbuffers_pcpu <= 0) {
|
|
(void) printf("hwpmc: tunable nlogbuffers=%d must be greater "
|
|
"than zero.\n", pmc_nlogbuffers_pcpu);
|
|
pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
|
|
}
|
|
if (pmc_nlogbuffers_pcpu*pmclog_buffer_size > 32*1024) {
|
|
(void) printf("hwpmc: memory allocated pcpu must be less than 32MB (is %dK).\n",
|
|
pmc_nlogbuffers_pcpu*pmclog_buffer_size);
|
|
pmc_nlogbuffers_pcpu = PMC_NLOGBUFFERS_PCPU;
|
|
pmclog_buffer_size = PMC_LOG_BUFFER_SIZE;
|
|
}
|
|
for (domain = 0; domain < vm_ndomains; domain++) {
|
|
int ncpus = pmc_dom_hdrs[domain]->pdbh_ncpus;
|
|
int total = ncpus*pmc_nlogbuffers_pcpu;
|
|
|
|
plb = malloc_domain(sizeof(struct pmclog_buffer)*total, M_PMC, domain, M_WAITOK|M_ZERO);
|
|
pmc_dom_hdrs[domain]->pdbh_plbs = plb;
|
|
for (int i = 0; i < total; i++, plb++) {
|
|
void *buf;
|
|
|
|
buf = malloc_domain(1024 * pmclog_buffer_size, M_PMC, domain,
|
|
M_WAITOK|M_ZERO);
|
|
PMCLOG_INIT_BUFFER_DESCRIPTOR(plb, buf, domain);
|
|
pmc_plb_rele_unlocked(plb);
|
|
}
|
|
}
|
|
mtx_init(&pmc_kthread_mtx, "pmc-kthread", "pmc-sleep", MTX_DEF);
|
|
}
|
|
|
|
/*
|
|
* Shutdown logging.
|
|
*
|
|
* Destroy mutexes and release memory back the to free pool.
|
|
*/
|
|
|
|
void
|
|
pmclog_shutdown()
|
|
{
|
|
struct pmclog_buffer *plb;
|
|
int domain;
|
|
|
|
mtx_destroy(&pmc_kthread_mtx);
|
|
|
|
for (domain = 0; domain < vm_ndomains; domain++) {
|
|
while ((plb = TAILQ_FIRST(&pmc_dom_hdrs[domain]->pdbh_head)) != NULL) {
|
|
TAILQ_REMOVE(&pmc_dom_hdrs[domain]->pdbh_head, plb, plb_next);
|
|
free(plb->plb_base, M_PMC);
|
|
}
|
|
free(pmc_dom_hdrs[domain]->pdbh_plbs, M_PMC);
|
|
}
|
|
}
|