1715f07da3
class to trace witness events. - Make the ktr_cpu field of ktr_entry be a standard field rather than one present only in the KTR_EXTEND case. - Move the default definition of KTR_ENTRIES from sys/ktr.h to kern/kern_ktr.c. It has not been needed in the header file since KTR was un-inlined. - Minor include cleanup in kern/kern_ktr.c. - Fiddle with the ktr_cpumask in ktr_tracepoint() to disable KTR events on the current CPU while we are processing an event. - Set the current CPU inside of the critical section to ensure we don't migrate CPU's after the critical section but before we set the CPU.
270 lines
6.6 KiB
C
270 lines
6.6 KiB
C
/*
|
|
* Copyright (c) 2000
|
|
* John Baldwin <jhb@FreeBSD.org>. 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.
|
|
* 4. Neither the name of the author nor the names of any co-contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY JOHN BALDWIN 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 JOHN BALDWIN OR THE VOICES IN HIS HEAD
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* This module holds the global variables used by KTR and the ktr_tracepoint()
|
|
* function that does the actual tracing.
|
|
*/
|
|
|
|
#include "opt_ddb.h"
|
|
#include "opt_ktr.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/cons.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/ktr.h>
|
|
#include <sys/libkern.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/time.h>
|
|
#include <machine/globals.h>
|
|
#include <machine/stdarg.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
|
|
#ifndef KTR_ENTRIES
|
|
#define KTR_ENTRIES 1024
|
|
#endif
|
|
|
|
#ifndef KTR_MASK
|
|
#define KTR_MASK (KTR_GEN)
|
|
#endif
|
|
|
|
#ifndef KTR_CPUMASK
|
|
#define KTR_CPUMASK (~0)
|
|
#endif
|
|
|
|
#ifdef SMP
|
|
#define KTR_CPU PCPU_GET(cpuid)
|
|
#else
|
|
#define KTR_CPU 0
|
|
#endif
|
|
|
|
#ifdef KTR_EXTEND
|
|
#define KTR_EXTEND_DEFAULT 1
|
|
#else
|
|
#define KTR_EXTEND_DEFAULT 0
|
|
#endif
|
|
|
|
#ifdef KTR_VERBOSE
|
|
#define KTR_VERBOSE_DEFAULT 1
|
|
#else
|
|
#define KTR_VERBOSE_DEFAULT 0
|
|
#endif
|
|
|
|
SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD, 0, "KTR options");
|
|
|
|
/*
|
|
* This variable is used only by gdb to work out what fields are in
|
|
* ktr_entry.
|
|
*/
|
|
int ktr_extend = KTR_EXTEND_DEFAULT;
|
|
SYSCTL_INT(_debug_ktr, OID_AUTO, extend, CTLFLAG_RD, &ktr_extend, 0, "");
|
|
|
|
int ktr_cpumask = KTR_CPUMASK;
|
|
TUNABLE_INT("debug.ktr.cpumask", &ktr_cpumask);
|
|
SYSCTL_INT(_debug_ktr, OID_AUTO, cpumask, CTLFLAG_RW, &ktr_cpumask, 0, "");
|
|
|
|
int ktr_mask = KTR_MASK;
|
|
TUNABLE_INT("debug.ktr.mask", &ktr_mask);
|
|
SYSCTL_INT(_debug_ktr, OID_AUTO, mask, CTLFLAG_RW, &ktr_mask, 0, "");
|
|
|
|
int ktr_entries = KTR_ENTRIES;
|
|
SYSCTL_INT(_debug_ktr, OID_AUTO, entries, CTLFLAG_RD, &ktr_entries, 0, "");
|
|
|
|
volatile int ktr_idx = 0;
|
|
struct ktr_entry ktr_buf[KTR_ENTRIES];
|
|
|
|
int ktr_verbose = KTR_VERBOSE_DEFAULT;
|
|
TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
|
|
SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
|
|
|
|
#ifdef KTR
|
|
#ifdef KTR_EXTEND
|
|
void
|
|
ktr_tracepoint(u_int mask, const char *filename, u_int line,
|
|
const char *format, ...)
|
|
#else
|
|
void
|
|
ktr_tracepoint(u_int mask, const char *format, u_long arg1, u_long arg2,
|
|
u_long arg3, u_long arg4, u_long arg5)
|
|
#endif
|
|
{
|
|
struct ktr_entry *entry;
|
|
int newindex, saveindex;
|
|
critical_t savecrit;
|
|
#ifdef KTR_EXTEND
|
|
va_list ap;
|
|
#endif
|
|
|
|
if (panicstr)
|
|
return;
|
|
if ((ktr_mask & mask) == 0)
|
|
return;
|
|
savecrit = critical_enter();
|
|
if (((1 << KTR_CPU) & ktr_cpumask) == 0) {
|
|
critical_exit(savecrit);
|
|
return;
|
|
}
|
|
atomic_clear_int(&ktr_cpumask, 1 << KTR_CPU);
|
|
do {
|
|
saveindex = ktr_idx;
|
|
newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
|
|
} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
|
|
entry = &ktr_buf[saveindex];
|
|
/*
|
|
* XXX: The ktr_cpumask atomic ops should make this unnecessary.
|
|
*/
|
|
if ((ktr_mask & (KTR_LOCK | KTR_WITNESS)) != 0)
|
|
getnanotime(&entry->ktr_tv);
|
|
else
|
|
nanotime(&entry->ktr_tv);
|
|
atomic_set_int(&ktr_cpumask, 1 << KTR_CPU);
|
|
entry->ktr_cpu = KTR_CPU;
|
|
critical_exit(savecrit);
|
|
#ifdef KTR_EXTEND
|
|
entry->ktr_filename = filename;
|
|
entry->ktr_line = line;
|
|
va_start(ap, format);
|
|
vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
|
|
va_end(ap);
|
|
if (ktr_verbose) {
|
|
#ifdef SMP
|
|
printf("cpu%d ", entry->ktr_cpu);
|
|
#endif
|
|
if (ktr_verbose > 1)
|
|
printf("%s.%d\t", entry->ktr_filename, entry->ktr_line);
|
|
va_start(ap, format);
|
|
vprintf(format, ap);
|
|
printf("\n");
|
|
va_end(ap);
|
|
}
|
|
#else
|
|
entry->ktr_desc = format;
|
|
entry->ktr_parm1 = arg1;
|
|
entry->ktr_parm2 = arg2;
|
|
entry->ktr_parm3 = arg3;
|
|
entry->ktr_parm4 = arg4;
|
|
entry->ktr_parm5 = arg5;
|
|
#endif
|
|
}
|
|
|
|
#ifdef DDB
|
|
|
|
struct tstate {
|
|
int cur;
|
|
int first;
|
|
};
|
|
static struct tstate tstate;
|
|
static int db_ktr_verbose;
|
|
static int db_mach_vtrace(void);
|
|
|
|
#define NUM_LINES_PER_PAGE 18
|
|
|
|
DB_SHOW_COMMAND(ktr, db_ktr_all)
|
|
{
|
|
int c, lines;
|
|
|
|
lines = NUM_LINES_PER_PAGE;
|
|
tstate.cur = (ktr_idx - 1) & (KTR_ENTRIES - 1);
|
|
tstate.first = -1;
|
|
if (strcmp(modif, "v") == 0)
|
|
db_ktr_verbose = 1;
|
|
else
|
|
db_ktr_verbose = 0;
|
|
while (db_mach_vtrace())
|
|
if (--lines == 0) {
|
|
db_printf("--More--");
|
|
c = cngetc();
|
|
db_printf("\r");
|
|
switch (c) {
|
|
case '\n': /* one more line */
|
|
lines = 1;
|
|
break;
|
|
case ' ': /* one more page */
|
|
lines = NUM_LINES_PER_PAGE;
|
|
break;
|
|
default:
|
|
db_printf("\n");
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
db_mach_vtrace(void)
|
|
{
|
|
struct ktr_entry *kp;
|
|
|
|
if (tstate.cur == tstate.first) {
|
|
db_printf("--- End of trace buffer ---\n");
|
|
return (0);
|
|
}
|
|
kp = &ktr_buf[tstate.cur];
|
|
|
|
/* Skip over unused entries. */
|
|
#ifdef KTR_EXTEND
|
|
if (kp->ktr_desc[0] == '\0') {
|
|
#else
|
|
if (kp->ktr_desc == NULL) {
|
|
#endif
|
|
db_printf("--- End of trace buffer ---\n");
|
|
return (0);
|
|
}
|
|
db_printf("%d: ", tstate.cur);
|
|
if (db_ktr_verbose)
|
|
db_printf("%4ld.%06ld ", (long)kp->ktr_tv.tv_sec,
|
|
kp->ktr_tv.tv_nsec / 1000);
|
|
#ifdef KTR_EXTEND
|
|
#ifdef SMP
|
|
db_printf("cpu%d ", kp->ktr_cpu);
|
|
#endif
|
|
if (db_ktr_verbose)
|
|
db_printf("%s.%d\t", kp->ktr_filename, kp->ktr_line);
|
|
db_printf("%s", kp->ktr_desc);
|
|
#else
|
|
db_printf(kp->ktr_desc, kp->ktr_parm1, kp->ktr_parm2, kp->ktr_parm3,
|
|
kp->ktr_parm4, kp->ktr_parm5);
|
|
#endif
|
|
db_printf("\n");
|
|
|
|
if (tstate.first == -1)
|
|
tstate.first = tstate.cur;
|
|
|
|
if (--tstate.cur < 0)
|
|
tstate.cur = KTR_ENTRIES - 1;
|
|
|
|
return (1);
|
|
}
|
|
|
|
#endif /* DDB */
|
|
#endif /* KTR */
|