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📄 Make.tags.inc(2.13 KB)
📄 Makefile(302 B)
📄 bus_if.m(26.31 KB)
📄 capabilities.conf(13.67 KB)
📄 clock_if.m(1.7 KB)
📄 cpufreq_if.m(2.27 KB)
📄 device_if.m(10.41 KB)
📄 firmw.S(2.15 KB)
📄 genassym.sh(1.11 KB)
📄 genoffset.c(1.68 KB)
📄 genoffset.sh(3.58 KB)
📄 imgact_aout.c(9.45 KB)
📄 imgact_binmisc.c(18.64 KB)
📄 imgact_elf.c(76.32 KB)
📄 imgact_elf32.c(1.47 KB)
📄 imgact_elf64.c(1.47 KB)
📄 imgact_shell.c(8.41 KB)
📄 init_main.c(24.31 KB)
📄 init_sysent.c(95.3 KB)
📄 kern_acct.c(19.03 KB)
📄 kern_alq.c(24.97 KB)
📄 kern_clock.c(21.12 KB)
📄 kern_clocksource.c(23.34 KB)
📄 kern_condvar.c(11.28 KB)
📄 kern_conf.c(36.14 KB)
📄 kern_cons.c(15.75 KB)
📄 kern_context.c(3.59 KB)
📄 kern_cpu.c(30.77 KB)
📄 kern_cpuset.c(59.78 KB)
📄 kern_ctf.c(8.73 KB)
📄 kern_descrip.c(112.87 KB)
📄 kern_dtrace.c(2.94 KB)
📄 kern_dump.c(8.51 KB)
📄 kern_environment.c(22.75 KB)
📄 kern_et.c(7.1 KB)
📄 kern_event.c(62.49 KB)
📄 kern_exec.c(46.67 KB)
📄 kern_exit.c(34.61 KB)
📄 kern_fail.c(29.32 KB)
📄 kern_ffclock.c(12.66 KB)
📄 kern_fork.c(28.29 KB)
📄 kern_hhook.c(13.58 KB)
📄 kern_idle.c(2.74 KB)
📄 kern_intr.c(40.44 KB)
📄 kern_jail.c(112.67 KB)
📄 kern_kcov.c(15.32 KB)
📄 kern_khelp.c(9.45 KB)
📄 kern_kthread.c(11.8 KB)
📄 kern_ktr.c(11.93 KB)
📄 kern_ktrace.c(31.41 KB)
📄 kern_linker.c(54.3 KB)
📄 kern_lock.c(46.99 KB)
📄 kern_lockf.c(64.46 KB)
📄 kern_lockstat.c(3.8 KB)
📄 kern_loginclass.c(6.69 KB)
📄 kern_malloc.c(37.09 KB)
📄 kern_mbuf.c(43.16 KB)
📄 kern_mib.c(24.26 KB)
📄 kern_module.c(11.05 KB)
📄 kern_mtxpool.c(5.82 KB)
📄 kern_mutex.c(33.62 KB)
📄 kern_ntptime.c(32.49 KB)
📄 kern_osd.c(12.37 KB)
📄 kern_physio.c(5.74 KB)
📄 kern_pmc.c(8.89 KB)
📄 kern_poll.c(15.86 KB)
📄 kern_priv.c(9.14 KB)
📄 kern_proc.c(80.01 KB)
📄 kern_procctl.c(19.48 KB)
📄 kern_prot.c(57.94 KB)
📄 kern_racct.c(34.01 KB)
📄 kern_rangelock.c(8.67 KB)
📄 kern_rctl.c(53.87 KB)
📄 kern_resource.c(36.66 KB)
📄 kern_rmlock.c(28.27 KB)
📄 kern_rwlock.c(40.72 KB)
📄 kern_sdt.c(2.05 KB)
📄 kern_sema.c(4.85 KB)
📄 kern_sendfile.c(33.97 KB)
📄 kern_sharedpage.c(10.37 KB)
📄 kern_shutdown.c(43.34 KB)
📄 kern_sig.c(101.89 KB)
📄 kern_switch.c(13.85 KB)
📄 kern_sx.c(40.27 KB)
📄 kern_synch.c(18.17 KB)
📄 kern_syscalls.c(6.74 KB)
📄 kern_sysctl.c(67.24 KB)
📄 kern_tc.c(55.73 KB)
📄 kern_thr.c(14.14 KB)
📄 kern_thread.c(41.75 KB)
📄 kern_time.c(40.89 KB)
📄 kern_timeout.c(43.08 KB)
📄 kern_tslog.c(3.44 KB)
📄 kern_ubsan.c(50.74 KB)
📄 kern_umtx.c(107.14 KB)
📄 kern_uuid.c(11.68 KB)
📄 kern_xxx.c(10.44 KB)
📄 ksched.c(6.56 KB)
📄 link_elf.c(47.99 KB)
📄 link_elf_obj.c(44.41 KB)
📄 linker_if.m(3.96 KB)
📄 makesyscalls.sh(23.57 KB)
📄 md4c.c(7.89 KB)
📄 md5c.c(9.56 KB)
📄 msi_if.m(2.48 KB)
📄 p1003_1b.c(8.84 KB)
📄 pic_if.m(3.9 KB)
📄 posix4_mib.c(5.59 KB)
📄 sched_4bsd.c(45.03 KB)
📄 sched_ule.c(82.65 KB)
📄 serdev_if.m(3.49 KB)
📄 stack_protector.c(613 B)
📄 subr_acl_nfs4.c(37.42 KB)
📄 subr_acl_posix1e.c(17.71 KB)
📄 subr_atomic64.c(3.97 KB)
📄 subr_autoconf.c(7.7 KB)
📄 subr_blist.c(31.88 KB)
📄 subr_boot.c(5.8 KB)
📄 subr_bufring.c(2.21 KB)
📄 subr_bus.c(145.4 KB)
📄 subr_bus_dma.c(19.67 KB)
📄 subr_busdma_bufalloc.c(5.24 KB)
📄 subr_capability.c(11.93 KB)
📄 subr_clock.c(10.61 KB)
📄 subr_compressor.c(13.11 KB)
📄 subr_counter.c(4.44 KB)
📄 subr_coverage.c(6.17 KB)
📄 subr_csan.c(25.39 KB)
📄 subr_devmap.c(9.8 KB)
📄 subr_devstat.c(16.21 KB)
📄 subr_disk.c(8.54 KB)
📄 subr_dummy_vdso_tc.c(1.7 KB)
📄 subr_early.c(2.26 KB)
📄 subr_epoch.c(25.02 KB)
📄 subr_eventhandler.c(9.17 KB)
📄 subr_fattime.c(9.98 KB)
📄 subr_filter.c(12.2 KB)
📄 subr_firmware.c(13.88 KB)
📄 subr_gtaskqueue.c(20.19 KB)
📄 subr_hash.c(4.8 KB)
📄 subr_hints.c(12.87 KB)
📄 subr_intr.c(40.61 KB)
📄 subr_kdb.c(16.13 KB)
📄 subr_kobj.c(7.1 KB)
📄 subr_lock.c(18.81 KB)
📄 subr_log.c(7.64 KB)
📄 subr_mchain.c(11.06 KB)
📄 subr_module.c(12.98 KB)
📄 subr_msgbuf.c(10.6 KB)
📄 subr_param.c(10.93 KB)
📄 subr_pcpu.c(10.18 KB)
📄 subr_pctrie.c(20.99 KB)
📄 subr_physmem.c(11.52 KB)
📄 subr_pidctrl.c(5.43 KB)
📄 subr_power.c(3.13 KB)
📄 subr_prf.c(27.42 KB)
📄 subr_prng.c(3.36 KB)
📄 subr_prof.c(15.43 KB)
📄 subr_rangeset.c(8.5 KB)
📄 subr_rman.c(27.61 KB)
📄 subr_rtc.c(11.42 KB)
📄 subr_sbuf.c(20.53 KB)
📄 subr_scanf.c(15.59 KB)
📄 subr_sfbuf.c(6.17 KB)
📄 subr_sglist.c(22.83 KB)
📄 subr_sleepqueue.c(39.43 KB)
📄 subr_smp.c(31.62 KB)
📄 subr_smr.c(20.17 KB)
📄 subr_stack.c(6.47 KB)
📄 subr_stats.c(103.01 KB)
📄 subr_syscall.c(7.98 KB)
📄 subr_taskqueue.c(21.1 KB)
📄 subr_terminal.c(15.52 KB)
📄 subr_trap.c(10.87 KB)
📄 subr_turnstile.c(35.58 KB)
📄 subr_uio.c(11.38 KB)
📄 subr_unit.c(22.97 KB)
📄 subr_vmem.c(43.25 KB)
📄 subr_witness.c(84.59 KB)
📄 sys_capability.c(15.06 KB)
📄 sys_eventfd.c(8.42 KB)
📄 sys_generic.c(44.22 KB)
📄 sys_getrandom.c(4.21 KB)
📄 sys_pipe.c(45.14 KB)
📄 sys_procdesc.c(14.57 KB)
📄 sys_process.c(30.73 KB)
📄 sys_socket.c(20.11 KB)
📄 syscalls.c(22.73 KB)
📄 syscalls.master(60.26 KB)
📄 systrace_args.c(178.49 KB)
📄 sysv_ipc.c(6.53 KB)
📄 sysv_msg.c(48.65 KB)
📄 sysv_sem.c(49.85 KB)
📄 sysv_shm.c(43.93 KB)
📄 tty.c(55.14 KB)
📄 tty_compat.c(11.46 KB)
📄 tty_info.c(9.93 KB)
📄 tty_inq.c(12.22 KB)
📄 tty_outq.c(8.74 KB)
📄 tty_pts.c(19.74 KB)
📄 tty_tty.c(2.83 KB)
📄 tty_ttydisc.c(28.6 KB)
📄 uipc_accf.c(8.07 KB)
📄 uipc_debug.c(12.42 KB)
📄 uipc_domain.c(13.13 KB)
📄 uipc_ktls.c(55.7 KB)
📄 uipc_mbuf.c(52.45 KB)
📄 uipc_mbuf2.c(12.64 KB)
📄 uipc_mbufhash.c(4.9 KB)
📄 uipc_mqueue.c(64.64 KB)
📄 uipc_sem.c(25.18 KB)
📄 uipc_shm.c(50.47 KB)
📄 uipc_sockbuf.c(42.9 KB)
📄 uipc_socket.c(110.61 KB)
📄 uipc_syscalls.c(35.94 KB)
📄 uipc_usrreq.c(75.11 KB)
📄 vfs_acl.c(14.5 KB)
📄 vfs_aio.c(76.32 KB)
📄 vfs_bio.c(145.39 KB)
📄 vfs_cache.c(143.09 KB)
📄 vfs_cluster.c(28.36 KB)
📄 vfs_default.c(33.16 KB)
📄 vfs_export.c(14.55 KB)
📄 vfs_extattr.c(17.91 KB)
📄 vfs_hash.c(6 KB)
📄 vfs_init.c(15.86 KB)
📄 vfs_lookup.c(45.48 KB)
📄 vfs_mount.c(62.58 KB)
📄 vfs_mountroot.c(26.23 KB)
📄 vfs_subr.c(167.52 KB)
📄 vfs_syscalls.c(106.86 KB)
📄 vfs_vnops.c(86.28 KB)
📄 vnode_if.src(13.66 KB)

Editing: kern_ktr.c

/*-
 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
 *
 * Copyright (c) 2000 John Baldwin <jhb@FreeBSD.org>
 *
 * 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.
 */

/*
 * This module holds the global variables used by KTR and the ktr_tracepoint()
 * function that does the actual tracing.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_ddb.h"
#include "opt_ktr.h"
#include "opt_alq.h"

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/alq.h>
#include <sys/cons.h>
#include <sys/cpuset.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/libkern.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/time.h>

#include <machine/cpu.h>

#ifdef DDB
#include <ddb/ddb.h>
#include <ddb/db_output.h>
#endif

#ifndef KTR_BOOT_ENTRIES
#define	KTR_BOOT_ENTRIES	1024
#endif

#ifndef KTR_ENTRIES
#define	KTR_ENTRIES	1024
#endif

/* Limit the allocations to something manageable. */
#define	KTR_ENTRIES_MAX	(8 * 1024 * 1024)

#ifndef KTR_MASK
#define	KTR_MASK	(0)
#endif

#ifndef KTR_CPUMASK
#define	KTR_CPUMASK	CPUSET_FSET
#endif

#ifndef KTR_TIME
#define	KTR_TIME	get_cyclecount()
#endif

#ifndef KTR_CPU
#define	KTR_CPU		PCPU_GET(cpuid)
#endif

static MALLOC_DEFINE(M_KTR, "KTR", "KTR");

FEATURE(ktr, "Kernel support for KTR kernel tracing facility");

volatile int	ktr_idx = 0;
uint64_t ktr_mask = KTR_MASK;
uint64_t ktr_compile = KTR_COMPILE;
int	ktr_entries = KTR_BOOT_ENTRIES;
int	ktr_version = KTR_VERSION;
struct	ktr_entry ktr_buf_init[KTR_BOOT_ENTRIES];
struct	ktr_entry *ktr_buf = ktr_buf_init;
cpuset_t ktr_cpumask = CPUSET_T_INITIALIZER(KTR_CPUMASK);

static SYSCTL_NODE(_debug, OID_AUTO, ktr, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "KTR options");

SYSCTL_INT(_debug_ktr, OID_AUTO, version, CTLFLAG_RD,
    &ktr_version, 0, "Version of the KTR interface");

SYSCTL_UQUAD(_debug_ktr, OID_AUTO, compile, CTLFLAG_RD,
    &ktr_compile, 0, "Bitmask of KTR event classes compiled into the kernel");

static int
sysctl_debug_ktr_cpumask(SYSCTL_HANDLER_ARGS)
{
	char lktr_cpumask_str[CPUSETBUFSIZ];
	cpuset_t imask;
	int error;

cpusetobj_strprint(lktr_cpumask_str, &ktr_cpumask);
	error = sysctl_handle_string(oidp, lktr_cpumask_str,
	    sizeof(lktr_cpumask_str), req);
	if (error != 0 || req->newptr == NULL)
		return (error);
	if (cpusetobj_strscan(&imask, lktr_cpumask_str) == -1)
		return (EINVAL);
	CPU_COPY(&imask, &ktr_cpumask);

return (error);
}
SYSCTL_PROC(_debug_ktr, OID_AUTO, cpumask,
    CTLFLAG_RWTUN | CTLFLAG_MPSAFE | CTLTYPE_STRING, NULL, 0,
    sysctl_debug_ktr_cpumask, "S",
    "Bitmask of CPUs on which KTR logging is enabled");

static int
sysctl_debug_ktr_clear(SYSCTL_HANDLER_ARGS)
{
	int clear, error;

clear = 0;
	error = sysctl_handle_int(oidp, &clear, 0, req);
	if (error || !req->newptr)
		return (error);

if (clear) {
		bzero(ktr_buf, sizeof(*ktr_buf) * ktr_entries);
		ktr_idx = 0;
	}

return (error);
}
SYSCTL_PROC(_debug_ktr, OID_AUTO, clear,
    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0,
    sysctl_debug_ktr_clear, "I",
    "Clear KTR Buffer");

/*
 * This is a sysctl proc so that it is serialized as !MPSAFE along with
 * the other ktr sysctl procs.
 */
static int
sysctl_debug_ktr_mask(SYSCTL_HANDLER_ARGS)
{
	uint64_t mask;
	int error;

mask = ktr_mask;
	error = sysctl_handle_64(oidp, &mask, 0, req);
	if (error || !req->newptr)
		return (error);
	ktr_mask = mask;
	return (error);
}

SYSCTL_PROC(_debug_ktr, OID_AUTO, mask,
    CTLTYPE_U64 | CTLFLAG_RWTUN | CTLFLAG_NEEDGIANT,
    0, 0, sysctl_debug_ktr_mask, "QU",
    "Bitmask of KTR event classes for which logging is enabled");

#if KTR_ENTRIES > KTR_BOOT_ENTRIES
/*
 * A simplified version of sysctl_debug_ktr_entries.
 * No need to care about SMP, scheduling, etc.
 */
static void
ktr_entries_initializer(void *dummy __unused)
{
	uint64_t mask;

/* Temporarily disable ktr in case malloc() is being traced. */
	mask = ktr_mask;
	ktr_mask = 0;
	ktr_buf = malloc(sizeof(*ktr_buf) * KTR_ENTRIES, M_KTR,
	    M_WAITOK | M_ZERO);
	memcpy(ktr_buf, ktr_buf_init + ktr_idx,
	    (KTR_BOOT_ENTRIES - ktr_idx) * sizeof(*ktr_buf));
	if (ktr_idx != 0) {
		memcpy(ktr_buf + KTR_BOOT_ENTRIES - ktr_idx, ktr_buf_init,
		    ktr_idx * sizeof(*ktr_buf));
		ktr_idx = KTR_BOOT_ENTRIES;
	}
	ktr_entries = KTR_ENTRIES;
	ktr_mask = mask;
}
SYSINIT(ktr_entries_initializer, SI_SUB_KMEM, SI_ORDER_ANY,
    ktr_entries_initializer, NULL);
#endif

static int
sysctl_debug_ktr_entries(SYSCTL_HANDLER_ARGS)
{
	uint64_t mask;
	int entries, error;
	struct ktr_entry *buf, *oldbuf;

entries = ktr_entries;
	error = sysctl_handle_int(oidp, &entries, 0, req);
	if (error || !req->newptr)
		return (error);
	if (entries > KTR_ENTRIES_MAX)
		return (ERANGE);
	/* Disable ktr temporarily. */
	mask = ktr_mask;
	ktr_mask = 0;
	/* Wait for threads to go idle. */
	if ((error = quiesce_all_cpus("ktrent", PCATCH)) != 0) {
		ktr_mask = mask;
		return (error);
	}
	if (ktr_buf != ktr_buf_init)
		oldbuf = ktr_buf;
	else
		oldbuf = NULL;
	/* Allocate a new buffer. */
	buf = malloc(sizeof(*buf) * entries, M_KTR, M_WAITOK | M_ZERO);
	/* Install the new buffer and restart ktr. */
	ktr_buf = buf;
	ktr_entries = entries;
	ktr_idx = 0;
	ktr_mask = mask;
	if (oldbuf != NULL)
		free(oldbuf, M_KTR);

return (error);
}

SYSCTL_PROC(_debug_ktr, OID_AUTO, entries,
    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
    0, 0, sysctl_debug_ktr_entries, "I",
    "Number of entries in the KTR buffer");

#ifdef KTR_VERBOSE
int	ktr_verbose = KTR_VERBOSE;
TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
#endif

#ifdef KTR_ALQ
struct alq *ktr_alq;
char	ktr_alq_file[MAXPATHLEN] = "/tmp/ktr.out";
int	ktr_alq_cnt = 0;
int	ktr_alq_depth = KTR_ENTRIES;
int	ktr_alq_enabled = 0;
int	ktr_alq_failed = 0;
int	ktr_alq_max = 0;

SYSCTL_INT(_debug_ktr, OID_AUTO, alq_max, CTLFLAG_RW, &ktr_alq_max, 0,
    "Maximum number of entries to write");
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_cnt, CTLFLAG_RD, &ktr_alq_cnt, 0,
    "Current number of written entries");
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_failed, CTLFLAG_RD, &ktr_alq_failed, 0,
    "Number of times we overran the buffer");
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_depth, CTLFLAG_RW, &ktr_alq_depth, 0,
    "Number of items in the write buffer");
SYSCTL_STRING(_debug_ktr, OID_AUTO, alq_file, CTLFLAG_RW, ktr_alq_file,
    sizeof(ktr_alq_file), "KTR logging file");

static int
sysctl_debug_ktr_alq_enable(SYSCTL_HANDLER_ARGS)
{
	int error;
	int enable;

enable = ktr_alq_enabled;

error = sysctl_handle_int(oidp, &enable, 0, req);
	if (error || !req->newptr)
		return (error);

if (enable) {
		if (ktr_alq_enabled)
			return (0);
		error = alq_open(&ktr_alq, (const char *)ktr_alq_file,
		    req->td->td_ucred, ALQ_DEFAULT_CMODE,
		    sizeof(struct ktr_entry), ktr_alq_depth);
		if (error == 0) {
			ktr_alq_cnt = 0;
			ktr_alq_failed = 0;
			ktr_alq_enabled = 1;
		}
	} else {
		if (ktr_alq_enabled == 0)
			return (0);
		ktr_alq_enabled = 0;
		alq_close(ktr_alq);
		ktr_alq = NULL;
	}

return (error);
}
SYSCTL_PROC(_debug_ktr, OID_AUTO, alq_enable,
    CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 0, 0,
    sysctl_debug_ktr_alq_enable, "I",
    "Enable KTR logging");
#endif

void
ktr_tracepoint(uint64_t mask, const char *file, int line, const char *format,
    u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
    u_long arg6)
{
	struct ktr_entry *entry;
#ifdef KTR_ALQ
	struct ale *ale = NULL;
#endif
	int newindex, saveindex;
#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
	struct thread *td;
#endif
	int cpu;

if (KERNEL_PANICKED() || kdb_active)
		return;
	if ((ktr_mask & mask) == 0 || ktr_buf == NULL)
		return;
	cpu = KTR_CPU;
	if (!CPU_ISSET(cpu, &ktr_cpumask))
		return;
#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
	td = curthread;
	if (td->td_pflags & TDP_INKTR)
		return;
	td->td_pflags |= TDP_INKTR;
#endif
#ifdef KTR_ALQ
	if (ktr_alq_enabled) {
		if (td->td_critnest == 0 &&
		    (TD_IS_IDLETHREAD(td)) == 0 &&
		    td != ald_thread) {
			if (ktr_alq_max && ktr_alq_cnt > ktr_alq_max)
				goto done;
			if ((ale = alq_get(ktr_alq, ALQ_NOWAIT)) == NULL) {
				ktr_alq_failed++;
				goto done;
			}
			ktr_alq_cnt++;
			entry = (struct ktr_entry *)ale->ae_data;
		} else {
			goto done;
		}
	} else
#endif
	{
		do {
			saveindex = ktr_idx;
			newindex = (saveindex + 1) % ktr_entries;
		} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
		entry = &ktr_buf[saveindex];
	}
	entry->ktr_timestamp = KTR_TIME;
	entry->ktr_cpu = cpu;
	entry->ktr_thread = curthread;
	if (file != NULL)
		while (strncmp(file, "../", 3) == 0)
			file += 3;
	entry->ktr_file = file;
	entry->ktr_line = line;
#ifdef KTR_VERBOSE
	if (ktr_verbose) {
#ifdef SMP
		printf("cpu%d ", cpu);
#endif
		if (ktr_verbose > 1) {
			printf("%s.%d\t", entry->ktr_file,
			    entry->ktr_line);
		}
		printf(format, arg1, arg2, arg3, arg4, arg5, arg6);
		printf("\n");
	}
#endif
	entry->ktr_desc = format;
	entry->ktr_parms[0] = arg1;
	entry->ktr_parms[1] = arg2;
	entry->ktr_parms[2] = arg3;
	entry->ktr_parms[3] = arg4;
	entry->ktr_parms[4] = arg5;
	entry->ktr_parms[5] = arg6;
#ifdef KTR_ALQ
	if (ktr_alq_enabled && ale)
		alq_post(ktr_alq, ale);
done:
#endif
#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
	td->td_pflags &= ~TDP_INKTR;
#endif
}

#ifdef DDB

struct tstate {
	int	cur;
	int	first;
};
static	struct tstate tstate;
static	int db_ktr_verbose;
static	int db_mach_vtrace(void);

DB_SHOW_COMMAND(ktr, db_ktr_all)
{

tstate.cur = (ktr_idx - 1) % ktr_entries;
	tstate.first = -1;
	db_ktr_verbose = 0;
	db_ktr_verbose |= (strchr(modif, 'v') != NULL) ? 2 : 0;
	db_ktr_verbose |= (strchr(modif, 'V') != NULL) ? 1 : 0; /* just timestamp please */
	if (strchr(modif, 'a') != NULL) {
		db_disable_pager();
		while (cncheckc() == -1)
			if (db_mach_vtrace() == 0)
				break;
	} else {
		while (!db_pager_quit)
			if (db_mach_vtrace() == 0)
				break;
	}
}

static int
db_mach_vtrace(void)
{
	struct ktr_entry	*kp;

if (tstate.cur == tstate.first || ktr_buf == NULL) {
		db_printf("--- End of trace buffer ---\n");
		return (0);
	}
	kp = &ktr_buf[tstate.cur];

/* Skip over unused entries. */
	if (kp->ktr_desc == NULL) {
		db_printf("--- End of trace buffer ---\n");
		return (0);
	}
	db_printf("%d (%p", tstate.cur, kp->ktr_thread);
#ifdef SMP
	db_printf(":cpu%d", kp->ktr_cpu);
#endif
	db_printf(")");
	if (db_ktr_verbose >= 1) {
		db_printf(" %10.10lld", (long long)kp->ktr_timestamp);
	}
	if (db_ktr_verbose >= 2) {
		db_printf(" %s.%d", kp->ktr_file, kp->ktr_line);
	}
	db_printf(": ");
	db_printf(kp->ktr_desc, kp->ktr_parms[0], kp->ktr_parms[1],
	    kp->ktr_parms[2], kp->ktr_parms[3], kp->ktr_parms[4],
	    kp->ktr_parms[5]);
	db_printf("\n");

if (tstate.first == -1)
		tstate.first = tstate.cur;

if (--tstate.cur < 0)
		tstate.cur = ktr_entries - 1;

return (1);
}

#endif	/* DDB */

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