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d664747bfa
can lead to further panics. - Call getnanotime() instead of nanotime() for the timestamp. nanotime() is more precise, but it also calls into the timer code, which results in mutex operations on the i386 arch. If KTR_LOCK is turned on, then ktr_tracepoint() recurses on itself until it exhausts the kernel stack. Eventually this should change to use get_cyclecount() instead, but that can't happen if get_cyclecount() is calling nanotime() instead of getnanotime().
156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
/*
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* Copyright (c) 2000
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* John Baldwin <jhb@FreeBSD.org>. All rights reserved.
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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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* 4. Neither the name of the author nor the names of any co-contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JOHN BALDWIN 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 JOHN BALDWIN OR THE VOICES IN HIS HEAD
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* This module holds the global variables used by KTR and the ktr_tracepoint()
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* function that does the actual tracing.
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*/
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#include "opt_ktr.h"
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/ktr.h>
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#include <sys/libkern.h>
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#include <sys/linker_set.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <machine/globals.h>
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#include <machine/stdarg.h>
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#ifndef KTR_MASK
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#define KTR_MASK (KTR_GEN)
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#endif
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#ifndef KTR_CPUMASK
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#define KTR_CPUMASK (~0)
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#endif
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#ifdef SMP
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#define KTR_CPU cpuid
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#else
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#define KTR_CPU 0
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#endif
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#ifdef KTR_EXTEND
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/*
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* This variable is used only by gdb to work out what fields are in
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* ktr_entry.
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*/
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int ktr_extend = 1;
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SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 1, "");
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#else
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int ktr_extend = 0;
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SYSCTL_INT(_debug, OID_AUTO, ktr_extend, CTLFLAG_RD, &ktr_extend, 0, "");
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#endif /* KTR_EXTEND */
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int ktr_cpumask = KTR_CPUMASK;
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SYSCTL_INT(_debug, OID_AUTO, ktr_cpumask, CTLFLAG_RW, &ktr_cpumask, KTR_CPUMASK, "");
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int ktr_mask = KTR_MASK;
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SYSCTL_INT(_debug, OID_AUTO, ktr_mask, CTLFLAG_RW, &ktr_mask, KTR_MASK, "");
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int ktr_entries = KTR_ENTRIES;
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SYSCTL_INT(_debug, OID_AUTO, ktr_entries, CTLFLAG_RD, &ktr_entries, KTR_ENTRIES, "");
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volatile int ktr_idx = 0;
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struct ktr_entry ktr_buf[KTR_ENTRIES];
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#ifdef KTR_VERBOSE
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int ktr_verbose = 1;
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#else
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int ktr_verbose = 0;
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#endif
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SYSCTL_INT(_debug, OID_AUTO, ktr_verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
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#ifdef KTR
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#ifdef KTR_EXTEND
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void
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ktr_tracepoint(u_int mask, char *filename, u_int line, char *format, ...)
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#else
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void
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ktr_tracepoint(u_int mask, char *format, u_long arg1, u_long arg2, u_long arg3,
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u_long arg4, u_long arg5)
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#endif
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{
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struct ktr_entry *entry;
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int newindex, saveindex, saveintr;
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#ifdef KTR_EXTEND
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va_list ap;
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#endif
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if (panicstr)
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return;
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if ((ktr_mask & mask) == 0)
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return;
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#ifdef KTR_EXTEND
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if (((1 << KTR_CPU) & ktr_cpumask) == 0)
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return;
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#endif
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saveintr = save_intr();
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disable_intr();
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do {
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saveindex = ktr_idx;
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newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
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} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
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entry = &ktr_buf[saveindex];
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restore_intr(saveintr);
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getnanotime(&entry->ktr_tv);
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#ifdef KTR_EXTEND
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strncpy(entry->ktr_filename, filename, KTRFILENAMESIZE - 1);
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entry->ktr_filename[KTRFILENAMESIZE - 1] = '\0';
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entry->ktr_line = line;
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entry->ktr_cpu = KTR_CPU;
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va_start(ap, format);
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vsnprintf(entry->ktr_desc, KTRDESCSIZE, format, ap);
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va_end(ap);
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if (ktr_verbose) {
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#ifdef SMP
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printf("cpu%d ", entry->ktr_cpu);
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#endif
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if (ktr_verbose > 1)
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printf("%s.%d\t", entry->ktr_filename, entry->ktr_line);
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va_start(ap, format);
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vprintf(format, ap);
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printf("\n");
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va_end(ap);
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}
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#else
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entry->ktr_desc = format;
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entry->ktr_parm1 = arg1;
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entry->ktr_parm2 = arg2;
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entry->ktr_parm3 = arg3;
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entry->ktr_parm4 = arg4;
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entry->ktr_parm5 = arg5;
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#endif
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}
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#endif /* KTR */
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