119 lines
3.4 KiB
C
119 lines
3.4 KiB
C
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/*-
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* Copyright (c) 2017 Colin Percival
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* 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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*
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/sbuf.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <sys/tslog.h>
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#include <machine/atomic.h>
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#include <machine/cpu.h>
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#ifndef TSLOGSIZE
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#define TSLOGSIZE 262144
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#endif
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static volatile long nrecs = 0;
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static struct timestamp {
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void * td;
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int type;
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const char * f;
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const char * s;
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uint64_t tsc;
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} timestamps[TSLOGSIZE];
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void
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tslog(void * td, int type, const char * f, const char * s)
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{
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uint64_t tsc = get_cyclecount();
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long pos;
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/* Grab a slot. */
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pos = atomic_fetchadd_long(&nrecs, 1);
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/* Store record. */
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if (pos < nitems(timestamps)) {
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timestamps[pos].td = td;
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timestamps[pos].type = type;
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timestamps[pos].f = f;
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timestamps[pos].s = s;
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timestamps[pos].tsc = tsc;
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}
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}
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static int
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sysctl_debug_tslog(SYSCTL_HANDLER_ARGS)
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{
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int error;
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struct sbuf *sb;
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size_t i, limit;
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/*
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* This code can race against the code in tslog() which stores
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* records: Theoretically we could end up reading a record after
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* its slots have been reserved but before it has been written.
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* Since this code takes orders of magnitude longer to run than
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* tslog() takes to write a record, it is highly unlikely that
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* anyone will ever experience this race.
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*/
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sb = sbuf_new_for_sysctl(NULL, NULL, 1024, req);
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limit = MIN(nrecs, nitems(timestamps));
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for (i = 0; i < limit; i++) {
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sbuf_printf(sb, "%p", timestamps[i].td);
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sbuf_printf(sb, " %llu",
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(unsigned long long)timestamps[i].tsc);
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switch (timestamps[i].type) {
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case TS_ENTER:
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sbuf_printf(sb, " ENTER");
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break;
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case TS_EXIT:
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sbuf_printf(sb, " EXIT");
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break;
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case TS_THREAD:
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sbuf_printf(sb, " THREAD");
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break;
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case TS_EVENT:
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sbuf_printf(sb, " EVENT");
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break;
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}
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sbuf_printf(sb, " %s", timestamps[i].f ? timestamps[i].f : "(null)");
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if (timestamps[i].s)
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sbuf_printf(sb, " %s\n", timestamps[i].s);
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else
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sbuf_printf(sb, "\n");
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}
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error = sbuf_finish(sb);
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sbuf_delete(sb);
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return (error);
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}
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SYSCTL_PROC(_debug, OID_AUTO, tslog, CTLTYPE_STRING|CTLFLAG_RD|CTLFLAG_MPSAFE,
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0, 0, sysctl_debug_tslog, "", "Dump recorded event timestamps");
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