mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-04 09:09:56 +00:00
a5aedd68b4
adds probes for mutexes, reader/writer and shared/exclusive locks to gather contention statistics and other locking information for dtrace scripts, the lockstat(1M) command and other potential consumers. Reviewed by: attilio jhb jb Approved by: gnn (mentor)
65 lines
2.1 KiB
C
65 lines
2.1 KiB
C
/*-
|
|
* Copyright 2008-2009 Stacey Son <sson@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 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 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Backend for the lock tracing (lockstat) kernel support. This is required
|
|
* to allow a module to load even though DTrace kernel support may not be
|
|
* present.
|
|
*
|
|
*/
|
|
|
|
#include "opt_kdtrace.h"
|
|
|
|
#ifdef KDTRACE_HOOKS
|
|
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <sys/lockstat.h>
|
|
|
|
/*
|
|
* The following must match the type definition of dtrace_probe. It is
|
|
* defined this way to avoid having to rely on CDDL code.
|
|
*/
|
|
uint32_t lockstat_probemap[LS_NPROBES];
|
|
void (*lockstat_probe_func)(uint32_t, uintptr_t, uintptr_t,
|
|
uintptr_t, uintptr_t, uintptr_t);
|
|
|
|
|
|
uint64_t
|
|
lockstat_nsecs(void)
|
|
{
|
|
struct bintime bt;
|
|
uint64_t ns;
|
|
|
|
binuptime(&bt);
|
|
ns = bt.sec * (uint64_t)1000000000;
|
|
ns += ((uint64_t)1000000000 * (uint32_t)(bt.frac >> 32)) >> 32;
|
|
return (ns);
|
|
}
|
|
|
|
#endif /* KDTRACE_HOOKS */
|