diff options
| author | fabient <fabient@FreeBSD.org> | 2012-03-28 20:58:30 +0000 |
|---|---|---|
| committer | fabient <fabient@FreeBSD.org> | 2012-03-28 20:58:30 +0000 |
| commit | 5edfb77dd3a164bb9d2d40c6604faa6c9f3dce15 (patch) | |
| tree | fadff08d26576c3d5c1cef9d47abd784602b237a /sys/kern/kern_mutex.c | |
| parent | 9a7982e5a0267c0421856f3a43a1ae75880058f3 (diff) | |
| download | FreeBSD-src-5edfb77dd3a164bb9d2d40c6604faa6c9f3dce15.zip FreeBSD-src-5edfb77dd3a164bb9d2d40c6604faa6c9f3dce15.tar.gz | |
Add software PMC support.
New kernel events can be added at various location for sampling or counting.
This will for example allow easy system profiling whatever the processor is
with known tools like pmcstat(8).
Simultaneous usage of software PMC and hardware PMC is possible, for example
looking at the lock acquire failure, page fault while sampling on
instructions.
Sponsored by: NETASQ
MFC after: 1 month
Diffstat (limited to 'sys/kern/kern_mutex.c')
| -rw-r--r-- | sys/kern/kern_mutex.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/sys/kern/kern_mutex.c b/sys/kern/kern_mutex.c index bfb6547..f718ca0 100644 --- a/sys/kern/kern_mutex.c +++ b/sys/kern/kern_mutex.c @@ -39,6 +39,7 @@ __FBSDID("$FreeBSD$"); #include "opt_adaptive_mutexes.h" #include "opt_ddb.h" #include "opt_global.h" +#include "opt_hwpmc_hooks.h" #include "opt_kdtrace.h" #include "opt_sched.h" @@ -76,6 +77,11 @@ __FBSDID("$FreeBSD$"); #define ADAPTIVE_MUTEXES #endif +#ifdef HWPMC_HOOKS +#include <sys/pmckern.h> +PMC_SOFT_DEFINE( , , lock, failed); +#endif + /* * Internal utility macros. */ @@ -364,6 +370,9 @@ _mtx_lock_sleep(struct mtx *m, uintptr_t tid, int opts, const char *file, return; } +#ifdef HWPMC_HOOKS + PMC_SOFT_CALL( , , lock, failed); +#endif lock_profile_obtain_lock_failed(&m->lock_object, &contested, &waittime); if (LOCK_LOG_TEST(&m->lock_object, opts)) @@ -529,6 +538,9 @@ _mtx_lock_spin(struct mtx *m, uintptr_t tid, int opts, const char *file, if (LOCK_LOG_TEST(&m->lock_object, opts)) CTR1(KTR_LOCK, "_mtx_lock_spin: %p spinning", m); +#ifdef HWPMC_HOOKS + PMC_SOFT_CALL( , , lock, failed); +#endif lock_profile_obtain_lock_failed(&m->lock_object, &contested, &waittime); while (!_mtx_obtain_lock(m, tid)) { @@ -600,6 +612,9 @@ retry: m->mtx_recurse++; break; } +#ifdef HWPMC_HOOKS + PMC_SOFT_CALL( , , lock, failed); +#endif lock_profile_obtain_lock_failed(&m->lock_object, &contested, &waittime); /* Give interrupts a chance while we spin. */ |
