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| 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_clock.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_clock.c')
| -rw-r--r-- | sys/kern/kern_clock.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sys/kern/kern_clock.c b/sys/kern/kern_clock.c index fdc1302..57dd632 100644 --- a/sys/kern/kern_clock.c +++ b/sys/kern/kern_clock.c @@ -74,6 +74,8 @@ __FBSDID("$FreeBSD$"); #ifdef HWPMC_HOOKS #include <sys/pmckern.h> +PMC_SOFT_DEFINE( , , clock, hard); +PMC_SOFT_DEFINE( , , clock, stat); #endif #ifdef DEVICE_POLLING @@ -446,9 +448,11 @@ hardclock_cpu(int usermode) td->td_flags |= flags; thread_unlock(td); -#ifdef HWPMC_HOOKS +#ifdef HWPMC_HOOKS if (PMC_CPU_HAS_SAMPLES(PCPU_GET(cpuid))) PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); + if (td->td_intr_frame != NULL) + PMC_SOFT_CALL_TF( , , clock, hard, td->td_intr_frame); #endif callout_tick(); } @@ -537,6 +541,8 @@ hardclock_cnt(int cnt, int usermode) #ifdef HWPMC_HOOKS if (PMC_CPU_HAS_SAMPLES(PCPU_GET(cpuid))) PMC_CALL_HOOK_UNLOCKED(curthread, PMC_FN_DO_SAMPLES, NULL); + if (td->td_intr_frame != NULL) + PMC_SOFT_CALL_TF( , , clock, hard, td->td_intr_frame); #endif callout_tick(); /* We are in charge to handle this tick duty. */ @@ -758,6 +764,10 @@ statclock_cnt(int cnt, int usermode) for ( ; cnt > 0; cnt--) sched_clock(td); thread_unlock(td); +#ifdef HWPMC_HOOKS + if (td->td_intr_frame != NULL) + PMC_SOFT_CALL_TF( , , clock, stat, td->td_intr_frame); +#endif } void |
