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_lock.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_lock.c')
| -rw-r--r-- | sys/kern/kern_lock.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/sys/kern/kern_lock.c b/sys/kern/kern_lock.c index 00f1b11..24526b0 100644 --- a/sys/kern/kern_lock.c +++ b/sys/kern/kern_lock.c @@ -28,6 +28,7 @@ #include "opt_adaptive_lockmgrs.h" #include "opt_ddb.h" +#include "opt_hwpmc_hooks.h" #include "opt_kdtrace.h" #include <sys/cdefs.h> @@ -53,6 +54,11 @@ __FBSDID("$FreeBSD$"); #include <ddb/ddb.h> #endif +#ifdef HWPMC_HOOKS +#include <sys/pmckern.h> +PMC_SOFT_DECLARE( , , lock, failed); +#endif + CTASSERT(((LK_ADAPTIVE | LK_NOSHARE) & LO_CLASSFLAGS) == (LK_ADAPTIVE | LK_NOSHARE)); CTASSERT(LK_UNLOCKED == (LK_UNLOCKED & @@ -514,6 +520,9 @@ __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk, break; continue; } +#ifdef HWPMC_HOOKS + PMC_SOFT_CALL( , , lock, failed); +#endif lock_profile_obtain_lock_failed(&lk->lock_object, &contested, &waittime); @@ -744,6 +753,9 @@ __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk, while (!atomic_cmpset_acq_ptr(&lk->lk_lock, LK_UNLOCKED, tid)) { +#ifdef HWPMC_HOOKS + PMC_SOFT_CALL( , , lock, failed); +#endif lock_profile_obtain_lock_failed(&lk->lock_object, &contested, &waittime); @@ -1056,6 +1068,9 @@ __lockmgr_args(struct lock *lk, u_int flags, struct lock_object *ilk, } while (!atomic_cmpset_acq_ptr(&lk->lk_lock, LK_UNLOCKED, tid)) { +#ifdef HWPMC_HOOKS + PMC_SOFT_CALL( , , lock, failed); +#endif lock_profile_obtain_lock_failed(&lk->lock_object, &contested, &waittime); |
