diff options
| author | Andy Lutomirski <luto@amacapital.net> | 2014-10-24 15:58:10 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-02-04 12:10:45 +0100 |
| commit | 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb (patch) | |
| tree | 1f956e500f6793fba62fd528134310253edda76c | |
| parent | 22c4bd9fa921c2b1b3f2420d7b9dabbe982f3059 (diff) | |
perf: Add pmu callbacks to track event mapping and unmapping
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Vince Weaver <vince@deater.net>
Cc: "hillf.zj" <hillf.zj@alibaba-inc.com>
Cc: Valdis Kletnieks <Valdis.Kletnieks@vt.edu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
| -rw-r--r-- | include/linux/perf_event.h | 7 | ||||
| -rw-r--r-- | kernel/events/core.c | 9 |
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 5cad0e6f3552..33262004c310 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -202,6 +202,13 @@ struct pmu { */ int (*event_init) (struct perf_event *event); + /* + * Notification that the event was mapped or unmapped. Called + * in the context of the mapping task. + */ + void (*event_mapped) (struct perf_event *event); /*optional*/ + void (*event_unmapped) (struct perf_event *event); /*optional*/ + #define PERF_EF_START 0x01 /* start the counter when adding */ #define PERF_EF_RELOAD 0x02 /* reload the counter when starting */ #define PERF_EF_UPDATE 0x04 /* update the counter when stopping */ diff --git a/kernel/events/core.c b/kernel/events/core.c index 7f2fbb8b5069..cc1487145d33 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4293,6 +4293,9 @@ static void perf_mmap_open(struct vm_area_struct *vma) atomic_inc(&event->mmap_count); atomic_inc(&event->rb->mmap_count); + + if (event->pmu->event_mapped) + event->pmu->event_mapped(event); } /* @@ -4312,6 +4315,9 @@ static void perf_mmap_close(struct vm_area_struct *vma) int mmap_locked = rb->mmap_locked; unsigned long size = perf_data_size(rb); + if (event->pmu->event_unmapped) + event->pmu->event_unmapped(event); + atomic_dec(&rb->mmap_count); if (!atomic_dec_and_mutex_lock(&event->mmap_count, &event->mmap_mutex)) @@ -4513,6 +4519,9 @@ unlock: vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND | VM_DONTDUMP; vma->vm_ops = &perf_mmap_vmops; + if (event->pmu->event_mapped) + event->pmu->event_mapped(event); + return ret; } |