Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [RFC 4/5] perf: Add pmu callbacks to track event mapping and unmapping | Date | Tue, 14 Oct 2014 15:57:38 -0700 |
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Signed-off-by: Andy Lutomirski <luto@amacapital.net> --- include/linux/perf_event.h | 7 +++++++ kernel/events/core.c | 9 +++++++++ 2 files changed, 16 insertions(+)
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h index 707617a8c0f6..88069e319a3f 100644 --- a/include/linux/perf_event.h +++ b/include/linux/perf_event.h @@ -206,6 +206,13 @@ 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 963bf139e2b2..dc73e9723748 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -4008,6 +4008,9 @@ 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); } /* @@ -4027,6 +4030,9 @@ 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)) @@ -4228,6 +4234,9 @@ 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; } -- 1.9.3
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