Commit-ID: 1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb Gitweb: http://git.kernel.org/tip/1e0fb9ec679c9273a641f1d6f3d25ea47baef2bb Author: Andy Lutomirski <[email protected]> AuthorDate: Fri, 24 Oct 2014 15:58:10 -0700 Committer: Ingo Molnar <[email protected]> CommitDate: Wed, 4 Feb 2015 12:10:45 +0100
perf: Add pmu callbacks to track event mapping and unmapping Signed-off-by: Andy Lutomirski <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Kees Cook <[email protected]> Cc: Andrea Arcangeli <[email protected]> Cc: Vince Weaver <[email protected]> Cc: "hillf.zj" <[email protected]> Cc: Valdis Kletnieks <[email protected]> Cc: Linus Torvalds <[email protected]> Link: http://lkml.kernel.org/r/266afcba1d1f91ea5501e4e16e94bbbc1a9339b6.1414190806.git.l...@amacapital.net Signed-off-by: Ingo Molnar <[email protected]> --- 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 5cad0e6..3326200 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 7f2fbb8..cc14871 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
