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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2011-11-21 15:13:29 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-12-21 11:01:05 +0100 |
| commit | 9a0f05cb36888550d1509d60aa55788615abea44 (patch) | |
| tree | db001d4345d12cad98b7df4f29ca98e572087a7a /kernel/events | |
| parent | perf: Add support for PERF_HW_COUNT_REF_CPU_CYCLES (diff) | |
| download | linux-9a0f05cb36888550d1509d60aa55788615abea44.tar.xz linux-9a0f05cb36888550d1509d60aa55788615abea44.zip | |
perf: Update the mmap control page on mmap()
Apparently we didn't update the mmap control page right after mmap(),
which leads to surprises when userspace wants to use it.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Cc: Arun Sharma <asharma@fb.com>
Link: http://lkml.kernel.org/n/tip-dcpi7164djsexmx6ya7lilrc@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/events')
| -rw-r--r-- | kernel/events/core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 2f8f3f103cb4..0ca1f648ac08 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3534,6 +3534,8 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma) event->mmap_user = get_current_user(); vma->vm_mm->pinned_vm += event->mmap_locked; + perf_event_update_userpage(event); + unlock: if (!ret) atomic_inc(&event->mmap_count); |