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>
This commit is contained in:
Peter Zijlstra 2011-11-21 15:13:29 +01:00 committed by Ingo Molnar
parent f1ac18af21
commit 9a0f05cb36
1 changed files with 2 additions and 0 deletions

View File

@ -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);