Commit 9a0f05cb authored Nov 21, 2011 by Peter Zijlstra Committed by Ingo Molnar Dec 21, 2011

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>

parent f1ac18af

kernel/events/core.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);