Commit aa4a2218 authored Jun 03, 2011 by Vince Weaver Committed by Ingo Molnar Jun 04, 2011

perf: Comment /proc/sys/kernel/perf_event_paranoid to be part of user ABI



Turns out that distro packages use this file as an indicator of
the perf event subsystem - this is easier to check for from scripts
than the existence of the system call.

This is easy enough to keep around for the kernel, so add a
comment to make sure it stays so.

Signed-off-by: Vince Weaver <vweaver1@eecs.utk.edu>
Cc: David Ahern <dsahern@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: paulus@samba.org
Cc: acme@redhat.com
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.00.1106031751170.29381@cl320.eecs.utk.edu


Signed-off-by: Ingo Molnar <mingo@elte.hu>

parent 710054ba

kernel/sysctl.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -938,6 +938,12 @@ static struct ctl_table kern_table[] = {
		},
		#endif
		#ifdef CONFIG_PERF_EVENTS
		/*
		* User-space scripts rely on the existence of this file
		* as a feature check for perf_events being enabled.
		*
		* So it's an ABI, do not remove!
		*/
		{
		.procname = "perf_event_paranoid",
		.data = &sysctl_perf_event_paranoid,