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| author | Vince Weaver <vweaver1@eecs.utk.edu> | 2011-06-03 17:54:40 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-06-04 12:22:04 +0200 |
| commit | aa4a221875873d2a1f9656cb7fd7e545e952b4fa (patch) | |
| tree | 44f66345c06c94cfc95d17b337d45e09917e475d /kernel/sysctl.c | |
| parent | 710054ba25c0d1f8f41c22ce13ba336503fb5318 (diff) | |
| download | lwn-aa4a221875873d2a1f9656cb7fd7e545e952b4fa.tar.gz lwn-aa4a221875873d2a1f9656cb7fd7e545e952b4fa.zip | |
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>
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 4fc92445a29c..f175d98bd355 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -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, |