Messages in this thread Patch in this message | | | Date | Sat, 4 Jun 2011 11:06:06 GMT | From | tip-bot for Vince Weaver <> | Subject | [tip:perf/core] perf: Comment /proc/sys/kernel/perf_event_paranoid to be part of user ABI |
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Commit-ID: aa4a221875873d2a1f9656cb7fd7e545e952b4fa Gitweb: http://git.kernel.org/tip/aa4a221875873d2a1f9656cb7fd7e545e952b4fa Author: Vince Weaver <vweaver1@eecs.utk.edu> AuthorDate: Fri, 3 Jun 2011 17:54:40 -0400 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Sat, 4 Jun 2011 12:22:04 +0200
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> --- kernel/sysctl.c | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 4fc9244..f175d98 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,
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