lkml.org 
[lkml]   [2011]   [Jun]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[tip:perf/core] perf: Comment /proc/sys/kernel/perf_event_paranoid to be part of user ABI
    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,

    \
     
     \ /
      Last update: 2011-06-04 13:09    [W:0.025 / U:31.812 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site