Messages in this thread |  | | Subject | Re: perf: prctl(PR_TASK_PERF_EVENTS_DISABLE) has no effect | From | Peter Zijlstra <> | Date | Mon, 30 Jan 2012 10:52:36 +0100 |
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On Sun, 2012-01-29 at 17:32 +0100, Ingo Molnar wrote: > * Andrew Steets <asteets@rgmadvisors.com> wrote: > > > On 1/28/12 6:01 AM, Ingo Molnar wrote: > > > > >> prctl(PR_TASK_PERF_EVENTS_DISABLE) doesn't appear to > > >> disable perf event counters. Here is a demonstration > > >> program: > > > > > > btw., what's your usecase? > > > > I'm trying to profile a small section of a long-running > > program. I ran into trouble using call-graph recording and I > > thought this might be an alternative way of getting what I was > > after. > > That usecase indeed makes sense. Peter, could we allow this for > privileged tasks, depending on the perf_paranoia settings or > such?
I really dislike it. The sane way around this would be to allow easy self-profiling instead of doing things arse about face like that.
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