Messages in this thread | | | Subject | Re: perf: prctl(PR_TASK_PERF_EVENTS_DISABLE) has no effect | From | Peter Zijlstra <> | Date | Fri, 27 Jan 2012 22:34:23 +0100 |
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On Fri, 2012-01-27 at 14:06 -0600, Andrew Steets wrote: > On 1/27/12 11:12 AM, Peter Zijlstra wrote: > > On Fri, 2012-01-27 at 11:03 -0600, Andrew Steets wrote: > >> Can anyone tell > >> me if I'm using this wrong or if this is a bug? > > > > You're using it wrong, it will disable events you own (created) not > > events that monitor you. > > Is there an alternate way of disabling events that monitor the current > process?
Nope, nor will there ever be.
> I ask because I came across the following description in > tools/perf/design.txt: > > A process can enable or disable all the counter groups that are > attached to it, using prctl: > > prctl(PR_TASK_PERF_EVENTS_ENABLE); > > prctl(PR_TASK_PERF_EVENTS_DISABLE); > > This applies to all counters on the current process, whether created > by this process or by another, and doesn't affect any counters that > this process has created on other processes. It only enables or > disables the group leaders, not any other members in the groups.
That's wrong.. also I wouldn't ever allow such a 'feature', that's just asking for trouble.
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