Messages in this thread | | | Date | Fri, 27 Jan 2012 14:06:48 -0600 | From | Andrew Steets <> | Subject | Re: perf: prctl(PR_TASK_PERF_EVENTS_DISABLE) has no effect |
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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? 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.
-Andrew
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