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perf counters: add prctl interface to disable/enable counters

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Add a way for self-monitoring tasks to disable/enable counters summarily,
via a prctl:

	PR_TASK_PERF_COUNTERS_DISABLE		31
	PR_TASK_PERF_COUNTERS_ENABLE		32

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-12-11 14:59:31 +01:00
parent bae43c9945
commit 1d1c7ddbfa
4 changed files with 93 additions and 7 deletions
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7
kernel/sys.c
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@@ -14,6 +14,7 @@
#include <linux/prctl.h>
#include <linux/highuid.h>
#include <linux/fs.h>
#include <linux/perf_counter.h>
#include <linux/resource.h>
#include <linux/kernel.h>
#include <linux/kexec.h>
@@ -1716,6 +1717,12 @@ asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
case PR_SET_TSC:
error = SET_TSC_CTL(arg2);
break;
case PR_TASK_PERF_COUNTERS_DISABLE:
error = perf_counter_task_disable();
break;
case PR_TASK_PERF_COUNTERS_ENABLE:
error = perf_counter_task_enable();
break;
case PR_GET_TIMERSLACK:
error = current->timer_slack_ns;
break;