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authorIngo Molnar <mingo@elte.hu>2008-12-11 14:59:31 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-11 15:45:55 +0100
commit1d1c7ddbfab358445a542715551301b7fc363e28 (patch)
treed4421834d109b206f39c2019ea039fd42ed22e1d /kernel/sys.c
parentbae43c9945ebeef15e7952e317efb02393d3bfc7 (diff)
downloadop-kernel-dev-1d1c7ddbfab358445a542715551301b7fc363e28.zip
op-kernel-dev-1d1c7ddbfab358445a542715551301b7fc363e28.tar.gz
perf counters: add prctl interface to disable/enable counters
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>
Diffstat (limited to 'kernel/sys.c')
-rw-r--r--kernel/sys.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sys.c b/kernel/sys.c
index 31deba8..0f66633 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -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;
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