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perfcounters: enable lowlevel pmc code to schedule counters

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Allow lowlevel ->enable() op to return an error if a counter can not be
added. This can be used to handle counter constraints.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar
2008-12-21 13:50:42 +01:00
parent 78b6084c90
commit 95cdd2e785
3 changed files with 51 additions and 19 deletions
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2
include/linux/perf_counter.h
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@@ -128,7 +128,7 @@ struct perf_counter;
* struct hw_perf_counter_ops - performance counter hw ops
*/
struct hw_perf_counter_ops {
void (*enable) (struct perf_counter *counter);
int (*enable) (struct perf_counter *counter);
void (*disable) (struct perf_counter *counter);
void (*read) (struct perf_counter *counter);
};