Commit 7f8b4e4e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf_counter: Add scale information to the mmap control page 



Add the needed time scale to the self-profile mmap information.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 41f95331

include/linux/perf_counter.h

+3 −1
Original line number Diff line number Diff line
@@ -232,12 +232,14 @@ struct perf_counter_mmap_page { 
	__u32	lock;			/* seqlock for synchronization */

	__u32	index;			/* hardware counter identifier */

	__s64	offset;			/* add to hardware counter value */

	__u64	time_enabled;		/* time counter active */

	__u64	time_running;		/* time counter on cpu */



		/*

		 * Hole for extension of the self monitor capabilities

		 */



	__u64	__reserved[125];	/* align to 1k */

	__u64	__reserved[123];	/* align to 1k */



	/*

	 * Control data for the mmap() data buffer.

kernel/perf_counter.c

+6 −0
Original line number Diff line number Diff line
@@ -1782,6 +1782,12 @@ void perf_counter_update_userpage(struct perf_counter *counter) 
	if (counter->state == PERF_COUNTER_STATE_ACTIVE)

		userpg->offset -= atomic64_read(&counter->hw.prev_count);



	userpg->time_enabled = counter->total_time_enabled +

			atomic64_read(&counter->child_total_time_enabled);



	userpg->time_running = counter->total_time_running +

			atomic64_read(&counter->child_total_time_running);



	barrier();

	++userpg->lock;

	preempt_enable();