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Commit b82914ce authored by Ingo Molnar's avatar Ingo Molnar
Browse files

perf_counter: round-robin per-CPU counters too 



This used to be unstable when we had the rq->lock dependencies,
but now that they are that of the past we can turn on percpu
counter RR too.

[ Impact: handle counter over-commit for per-CPU counters too ]

LKML-Reference: <new-submission>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent dab6f6a3

kernel/perf_counter.c

+3 −7
Original line number Diff line number Diff line
@@ -1069,17 +1069,13 @@ void perf_counter_task_tick(struct task_struct *curr, int cpu) 
{

	struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);

	struct perf_counter_context *ctx = &curr->perf_counter_ctx;

	const int rotate_percpu = 0;



	if (rotate_percpu)

	perf_counter_cpu_sched_out(cpuctx);

	perf_counter_task_sched_out(curr, cpu);



	if (rotate_percpu)

	rotate_ctx(&cpuctx->ctx);

	rotate_ctx(ctx);



	if (rotate_percpu)

	perf_counter_cpu_sched_in(cpuctx, cpu);

	perf_counter_task_sched_in(curr, cpu);

}