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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: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2009-05-04 18:54:32 +02:00
parent dab6f6a340
commit b82914ce33
1 changed files with 3 additions and 7 deletions
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10
kernel/perf_counter.c
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@ -1069,18 +1069,14 @@ void perf_counter_task_tick(struct task_struct *curr, int cpu)
{ {
struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu); struct perf_cpu_context *cpuctx = &per_cpu(perf_cpu_context, cpu);
struct perf_counter_context *ctx = &curr->perf_counter_ctx; 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_cpu_sched_out(cpuctx);
perf_counter_task_sched_out(curr, cpu); perf_counter_task_sched_out(curr, cpu);
if (rotate_percpu) rotate_ctx(&cpuctx->ctx);
rotate_ctx(&cpuctx->ctx);
rotate_ctx(ctx); rotate_ctx(ctx);
if (rotate_percpu) perf_counter_cpu_sched_in(cpuctx, cpu);
perf_counter_cpu_sched_in(cpuctx, cpu);
perf_counter_task_sched_in(curr, cpu); perf_counter_task_sched_in(curr, cpu);
} }