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perfcounters: tweak group scheduling 

Impact: schedule in groups atomically

If there are multiple groups in a task, make sure they are scheduled
in and out atomically.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-12-17 08:54:56 +01:00
parent 8fb9331391
commit 7995888fcb
1 changed files with 13 additions and 3 deletions
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16
kernel/perf_counter.c
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@ -367,21 +367,26 @@ counter_sched_in(struct perf_counter *counter,
ctx->nr_active++;
}
static void
static int
group_sched_in(struct perf_counter *group_counter,
struct perf_cpu_context *cpuctx,
struct perf_counter_context *ctx,
int cpu)
{
struct perf_counter *counter;
int was_group = 0;
counter_sched_in(group_counter, cpuctx, ctx, cpu);
/*
* Schedule in siblings as one group (if any):
*/
list_for_each_entry(counter, &group_counter->sibling_list, list_entry)
list_for_each_entry(counter, &group_counter->sibling_list, list_entry) {
counter_sched_in(counter, cpuctx, ctx, cpu);
was_group = 1;
}
return was_group;
}
/*
@ -416,7 +421,12 @@ void perf_counter_task_sched_in(struct task_struct *task, int cpu)
if (counter->cpu != -1 && counter->cpu != cpu)
continue;
group_sched_in(counter, cpuctx, ctx, cpu);
/*
* If we scheduled in a group atomically and
* exclusively, break out:
*/
if (group_sched_in(counter, cpuctx, ctx, cpu))
break;
}
spin_unlock(&ctx->lock);