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perf_counter: Optimize sched in/out of counters

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Avoid a function call for !group counters by directly calling the counter
function.

[ Impact: micro-optimize the code ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090520102553.511933670@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-05-20 12:21:22 +02:00 committed by Ingo Molnar
parent b986d7ec0f
commit afedadf23a
1 changed files with 19 additions and 6 deletions
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25
kernel/perf_counter.c
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@ -826,8 +826,12 @@ void __perf_counter_sched_out(struct perf_counter_context *ctx,
perf_disable();
if (ctx->nr_active) {
list_for_each_entry(counter, &ctx->counter_list, list_entry)
group_sched_out(counter, cpuctx, ctx);
list_for_each_entry(counter, &ctx->counter_list, list_entry) {
if (counter != counter->group_leader)
counter_sched_out(counter, cpuctx, ctx);
else
group_sched_out(counter, cpuctx, ctx);
}
}
perf_enable();
out:
@ -903,8 +907,12 @@ __perf_counter_sched_in(struct perf_counter_context *ctx,
if (counter->cpu != -1 && counter->cpu != cpu)
continue;
if (group_can_go_on(counter, cpuctx, 1))
group_sched_in(counter, cpuctx, ctx, cpu);
if (counter != counter->group_leader)
counter_sched_in(counter, cpuctx, ctx, cpu);
else {
if (group_can_go_on(counter, cpuctx, 1))
group_sched_in(counter, cpuctx, ctx, cpu);
}
/*
* If this pinned group hasn't been scheduled,
@ -932,9 +940,14 @@ __perf_counter_sched_in(struct perf_counter_context *ctx,
if (counter->cpu != -1 && counter->cpu != cpu)
continue;
if (group_can_go_on(counter, cpuctx, can_add_hw)) {
if (group_sched_in(counter, cpuctx, ctx, cpu))
if (counter != counter->group_leader) {
if (counter_sched_in(counter, cpuctx, ctx, cpu))
can_add_hw = 0;
} else {
if (group_can_go_on(counter, cpuctx, can_add_hw)) {
if (group_sched_in(counter, cpuctx, ctx, cpu))
can_add_hw = 0;
}
}
}
perf_enable();