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perf: Remove fragile swevent hlist optimization

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Currently we only allocate a single cpu hashtable for per-cpu
swevents; do away with this optimization for it is fragile in the face
of things like perf_pmu_migrate_context().

The easiest thing is to make sure all CPUs are consistent wrt state.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20130913111447.GN31370@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2013-09-13 13:14:47 +02:00 • committed by Ingo Molnar
parent d5b5f391d4
commit 06db0b2171
1 changed files with 0 additions and 8 deletions
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8
kernel/events/core.c
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@ -5680,11 +5680,6 @@ static void swevent_hlist_put(struct perf_event *event)
{ {
int cpu; int cpu;
if (event->cpu != -1) {
swevent_hlist_put_cpu(event, event->cpu);
return;
}
for_each_possible_cpu(cpu) for_each_possible_cpu(cpu)
swevent_hlist_put_cpu(event, cpu); swevent_hlist_put_cpu(event, cpu);
} }
@ -5718,9 +5713,6 @@ static int swevent_hlist_get(struct perf_event *event)
int err; int err;
int cpu, failed_cpu; int cpu, failed_cpu;
if (event->cpu != -1)
return swevent_hlist_get_cpu(event, event->cpu);
get_online_cpus(); get_online_cpus();
for_each_possible_cpu(cpu) { for_each_possible_cpu(cpu) {
err = swevent_hlist_get_cpu(event, cpu); err = swevent_hlist_get_cpu(event, cpu);