Messages in this thread Patch in this message |  | | Date | Tue, 23 Jun 2009 10:04:11 GMT | From | tip-bot for Peter Zijlstra <> | Subject | [tip:perfcounters/urgent] perf_counter: Optimize perf_counter_alloc()'s inherit case |
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Commit-ID: f344011ccb85469445369153c3d27c4ee4bc2ac8 Gitweb: http://git.kernel.org/tip/f344011ccb85469445369153c3d27c4ee4bc2ac8 Author: Peter Zijlstra <a.p.zijlstra@chello.nl> AuthorDate: Mon, 22 Jun 2009 13:58:35 +0200 Committer: Ingo Molnar <mingo@elte.hu> CommitDate: Tue, 23 Jun 2009 11:42:46 +0200
perf_counter: Optimize perf_counter_alloc()'s inherit case
We don't need to add usage counts for swcounter and attr usage models for inherited counters since the parent counter will always have one, which suffices to generate the needed output.
This avoids up to 3 global atomic increments per inherited counter.
LKML-Reference: <new-submission> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
--- kernel/perf_counter.c | 32 ++++++++++++++++++++------------ 1 files changed, 20 insertions(+), 12 deletions(-)
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 0a45490..c2b19c1 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -1508,11 +1508,13 @@ static void free_counter(struct perf_counter *counter) { perf_pending_sync(counter); - atomic_dec(&nr_counters); - if (counter->attr.mmap) - atomic_dec(&nr_mmap_counters); - if (counter->attr.comm) - atomic_dec(&nr_comm_counters); + if (!counter->parent) { + atomic_dec(&nr_counters); + if (counter->attr.mmap) + atomic_dec(&nr_mmap_counters); + if (counter->attr.comm) + atomic_dec(&nr_comm_counters); + } if (counter->destroy) counter->destroy(counter); @@ -3515,6 +3517,8 @@ static void sw_perf_counter_destroy(struct perf_counter *counter) { u64 event = counter->attr.config; + WARN_ON(counter->parent); + atomic_dec(&perf_swcounter_enabled[event]); } @@ -3551,8 +3555,10 @@ static const struct pmu *sw_perf_counter_init(struct perf_counter *counter) case PERF_COUNT_SW_PAGE_FAULTS_MAJ: case PERF_COUNT_SW_CONTEXT_SWITCHES: case PERF_COUNT_SW_CPU_MIGRATIONS: - atomic_inc(&perf_swcounter_enabled[event]); - counter->destroy = sw_perf_counter_destroy; + if (!counter->parent) { + atomic_inc(&perf_swcounter_enabled[event]); + counter->destroy = sw_perf_counter_destroy; + } pmu = &perf_ops_generic; break; } @@ -3663,11 +3669,13 @@ done: counter->pmu = pmu; - atomic_inc(&nr_counters); - if (counter->attr.mmap) - atomic_inc(&nr_mmap_counters); - if (counter->attr.comm) - atomic_inc(&nr_comm_counters); + if (!counter->parent) { + atomic_inc(&nr_counters); + if (counter->attr.mmap) + atomic_inc(&nr_mmap_counters); + if (counter->attr.comm) + atomic_inc(&nr_comm_counters); + } return counter; }
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