perf session: Allocate chunks of sample objects
The ordered sample code allocates singular reference objects struct sample_queue which have 48byte size on 64bit and 20 bytes on 32bit. That's silly. Allocate ~64k sized chunks and hand them out. Performance gain: ~ 15% Cc: Ingo Molnar <mingo@elte.hu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <20101130163820.398713983@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -114,6 +114,7 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc
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self->repipe = repipe;
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INIT_LIST_HEAD(&self->ordered_samples.samples);
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INIT_LIST_HEAD(&self->ordered_samples.sample_cache);
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INIT_LIST_HEAD(&self->ordered_samples.to_free);
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machine__init(&self->host_machine, "", HOST_KERNEL_ID);
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if (mode == O_RDONLY) {
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@ -403,10 +404,10 @@ static void perf_session_free_sample_buffers(struct perf_session *session)
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{
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struct ordered_samples *os = &session->ordered_samples;
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while (!list_empty(&os->sample_cache)) {
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while (!list_empty(&os->to_free)) {
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struct sample_queue *sq;
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sq = list_entry(os->sample_cache.next, struct sample_queue, list);
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sq = list_entry(os->to_free.next, struct sample_queue, list);
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list_del(&sq->list);
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free(sq);
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}
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@ -538,10 +539,13 @@ static void __queue_sample_event(struct sample_queue *new,
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}
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}
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#define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue))
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static int queue_sample_event(event_t *event, struct sample_data *data,
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struct perf_session *s)
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{
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struct list_head *sc = &s->ordered_samples.sample_cache;
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struct ordered_samples *os = &s->ordered_samples;
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struct list_head *sc = &os->sample_cache;
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u64 timestamp = data->time;
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struct sample_queue *new;
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@ -553,10 +557,17 @@ static int queue_sample_event(event_t *event, struct sample_data *data,
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if (!list_empty(sc)) {
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new = list_entry(sc->next, struct sample_queue, list);
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list_del(&new->list);
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} else if (os->sample_buffer) {
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new = os->sample_buffer + os->sample_buffer_idx;
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if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER)
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os->sample_buffer = NULL;
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} else {
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new = malloc(sizeof(*new));
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if (!new)
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os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new));
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if (!os->sample_buffer)
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return -ENOMEM;
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list_add(&os->sample_buffer->list, &os->to_free);
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os->sample_buffer_idx = 2;
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new = os->sample_buffer + 1;
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}
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new->timestamp = timestamp;
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@ -19,7 +19,10 @@ struct ordered_samples {
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u64 max_timestamp;
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struct list_head samples;
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struct list_head sample_cache;
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struct list_head to_free;
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struct sample_queue *sample_buffer;
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struct sample_queue *last_sample;
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int sample_buffer_idx;
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};
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struct perf_session {
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