From 5c891f3840a7a330c96d7203d4bb5be6fa033724 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Tue, 30 Nov 2010 17:49:55 +0000 Subject: [PATCH] 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 Cc: Peter Zijlstra Cc: Frederic Weisbecker LKML-Reference: <20101130163820.398713983@linutronix.de> Signed-off-by: Thomas Gleixner Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/session.c | 21 ++++++++++++++++----- tools/perf/util/session.h | 3 +++ 2 files changed, 19 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c index 9fef587ff11f..52672dad1fe9 100644 --- a/tools/perf/util/session.c +++ b/tools/perf/util/session.c @@ -114,6 +114,7 @@ struct perf_session *perf_session__new(const char *filename, int mode, bool forc self->repipe = repipe; INIT_LIST_HEAD(&self->ordered_samples.samples); INIT_LIST_HEAD(&self->ordered_samples.sample_cache); + INIT_LIST_HEAD(&self->ordered_samples.to_free); machine__init(&self->host_machine, "", HOST_KERNEL_ID); if (mode == O_RDONLY) { @@ -403,10 +404,10 @@ static void perf_session_free_sample_buffers(struct perf_session *session) { struct ordered_samples *os = &session->ordered_samples; - while (!list_empty(&os->sample_cache)) { + while (!list_empty(&os->to_free)) { struct sample_queue *sq; - sq = list_entry(os->sample_cache.next, struct sample_queue, list); + sq = list_entry(os->to_free.next, struct sample_queue, list); list_del(&sq->list); free(sq); } @@ -538,10 +539,13 @@ static void __queue_sample_event(struct sample_queue *new, } } +#define MAX_SAMPLE_BUFFER (64 * 1024 / sizeof(struct sample_queue)) + static int queue_sample_event(event_t *event, struct sample_data *data, struct perf_session *s) { - struct list_head *sc = &s->ordered_samples.sample_cache; + struct ordered_samples *os = &s->ordered_samples; + struct list_head *sc = &os->sample_cache; u64 timestamp = data->time; struct sample_queue *new; @@ -553,10 +557,17 @@ static int queue_sample_event(event_t *event, struct sample_data *data, if (!list_empty(sc)) { new = list_entry(sc->next, struct sample_queue, list); list_del(&new->list); + } else if (os->sample_buffer) { + new = os->sample_buffer + os->sample_buffer_idx; + if (++os->sample_buffer_idx == MAX_SAMPLE_BUFFER) + os->sample_buffer = NULL; } else { - new = malloc(sizeof(*new)); - if (!new) + os->sample_buffer = malloc(MAX_SAMPLE_BUFFER * sizeof(*new)); + if (!os->sample_buffer) return -ENOMEM; + list_add(&os->sample_buffer->list, &os->to_free); + os->sample_buffer_idx = 2; + new = os->sample_buffer + 1; } new->timestamp = timestamp; diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h index e4a7ff2ba8d5..5bf6efa3788a 100644 --- a/tools/perf/util/session.h +++ b/tools/perf/util/session.h @@ -19,7 +19,10 @@ struct ordered_samples { u64 max_timestamp; struct list_head samples; struct list_head sample_cache; + struct list_head to_free; + struct sample_queue *sample_buffer; struct sample_queue *last_sample; + int sample_buffer_idx; }; struct perf_session { -- 2.20.1