From 0983cc0dbca45250cbb5984bec7c303ac265b8e5 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Wed, 18 Jul 2012 19:10:54 +0200 Subject: [PATCH] perf tools: Fix trace events storms due to weight demux Trace events have a period (weight) of 1 by default. This can be overriden on events definition by using the __perf_count() macro. For example, the sched_stat_runtime() is weighted with the runtime of the task that fired the event. By default, perf handles such weighted event by dividing it into individual events carrying a weight of 1. For example if sched_stat_runtime is fired and the task has run 5000000 nsecs, perf divides it into 5000000 events in the buffer. This behaviour makes weighted events unusable because they quickly fullfill the buffers and we lose most events. The commit 5d81e5cfb37a174e8ddc0413e2e70cdf05807ace ("events: Don't divide events if it has field period") solves this problem by sending only one event when PERF_SAMPLE_PERIOD flag is set. The weight is carried in the sample itself such that we don't need to demultiplex it anymore. This patch provides the last missing piece to use this feature by setting PERF_SAMPLE_PERIOD from perf tools when we deal with trace events. Before: $ ./perf record -e sched:* -a sleep 1 [ perf record: Woken up 3 times to write data ] [ perf record: Captured and wrote 1.619 MB perf.data (~70749 samples) ] Warning: Processed 16909 events and lost 1 chunks! Check IO/CPU overload! $ ./perf script perf 1894 [003] 824.898327: sched_migrate_task: comm=perf pid=1898 prio=120 orig_cpu=2 dest_cpu=0 perf 1894 [003] 824.898335: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898336: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898337: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898338: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898339: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898340: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] perf 1894 [003] 824.898341: sched_stat_sleep: comm=perf pid=1898 delay=113179500 [ns] [...] After: $ ./perf record -e sched:* -a sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.074 MB perf.data (~3228 samples) ] $ ./perf script perf 1461 [000] 554.286957: sched_migrate_task: comm=perf pid=1465 prio=120 orig_cpu=3 dest_cpu=1 perf 1461 [000] 554.286964: sched_stat_sleep: comm=perf pid=1465 delay=133047190 [ns] perf 1461 [000] 554.286967: sched_wakeup: comm=perf pid=1465 prio=120 success=1 target_cpu=001 swapper 0 [001] 554.286976: sched_stat_wait: comm=perf pid=1465 delay=0 [ns] swapper 0 [001] 554.286983: sched_switch: prev_comm=swapper/1 prev_pid=0 prev_prio=120 prev_state=R ==> next_comm=perf [...] Signed-off-by: Frederic Weisbecker Cc: David Ahern Cc: Ingo Molnar Cc: Jiri Olsa Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1342631456-7233-1-git-send-email-fweisbec@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evlist.c | 2 +- tools/perf/util/parse-events.c | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index f74e9560350e..3edfd3483816 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -214,7 +214,7 @@ int perf_evlist__add_tracepoints(struct perf_evlist *evlist, attrs[i].type = PERF_TYPE_TRACEPOINT; attrs[i].config = err; attrs[i].sample_type = (PERF_SAMPLE_RAW | PERF_SAMPLE_TIME | - PERF_SAMPLE_CPU); + PERF_SAMPLE_CPU | PERF_SAMPLE_PERIOD); attrs[i].sample_period = 1; } diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c index 1aa721d7c10f..a729945838f5 100644 --- a/tools/perf/util/parse-events.c +++ b/tools/perf/util/parse-events.c @@ -377,6 +377,7 @@ static int add_tracepoint(struct list_head **list, int *idx, attr.sample_type |= PERF_SAMPLE_RAW; attr.sample_type |= PERF_SAMPLE_TIME; attr.sample_type |= PERF_SAMPLE_CPU; + attr.sample_type |= PERF_SAMPLE_PERIOD; attr.sample_period = 1; snprintf(name, MAX_NAME_LEN, "%s:%s", sys_name, evt_name); -- GitLab