From 746c5659b636855786adb24f61bcf9a02ef868fe Mon Sep 17 00:00:00 2001 From: David Ahern Date: Sun, 13 May 2012 22:01:28 -0600 Subject: [PATCH] perf evsel: Create events initially disabled -- again 4ad960f changed perf-record to create events disabled by default and enable them once perf initializations are done. This setting was dropped by 9be6c73. Now perf events are once again generated during perf's initialization phase (e.g., generating maps). As an example, perf opens a lot of files at startup. Unpatched: perf record -e syscalls:sys_enter_open -ga -fo /tmp/perf.data -- sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.087 MB /tmp/perf.data (~3798 samples) ] Using perf-script to look at the samples shows the perf command generating 563 of the 566 total events. Patched: perf record -e syscalls:sys_enter_open -ga -fo /tmp/perf.data -- sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.028 MB /tmp/perf.data (~1206 samples) ] Using perf-script to look at the samples does not show perf command. Signed-off-by: David Ahern Link: http://lkml.kernel.org/r/1336968088-11531-1-git-send-email-dsahern@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/evsel.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index d7a2b4b9801d8..f4f427ce4d641 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -70,6 +70,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts, struct perf_event_attr *attr = &evsel->attr; int track = !evsel->idx; /* only the first counter needs these */ + attr->disabled = 1; attr->sample_id_all = opts->sample_id_all_missing ? 0 : 1; attr->inherit = !opts->no_inherit; attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | @@ -138,7 +139,6 @@ void perf_evsel__config(struct perf_evsel *evsel, struct perf_record_opts *opts, if (perf_target__none(&opts->target) && (!opts->group || evsel == first)) { - attr->disabled = 1; attr->enable_on_exec = 1; } } -- 2.39.5