Re: [PATCH] perf record: Set PERF_RECORD_SAMPLE if attr->freq is set.
From: Athira Rajeev <hidden>
Date: 2020-07-28 03:08:23
Also in:
bpf, lkml
On 27-Jul-2020, at 12:29 PM, Ian Rogers [off-list ref] wrote: From: David Sharp <redacted> evsel__config() would only set PERF_RECORD_SAMPLE if it set attr->freq
Hi Ian, Commit message says PERF_RECORD_SAMPLE. But since we are setting period here, it has to say “PERF_SAMPLE_PERIOD” ? Thanks Athira
quoted hunk ↗ jump to hunk
from perf record options. When it is set by libpfm events, it would not get set. This changes evsel__config to see if attr->freq is set outside of whether or not it changes attr->freq itself. Signed-off-by: David Sharp <redacted> Signed-off-by: Ian Rogers <irogers@google.com> --- tools/perf/util/evsel.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index ef802f6d40c1..811f538f7d77 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c@@ -979,13 +979,18 @@ void evsel__config(struct evsel *evsel, struct record_opts *opts,if (!attr->sample_period || (opts->user_freq != UINT_MAX || opts->user_interval != ULLONG_MAX)) { if (opts->freq) { - evsel__set_sample_bit(evsel, PERIOD); attr->freq = 1; attr->sample_freq = opts->freq; } else { attr->sample_period = opts->default_interval; } } + /* + * If attr->freq was set (here or earlier), ask for period + * to be sampled. + */ + if (attr->freq) + evsel__set_sample_bit(evsel, PERIOD); if (opts->no_samples) attr->sample_freq = 0; -- 2.28.0.rc0.142.g3c755180ce-goog