On Tue, Aug 04, 2015 at 04:30:19AM -0400, Kan Liang wrote: > From: Kan Liang <kan.li...@intel.com> > > This patchkit adds the ability to turn off time stamps per event. > One usable case of partial time is to work with per-event callgraph to > enable "PEBS threshold > 1" (https://lkml.org/lkml/2015/5/10/196), which > can significantly reduce the sampling overhead. > The event samples with time stamps off will not be ordered. > > Signed-off-by: Kan Liang <kan.li...@intel.com>
Acked-by: Jiri Olsa <jo...@kernel.org> thanks, jirka > --- > tools/perf/Documentation/perf-record.txt | 4 +++- > tools/perf/util/evsel.c | 14 +++++++++++--- > tools/perf/util/evsel.h | 2 ++ > tools/perf/util/parse-events.c | 12 ++++++++++++ > tools/perf/util/parse-events.h | 1 + > tools/perf/util/parse-events.l | 1 + > tools/perf/util/pmu.c | 2 +- > 7 files changed, 31 insertions(+), 5 deletions(-) > > diff --git a/tools/perf/Documentation/perf-record.txt > b/tools/perf/Documentation/perf-record.txt > index ac41350..0d852d1 100644 > --- a/tools/perf/Documentation/perf-record.txt > +++ b/tools/perf/Documentation/perf-record.txt > @@ -49,7 +49,9 @@ OPTIONS > These params can be used to overload default config values per event. > Here is a list of the params. > - 'period': Set event sampling period > - > + - 'time': Disable/enable time stamping. Acceptable values are 1 for > + enabling time stamping. 0 for disabling time stamping. > + The default is 1. > Note: If user explicitly sets options which conflict with the params, > the value set by the params will be overridden. > > diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c > index 7d3acba..7febfe2 100644 > --- a/tools/perf/util/evsel.c > +++ b/tools/perf/util/evsel.c > @@ -587,15 +587,23 @@ perf_evsel__config_callgraph(struct perf_evsel *evsel, > } > } > > -static void apply_config_terms(struct perf_event_attr *attr __maybe_unused, > - struct list_head *config_terms) > +static void apply_config_terms(struct perf_evsel *evsel) > { > struct perf_evsel_config_term *term; > + struct list_head *config_terms = &evsel->config_terms; > + struct perf_event_attr *attr = &evsel->attr; > > list_for_each_entry(term, config_terms, list) { > switch (term->type) { > case PERF_EVSEL__CONFIG_TERM_PERIOD: > attr->sample_period = term->val.period; > + break; > + case PERF_EVSEL__CONFIG_TERM_TIME: > + if (term->val.time) > + perf_evsel__set_sample_bit(evsel, TIME); > + else > + perf_evsel__reset_sample_bit(evsel, TIME); > + break; > default: > break; > } > @@ -798,7 +806,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct > record_opts *opts) > * Apply event specific term settings, > * it overloads any global configuration. > */ > - apply_config_terms(attr, &evsel->config_terms); > + apply_config_terms(evsel); > } > > static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int > nthreads) > diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h > index a7d2175..6a12908 100644 > --- a/tools/perf/util/evsel.h > +++ b/tools/perf/util/evsel.h > @@ -39,6 +39,7 @@ struct cgroup_sel; > */ > enum { > PERF_EVSEL__CONFIG_TERM_PERIOD, > + PERF_EVSEL__CONFIG_TERM_TIME, > PERF_EVSEL__CONFIG_TERM_MAX, > }; > > @@ -47,6 +48,7 @@ struct perf_evsel_config_term { > int type; > union { > u64 period; > + bool time; > } val; > }; > > diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c > index 09bee93..a6cb9af 100644 > --- a/tools/perf/util/parse-events.c > +++ b/tools/perf/util/parse-events.c > @@ -603,6 +603,14 @@ do { > \ > * attr->branch_sample_type = term->val.num; > */ > break; > + case PARSE_EVENTS__TERM_TYPE_TIME: > + CHECK_TYPE_VAL(NUM); > + if (term->val.num > 1) { > + err->str = strdup("expected 0 or 1"); > + err->idx = term->err_val; > + return -EINVAL; > + } > + break; > case PARSE_EVENTS__TERM_TYPE_NAME: > CHECK_TYPE_VAL(STR); > break; > @@ -650,6 +658,10 @@ do { > \ > switch (term->type_term) { > case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD: > ADD_CONFIG_TERM(PERIOD, period, term->val.num); > + break; > + case PARSE_EVENTS__TERM_TYPE_TIME: > + ADD_CONFIG_TERM(TIME, time, term->val.num); > + break; > default: > break; > } > diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h > index 2063048..e6f9aacc 100644 > --- a/tools/perf/util/parse-events.h > +++ b/tools/perf/util/parse-events.h > @@ -63,6 +63,7 @@ enum { > PARSE_EVENTS__TERM_TYPE_NAME, > PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD, > PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE, > + PARSE_EVENTS__TERM_TYPE_TIME, > }; > > struct parse_events_term { > diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l > index 13cef3c..f542750 100644 > --- a/tools/perf/util/parse-events.l > +++ b/tools/perf/util/parse-events.l > @@ -183,6 +183,7 @@ config2 { return term(yyscanner, > PARSE_EVENTS__TERM_TYPE_CONFIG2); } > name { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NAME); > } > period { return term(yyscanner, > PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD); } > branch_type { return term(yyscanner, > PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE); } > +time { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_TIME); > } > , { return ','; } > "/" { BEGIN(INITIAL); return '/'; } > {name_minus} { return str(yyscanner, PE_NAME); } > diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c > index 7bcb8c3..b615cdf 100644 > --- a/tools/perf/util/pmu.c > +++ b/tools/perf/util/pmu.c > @@ -607,7 +607,7 @@ static char *formats_error_string(struct list_head > *formats) > { > struct perf_pmu_format *format; > char *err, *str; > - static const char *static_terms = > "config,config1,config2,name,period,branch_type\n"; > + static const char *static_terms = > "config,config1,config2,name,period,branch_type,time\n"; > unsigned i = 0; > > if (!asprintf(&str, "valid terms:")) > -- > 1.8.3.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/