From: Kan Liang <kan.li...@intel.com> This patchkit adds the ability to turn off time stamps per event.
One usaful case for 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> Cc: Andi Kleen <a...@linux.intel.com> Cc: Namhyung Kim <namhy...@kernel.org> Link: http://lkml.kernel.org/r/1438677022-34296-2-git-send-email-kan.li...@intel.com Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- 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 ac41350ca485..0d852d1bc90f 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 7d3acba5a512..7febfe255703 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 a7d2175358b8..6a129081f3ad 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 09bee93fd0ec..a6cb9afc20e2 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 2063048a4354..e6f9aacc1cce 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 13cef3c65565..f5427505ae77 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 7bcb8c315615..b615cdf211d6 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:")) -- 2.1.0 -- 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/
