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perf tools: Per-event time support
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.liang@intel.com> Acked-by: Jiri Olsa <jolsa@kernel.org> Cc: Andi Kleen <ak@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1438677022-34296-2-git-send-email-kan.liang@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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tools/perf
@ -49,7 +49,9 @@ OPTIONS
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These params can be used to overload default config values per event.
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Here is a list of the params.
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- 'period': Set event sampling period
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- 'time': Disable/enable time stamping. Acceptable values are 1 for
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enabling time stamping. 0 for disabling time stamping.
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The default is 1.
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Note: If user explicitly sets options which conflict with the params,
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the value set by the params will be overridden.
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@ -587,15 +587,23 @@ perf_evsel__config_callgraph(struct perf_evsel *evsel,
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}
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}
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static void apply_config_terms(struct perf_event_attr *attr __maybe_unused,
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struct list_head *config_terms)
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static void apply_config_terms(struct perf_evsel *evsel)
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{
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struct perf_evsel_config_term *term;
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struct list_head *config_terms = &evsel->config_terms;
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struct perf_event_attr *attr = &evsel->attr;
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list_for_each_entry(term, config_terms, list) {
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switch (term->type) {
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case PERF_EVSEL__CONFIG_TERM_PERIOD:
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attr->sample_period = term->val.period;
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break;
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case PERF_EVSEL__CONFIG_TERM_TIME:
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if (term->val.time)
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perf_evsel__set_sample_bit(evsel, TIME);
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else
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perf_evsel__reset_sample_bit(evsel, TIME);
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break;
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default:
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break;
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}
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@ -798,7 +806,7 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
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* Apply event specific term settings,
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* it overloads any global configuration.
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*/
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apply_config_terms(attr, &evsel->config_terms);
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apply_config_terms(evsel);
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}
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static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
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@ -39,6 +39,7 @@ struct cgroup_sel;
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*/
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enum {
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PERF_EVSEL__CONFIG_TERM_PERIOD,
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PERF_EVSEL__CONFIG_TERM_TIME,
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PERF_EVSEL__CONFIG_TERM_MAX,
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};
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@ -47,6 +48,7 @@ struct perf_evsel_config_term {
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int type;
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union {
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u64 period;
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bool time;
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} val;
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};
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@ -603,6 +603,14 @@ do { \
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* attr->branch_sample_type = term->val.num;
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*/
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break;
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case PARSE_EVENTS__TERM_TYPE_TIME:
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CHECK_TYPE_VAL(NUM);
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if (term->val.num > 1) {
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err->str = strdup("expected 0 or 1");
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err->idx = term->err_val;
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return -EINVAL;
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}
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break;
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case PARSE_EVENTS__TERM_TYPE_NAME:
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CHECK_TYPE_VAL(STR);
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break;
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@ -650,6 +658,10 @@ do { \
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switch (term->type_term) {
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case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
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ADD_CONFIG_TERM(PERIOD, period, term->val.num);
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break;
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case PARSE_EVENTS__TERM_TYPE_TIME:
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ADD_CONFIG_TERM(TIME, time, term->val.num);
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break;
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default:
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break;
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}
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@ -63,6 +63,7 @@ enum {
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PARSE_EVENTS__TERM_TYPE_NAME,
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PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD,
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PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE,
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PARSE_EVENTS__TERM_TYPE_TIME,
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};
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struct parse_events_term {
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@ -183,6 +183,7 @@ config2 { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_CONFIG2); }
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name { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_NAME); }
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period { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD); }
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branch_type { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE); }
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time { return term(yyscanner, PARSE_EVENTS__TERM_TYPE_TIME); }
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, { return ','; }
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"/" { BEGIN(INITIAL); return '/'; }
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{name_minus} { return str(yyscanner, PE_NAME); }
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@ -607,7 +607,7 @@ static char *formats_error_string(struct list_head *formats)
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{
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struct perf_pmu_format *format;
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char *err, *str;
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static const char *static_terms = "config,config1,config2,name,period,branch_type\n";
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static const char *static_terms = "config,config1,config2,name,period,branch_type,time\n";
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unsigned i = 0;
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if (!asprintf(&str, "valid terms:"))
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