diff options
| -rw-r--r-- | tools/perf/Documentation/intel-pt.txt | 5 | ||||
| -rw-r--r-- | tools/perf/util/auxtrace.c | 4 | ||||
| -rw-r--r-- | tools/perf/util/intel-pt.c | 2 |
3 files changed, 9 insertions, 2 deletions
diff --git a/tools/perf/Documentation/intel-pt.txt b/tools/perf/Documentation/intel-pt.txt index c94c9de3173e..886612b50961 100644 --- a/tools/perf/Documentation/intel-pt.txt +++ b/tools/perf/Documentation/intel-pt.txt @@ -707,6 +707,11 @@ on the sample is *not* adjusted and reflects the last known value of TSC. For Intel PT, the default period is 100us. +Setting it to a zero period means "as often as possible". + +In the case of Intel PT that is the same as a period of 1 and a unit of +'instructions' (i.e. --itrace=i1i). + Also the call chain size (default 16, max. 1024) for instructions or transactions events can be specified. e.g. diff --git a/tools/perf/util/auxtrace.c b/tools/perf/util/auxtrace.c index a980e7c50ee0..c4993b2e6c50 100644 --- a/tools/perf/util/auxtrace.c +++ b/tools/perf/util/auxtrace.c @@ -950,6 +950,7 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str, const char *p; char *endptr; bool period_type_set = false; + bool period_set = false; synth_opts->set = true; @@ -971,6 +972,7 @@ int itrace_parse_synth_opts(const struct option *opt, const char *str, p += 1; if (isdigit(*p)) { synth_opts->period = strtoull(p, &endptr, 10); + period_set = true; p = endptr; while (*p == ' ' || *p == ',') p += 1; @@ -1053,7 +1055,7 @@ out: if (!period_type_set) synth_opts->period_type = PERF_ITRACE_DEFAULT_PERIOD_TYPE; - if (!synth_opts->period) + if (!period_set) synth_opts->period = PERF_ITRACE_DEFAULT_PERIOD; } diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index 38942e1eac8f..c8bb5ca6a157 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -720,7 +720,7 @@ static struct intel_pt_queue *intel_pt_alloc_queue(struct intel_pt *pt, if (!params.period) { params.period_type = INTEL_PT_PERIOD_INSTRUCTIONS; - params.period = 1000; + params.period = 1; } } |