diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2015-09-25 16:15:32 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-09-28 21:50:56 +0300 |
| commit | e1791347b5d57d13326cf0114df1a3f3b1c4ca24 (patch) | |
| tree | f408293ffc2917899760f41ad048c42b658ee267 /tools/perf/util/auxtrace.c | |
| parent | 7c422f5572667fef0db38d2046ecce69dcf0afc8 (diff) | |
| download | linux-e1791347b5d57d13326cf0114df1a3f3b1c4ca24.tar.xz | |
perf auxtrace: Fix 'instructions' period of zero
Instruction tracing options (i.e. --itrace) include an option for
sampling instructions at an arbitrary period. e.g.
--itrace=i10us
means make an 'instructions' sample for every 10us of trace.
Currently the logic does not distinguish between a period of
zero and no period being specified at all, so it gets treated
as the default period which is 100000. That doesn't really
make sense.
Fix it so that zero period is accepted and treated as meaning
"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).
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/1443186956-18718-2-git-send-email-adrian.hunter@intel.com
[ Add a few lines describing this in the Documentation/intel-pt.txt file ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/auxtrace.c')
| -rw-r--r-- | tools/perf/util/auxtrace.c | 4 |
1 files changed, 3 insertions, 1 deletions
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; } |