diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-12-13 21:16:30 +0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-01-24 23:40:08 +0400 |
| commit | c0a54341c0e89333ef201fc3f3001176962f6121 (patch) | |
| tree | d43d2fcb1c49ae17cbf8cf9aa270694b88cf39e1 /tools/perf/util/evsel.c | |
| parent | 594ac61ad3be9c80c738a9fe3bb95c05d8d1bae1 (diff) | |
| download | linux-c0a54341c0e89333ef201fc3f3001176962f6121.tar.xz | |
perf evsel: Introduce event fallback method
The only fallback right now is for HW cpu-cycles -> SW cpu-clock, that
was done in the same way in both 'top' and 'record'.
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-58l1mgibh9oa9m0pd3fasxa5@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.c')
| -rw-r--r-- | tools/perf/util/evsel.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index ee6ee3f45c2a..0c88e5c12dab 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -1378,3 +1378,31 @@ int perf_evsel__fprintf(struct perf_evsel *evsel, fputc('\n', fp); return ++printed; } + +bool perf_evsel__fallback(struct perf_evsel *evsel, int err, + char *msg, size_t msgsize) +{ + if ((err == ENOENT || err == ENXIO) && + evsel->attr.type == PERF_TYPE_HARDWARE && + evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) { + /* + * If it's cycles then fall back to hrtimer based + * cpu-clock-tick sw counter, which is always available even if + * no PMU support. + * + * PPC returns ENXIO until 2.6.37 (behavior changed with commit + * b0a873e). + */ + scnprintf(msg, msgsize, "%s", +"The cycles event is not supported, trying to fall back to cpu-clock-ticks"); + + evsel->attr.type = PERF_TYPE_SOFTWARE; + evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK; + + free(evsel->name); + evsel->name = NULL; + return true; + } + + return false; +} |