diff options
| author | Robert Richter <[email protected]> | 2012-04-05 18:26:28 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <[email protected]> | 2012-04-11 17:39:19 -0300 |
| commit | 5a7ed29c7572d00a75e8c4529e30c5ac2ef82271 (patch) | |
| tree | ece2e7d0e2c19ea5a3d0ec172ad0b81a8a19021d | |
| parent | 61d5bf5b01a0baf0934a4bd3d15bc14e4bbf202c (diff) | |
perf record: Use sw counter only if hw pmu is not detected
Use cpu-clock-tick sw counter for cpu-cycles only if there is no hw
pmu available. This is the case if the syscall reports ENOENT. In
other cases (e.g. invalid attributes) we don't want the sw counter to
be used.
Cc: Ingo Molnar <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Robert Richter <[email protected]>
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
| -rw-r--r-- | tools/perf/builtin-record.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index be4e1eee782e..10b1f1f25ed7 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -245,7 +245,7 @@ try_again: * based cpu-clock-tick sw counter, which * is always available even if no PMU support: */ - if (attr->type == PERF_TYPE_HARDWARE + if (err == ENOENT && attr->type == PERF_TYPE_HARDWARE && attr->config == PERF_COUNT_HW_CPU_CYCLES) { if (verbose) |