path: root/tools
diff options
authorArnaldo Carvalho de Melo <acme@redhat.com>2012-05-25 14:49:51 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-05-25 14:59:37 -0300
commit895d97663c83f8ed7a3386e912009155524fe7dd (patch)
treee782ad8cf7b1c460e3756d94c3d873e98add448d /tools
parentperf tools: fix thread_map__new_by_pid_str() memory leak in error path (diff)
perf top: Fix counter name fixup when fallbacking to cpu-clock
In 40491eaa "perf top: Update event name when falling back to cpu-clock" we freed counter->name but didn't reset it to NULL, then when setting it to the result of event_name(), event_name() would use the cached value, which by now was overwritten and thus we got garbage or a zero lenght string. Fix it by just freeing and setting counter->name to NULL, this way event_name() when called afterwards, will find the right counter name and cache it again. Found while trying 'cycles:pp' on a machine were :pp couldn't be honoured. Probably the best fallback here is to tell the user that that level of precision is not available on the PMU and then go removing 'p', levels of precision till we get to play 'cycles' and if even that fails, _then_ get to 'cpu-clock'. But that is the matter for another patch, this one just needs to fix the caching issue, which in the end will show 'cpu-clock' when tools ask for the event name being used, which clarifies things for the user, that will see that 'cycles:pp' or whatever not support event is not being used, some sort of fallback happened. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.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-w1neie2dqli89we1bzwkf4id@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 6031dce0429f..d4a5f9b7f4f9 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -953,7 +953,7 @@ try_again:
attr->config = PERF_COUNT_SW_CPU_CLOCK;
if (counter->name) {
- counter->name = strdup(event_name(counter));
+ counter->name = NULL;
goto try_again;