From: Namhyung Kim Date: Wed, 30 Sep 2015 04:34:00 +0000 (+0900) Subject: perf report: Fix a bug on "--call-graph none" option X-Git-Tag: v4.4-rc1~155^2~18^2~6 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=208e7607459477432d3df52c32d4b961a96d4a94;p=profile%2Fcommon%2Fplatform%2Fkernel%2Flinux-artik7.git perf report: Fix a bug on "--call-graph none" option The patch f9db0d0f1b2c ("perf callchain: Allow disabling call graphs per event") added an ability to enable/disable callchain recording per event. But it had a problem when the enablement setting is changed at 'perf report' time using -g/--call-graph option. For example, the following scenario will get a segfault. $ perf record -ag sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.500 MB perf.data (2555 samples) ] $ perf report -g none perf: Segmentation fault -------- backtrace -------- perf[0x53a98a] /usr/lib/libc.so.6(+0x335af)[0x7f4e91df95af] This is because callchain_param.sort() callback was not set but it tried to call the function as it had the PERF_SAMPLE_CALLCHAIN bit. Signed-off-by: Namhyung Kim Tested-by: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Fixes: f9db0d0f1b2c ("perf callchain: Allow disabling call graphs per event") Link: http://lkml.kernel.org/r/1443587640-24242-1-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c index 0cad9e0..c346b33 100644 --- a/tools/perf/util/hist.c +++ b/tools/perf/util/hist.c @@ -1151,7 +1151,7 @@ void hists__output_resort(struct hists *hists, struct ui_progress *prog) struct perf_evsel *evsel = hists_to_evsel(hists); bool use_callchain; - if (evsel && !symbol_conf.show_ref_callgraph) + if (evsel && symbol_conf.use_callchain && !symbol_conf.show_ref_callgraph) use_callchain = evsel->attr.sample_type & PERF_SAMPLE_CALLCHAIN; else use_callchain = symbol_conf.use_callchain;