From fabd37b837f6e80aedba9ad706b517f5eeea9a50 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 29 May 2018 13:59:24 -0300 Subject: perf hists: Check if a hist_entry has callchains before using them So far if we use 'perf record -g' this will make symbol_conf.use_callchain 'true' and logic will assume that all events have callchains enabled, but ever since we added the possibility of setting up callchains for some events (e.g.: -e cycles/call-graph=dwarf/) while not for others, we limit usage scenarios by looking at that symbol_conf.use_callchain global boolean, we better look at each event attributes. On the road to that we need to look if a hist_entry has callchains, that is, to go from hist_entry->hists to the evsel that contains it, to then look at evsel->sample_type for PERF_SAMPLE_CALLCHAIN. The next step is to add a symbol_conf.ignore_callchains global, to use in the places where what we really want to know is if callchains should be ignored, even if present. Then -g will mean just to select a callchain mode to be applied to all events not explicitely setting some other callchain mode, i.e. a default callchain mode, and --no-call-graph will set symbol_conf.ignore_callchains with that clear intention. That too will at some point become a per evsel thing, that tools can set for all or just a few of its evsels. Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Namhyung Kim Cc: Wang Nan Link: https://lkml.kernel.org/n/tip-0sas5cm4dsw2obn75g7ruz69@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/hist.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'tools/perf/util/hist.h') diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h index cafafbf2aa9f..06607c434949 100644 --- a/tools/perf/util/hist.h +++ b/tools/perf/util/hist.h @@ -220,6 +220,12 @@ static inline struct hists *evsel__hists(struct perf_evsel *evsel) return &hevsel->hists; } +static __pure inline bool hists__has_callchains(struct hists *hists) +{ + const struct perf_evsel *evsel = hists_to_evsel(hists); + return evsel__has_callchain(evsel); +} + int hists__init(void); int __hists__init(struct hists *hists, struct perf_hpp_list *hpp_list); -- cgit v1.2.3-59-g8ed1b