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Message-ID: <d93a2a3e-25dd-a67f-be01-409970241295@intel.com> Date: Tue, 4 Oct 2022 08:20:58 +0300 From: Adrian Hunter <adrian.hunter@...el.com> To: Namhyung Kim <namhyung@...nel.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Jiri Olsa <jolsa@...nel.org> Cc: Ingo Molnar <mingo@...nel.org>, Peter Zijlstra <peterz@...radead.org>, LKML <linux-kernel@...r.kernel.org>, Ian Rogers <irogers@...gle.com>, linux-perf-users@...r.kernel.org, Kan Liang <kan.liang@...ux.intel.com>, Leo Yan <leo.yan@...aro.org> Subject: Re: [PATCH 2/5] libperf: Propagate maps only if necessary On 30/09/22 20:27, Namhyung Kim wrote: > The current code propagate evsel's cpu map settings to evlist when it's > added to an evlist. But the evlist->all_cpus and each evsel's cpus will > be updated in perf_evlist__set_maps() later. No need to do it before > evlist's cpus are set actually. > > In fact it discards this intermediate all_cpus maps at the beginning > of perf_evlist__set_maps(). Let's not do this. It's only needed when > an evsel is added after the evlist cpu/thread maps are set. > > Signed-off-by: Namhyung Kim <namhyung@...nel.org> Reviewed-by: Adrian Hunter <adrian.hunter@...el.com> > --- > tools/lib/perf/evlist.c | 8 ++++---- > tools/lib/perf/include/internal/evlist.h | 1 + > 2 files changed, 5 insertions(+), 4 deletions(-) > > diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c > index 187129652ab6..c5f65b89d77a 100644 > --- a/tools/lib/perf/evlist.c > +++ b/tools/lib/perf/evlist.c > @@ -67,9 +67,7 @@ static void perf_evlist__propagate_maps(struct perf_evlist *evlist) > { > struct perf_evsel *evsel; > > - /* Recomputing all_cpus, so start with a blank slate. */ > - perf_cpu_map__put(evlist->all_cpus); > - evlist->all_cpus = NULL; > + evlist->needs_map_propagation = true; > > perf_evlist__for_each_evsel(evlist, evsel) > __perf_evlist__propagate_maps(evlist, evsel); > @@ -81,7 +79,9 @@ void perf_evlist__add(struct perf_evlist *evlist, > evsel->idx = evlist->nr_entries; > list_add_tail(&evsel->node, &evlist->entries); > evlist->nr_entries += 1; > - __perf_evlist__propagate_maps(evlist, evsel); > + > + if (evlist->needs_map_propagation) > + __perf_evlist__propagate_maps(evlist, evsel); > } > > void perf_evlist__remove(struct perf_evlist *evlist, > diff --git a/tools/lib/perf/include/internal/evlist.h b/tools/lib/perf/include/internal/evlist.h > index 6f89aec3e608..850f07070036 100644 > --- a/tools/lib/perf/include/internal/evlist.h > +++ b/tools/lib/perf/include/internal/evlist.h > @@ -19,6 +19,7 @@ struct perf_evlist { > int nr_entries; > int nr_groups; > bool has_user_cpus; > + bool needs_map_propagation; > /** > * The cpus passed from the command line or all online CPUs by > * default.
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