From: Ian Rogers irogers@google.com
[ Upstream commit bc355822f0d9623b632069105d425c822d124cc8 ]
If slots isn't with a topdown event then moving it is unnecessary. For example {instructions, slots} is re-ordered:
$ perf stat -e '{instructions,slots}' -a sleep 1
Performance counter stats for 'system wide':
936,600,825 slots 144,440,968 instructions
1.006061423 seconds time elapsed
Which can break tools expecting the command line order to match the printed order. It is necessary to move the slots event first when it appears with topdown events. Add extra checking so that the slots event is only moved in the case of there being a topdown event like:
$ perf stat -e '{instructions,slots,topdown-fe-bound}' -a sleep 1
Performance counter stats for 'system wide':
2427568570 slots 300927614 instructions 551021649 topdown-fe-bound
1.001771803 seconds time elapsed
Fixes: 94dbfd6781a0e87b ("perf parse-events: Architecture specific leader override") Reported-by: Kan Liang kan.liang@linux.intel.com Signed-off-by: Ian Rogers irogers@google.com Tested-by: Kan Liang kan.liang@linux.intel.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Alexandre Torgue alexandre.torgue@foss.st.com Cc: Andi Kleen ak@linux.intel.com Cc: Ingo Molnar mingo@redhat.com Cc: James Clark james.clark@arm.com Cc: Jiri Olsa jolsa@kernel.org Cc: John Garry john.garry@huawei.com Cc: Mark Rutland mark.rutland@arm.com Cc: Maxime Coquelin mcoquelin.stm32@gmail.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Stephane Eranian eranian@google.com Cc: Xing Zhengjun zhengjun.xing@linux.intel.com Link: https://lore.kernel.org/r/20220321223344.1034479-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/arch/x86/util/evlist.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-)
diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c index 8d9b55959256..cfc208d71f00 100644 --- a/tools/perf/arch/x86/util/evlist.c +++ b/tools/perf/arch/x86/util/evlist.c @@ -20,17 +20,27 @@ int arch_evlist__add_default_attrs(struct evlist *evlist)
struct evsel *arch_evlist__leader(struct list_head *list) { - struct evsel *evsel, *first; + struct evsel *evsel, *first, *slots = NULL; + bool has_topdown = false;
first = list_first_entry(list, struct evsel, core.node);
if (!pmu_have_event("cpu", "slots")) return first;
+ /* If there is a slots event and a topdown event then the slots event comes first. */ __evlist__for_each_entry(list, evsel) { - if (evsel->pmu_name && !strcmp(evsel->pmu_name, "cpu") && - evsel->name && strcasestr(evsel->name, "slots")) - return evsel; + if (evsel->pmu_name && !strcmp(evsel->pmu_name, "cpu") && evsel->name) { + if (strcasestr(evsel->name, "slots")) { + slots = evsel; + if (slots == first) + return first; + } + if (!strncasecmp(evsel->name, "topdown", 7)) + has_topdown = true; + if (slots && has_topdown) + return slots; + } } return first; }