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| author | Dapeng Mi <dapeng1.mi@linux.intel.com> | 2025-03-07 05:39:03 +0300 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-03-12 05:00:50 +0300 |
| commit | b74683b3bb224eccb644cf260753dfc82e802d92 (patch) | |
| tree | 8c3c067fcb763d9a9c8053b09396f2e360843ea2 | |
| parent | fd5de637a4e9a4cfe987962f0a74f8ed84fca78e (diff) | |
| download | linux-b74683b3bb224eccb644cf260753dfc82e802d92.tar.xz | |
perf x86/topdown: Fix topdown leader sampling test error on hybrid
When running topdown leader smapling test on Intel hybrid platforms,
such as LNL/ARL, we see the below error.
Topdown leader sampling test
Topdown leader sampling [Failed topdown events not reordered correctly]
It indciates the below command fails.
perf record -o "${perfdata}" -e "{instructions,slots,topdown-retiring}:S" true
The root cause is that perf tool creats a perf event for each PMU type
if it can create.
As for this command, there would be 5 perf events created,
cpu_atom/instructions/,cpu_atom/topdown_retiring/,
cpu_core/slots/,cpu_core/instructions/,cpu_core/topdown-retiring/
For these 5 events, the 2 cpu_atom events are in a group and the other 3
cpu_core events are in another group.
When arch_topdown_sample_read() traverses all these 5 events, events
cpu_atom/instructions/ and cpu_core/slots/ don't have a same group
leade, and then return false directly and lead to cpu_core/slots/ event
is used to sample and this is not allowed by PMU driver.
It's a overkill to return false directly if "evsel->core.leader !=
leader->core.leader" since there could be multiple groups in the event
list.
Just "continue" instead of "return false" to fix this issue.
Fixes: 1e53e9d1787b ("perf x86/topdown: Correct leader selection with sample_read enabled")
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Tested-by: Thomas Falcon <thomas.falcon@intel.com>
Tested-by: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/r/20250307023906.1135613-2-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
| -rw-r--r-- | tools/perf/arch/x86/util/topdown.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c index f63747d0abdf..d1c654839049 100644 --- a/tools/perf/arch/x86/util/topdown.c +++ b/tools/perf/arch/x86/util/topdown.c @@ -81,7 +81,7 @@ bool arch_topdown_sample_read(struct evsel *leader) */ evlist__for_each_entry(leader->evlist, evsel) { if (evsel->core.leader != leader->core.leader) - return false; + continue; if (evsel != leader && arch_is_topdown_metrics(evsel)) return true; } |