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Message-Id: <20231014074159.1667880-2-leo.yan@linaro.org>
Date: Sat, 14 Oct 2023 15:41:58 +0800
From: Leo Yan <leo.yan@...aro.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
James Clark <james.clark@....com>,
Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>
Cc: John Garry <john.g.garry@...cle.com>,
Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v1 RESEND 1/2] perf cs-etm: Validate timestamp tracing in per-thread mode
So far, it's impossible to validate timestamp trace in Arm CoreSight when
the perf is in the per-thread mode. E.g. for the command:
perf record -e cs_etm/timestamp/ --per-thread -- ls
The command enables config 'timestamp' for 'cs_etm' event in the
per-thread mode. In this case, the function cs_etm_validate_config()
directly bails out and skips validation.
Given profiled process can be scheduled on any CPUs in the per-thread
mode, this patch validates timestamp tracing for all CPUs when detect
the CPU map is empty.
Signed-off-by: Leo Yan <leo.yan@...aro.org>
Reviewed-by: James Clark <james.clark@....com>
---
tools/perf/arch/arm/util/cs-etm.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index b8d6a953fd74..cf9ef9ba800b 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -205,8 +205,17 @@ static int cs_etm_validate_config(struct auxtrace_record *itr,
for (i = 0; i < cpu__max_cpu().cpu; i++) {
struct perf_cpu cpu = { .cpu = i, };
- if (!perf_cpu_map__has(event_cpus, cpu) ||
- !perf_cpu_map__has(online_cpus, cpu))
+ /*
+ * In per-cpu case, do the validation for CPUs to work with.
+ * In per-thread case, the CPU map is empty. Since the traced
+ * program can run on any CPUs in this case, thus don't skip
+ * validation.
+ */
+ if (!perf_cpu_map__empty(event_cpus) &&
+ !perf_cpu_map__has(event_cpus, cpu))
+ continue;
+
+ if (!perf_cpu_map__has(online_cpus, cpu))
continue;
err = cs_etm_validate_context_id(itr, evsel, i);
--
2.34.1
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