linux-kernel - [PATCH v8 06/10] perf evsel: Assemble offcpu samples

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Message-ID: <20241113002818.3578645-7-howardchu95@gmail.com>
Date: Tue, 12 Nov 2024 16:28:14 -0800
From: Howard Chu <howardchu95@...il.com>
To: acme@...nel.org,
	peterz@...radead.org
Cc: namhyung@...nel.org,
	irogers@...gle.com,
	mingo@...hat.com,
	jolsa@...nel.org,
	adrian.hunter@...el.com,
	kan.liang@...ux.intel.com,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Howard Chu <howardchu95@...il.com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	James Clark <james.clark@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH v8 06/10] perf evsel: Assemble offcpu samples

Use the data in bpf-output samples, to assemble offcpu samples.

Suggested-by: Namhyung Kim <namhyung@...nel.org>
Reviewed-by: Ian Rogers <irogers@...gle.com>
Signed-off-by: Howard Chu <howardchu95@...il.com>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: James Clark <james.clark@...aro.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Kan Liang <kan.liang@...ux.intel.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: https://lore.kernel.org/r/20241108204137.2444151-7-howardchu95@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evsel.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 8d0308f62484..654fb5196ecf 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2792,6 +2792,35 @@ static inline bool evsel__has_branch_counters(const struct evsel *evsel)
 	return false;
 }
 
+static int __set_offcpu_sample(struct perf_sample *data)
+{
+	u64 *array = data->raw_data;
+	u32 max_size = data->raw_size, *p32;
+	const void *endp = (void *)array + max_size;
+
+	if (array == NULL)
+		return -EFAULT;
+
+	OVERFLOW_CHECK_u64(array);
+	p32 = (void *)array++;
+	data->pid = p32[0];
+	data->tid = p32[1];
+
+	OVERFLOW_CHECK_u64(array);
+	data->period = *array++;
+
+	OVERFLOW_CHECK_u64(array);
+	data->callchain = (struct ip_callchain *)array++;
+	OVERFLOW_CHECK(array, data->callchain->nr * sizeof(u64), max_size);
+	data->ip = data->callchain->ips[1];
+	array += data->callchain->nr;
+
+	OVERFLOW_CHECK_u64(array);
+	data->cgroup = *array;
+
+	return 0;
+}
+
 int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 			struct perf_sample *data)
 {
@@ -3143,6 +3172,9 @@ int evsel__parse_sample(struct evsel *evsel, union perf_event *event,
 		array = (void *)array + sz;
 	}
 
+	if (evsel__is_offcpu_event(evsel))
+		return __set_offcpu_sample(data);
+
 	return 0;
 }
 
-- 
2.43.0