linux-kernel - [PATCH v2 11/13] perf python: Correct pyrf_evsel_

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Message-ID: <20250710235126.1086011-12-irogers@google.com>
Date: Thu, 10 Jul 2025 16:51:24 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Xu Yang <xu.yang_2@....com>, Howard Chu <howardchu95@...il.com>, 
	"Dr. David Alan Gilbert" <linux@...blig.org>, Levi Yun <yeoreum.yun@....com>, Andi Kleen <ak@...ux.intel.com>, 
	Thomas Richter <tmricht@...ux.ibm.com>, Weilin Wang <weilin.wang@...el.com>, 
	Tiezhu Yang <yangtiezhu@...ngson.cn>, Gautam Menghani <gautam@...ux.ibm.com>, 
	Thomas Falcon <thomas.falcon@...el.com>, Chun-Tse Shao <ctshao@...gle.com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 11/13] perf python: Correct pyrf_evsel__read for tool PMUs

Tool PMUs assume that stat's process_counter_values is being used to
read the counters. Specifically they hold onto old values in
evsel->prev_raw_counts and give the cumulative count based off of this
value. Update pyrf_evsel__read to allocate counts and prev_raw_counts,
use evsel__read_counter rather than perf_evsel__read so tool PMUs are
read from not just perf_event_open events, make the returned
pyrf_counts_values contain the delta value rather than the cumulative
value.

Fixes: 739621f65702 ("perf python: Add evsel read method")
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/util/python.c | 47 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 44 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 4a3c2b4dd79f..f689560192f4 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -10,6 +10,7 @@
 #endif
 #include <perf/mmap.h>
 #include "callchain.h"
+#include "counts.h"
 #include "evlist.h"
 #include "evsel.h"
 #include "event.h"
@@ -889,12 +890,38 @@ static PyObject *pyrf_evsel__threads(struct pyrf_evsel *pevsel)
 	return (PyObject *)pthread_map;
 }
 
+/*
+ * Ensure evsel's counts and prev_raw_counts are allocated, the latter
+ * used by tool PMUs to compute the cumulative count as expected by
+ * stat's process_counter_values.
+ */
+static int evsel__ensure_counts(struct evsel *evsel)
+{
+	int nthreads, ncpus;
+
+	if (evsel->counts != NULL)
+		return 0;
+
+	nthreads = perf_thread_map__nr(evsel->core.threads);
+	ncpus = perf_cpu_map__nr(evsel->core.cpus);
+
+	evsel->counts = perf_counts__new(ncpus, nthreads);
+	if (evsel->counts == NULL)
+		return -ENOMEM;
+
+	evsel->prev_raw_counts = perf_counts__new(ncpus, nthreads);
+	if (evsel->prev_raw_counts == NULL)
+		return -ENOMEM;
+
+	return 0;
+}
+
 static PyObject *pyrf_evsel__read(struct pyrf_evsel *pevsel,
 				  PyObject *args, PyObject *kwargs)
 {
 	struct evsel *evsel = &pevsel->evsel;
 	int cpu = 0, cpu_idx, thread = 0, thread_idx;
-	struct perf_counts_values counts;
+	struct perf_counts_values *old_count, *new_count;
 	struct pyrf_counts_values *count_values = PyObject_New(struct pyrf_counts_values,
 							       &pyrf_counts_values__type);
 
@@ -915,8 +942,22 @@ static PyObject *pyrf_evsel__read(struct pyrf_evsel *pevsel,
 			     thread);
 		return NULL;
 	}
-	perf_evsel__read(&(evsel->core), cpu_idx, thread_idx, &counts);
-	count_values->values = counts;
+
+	if (evsel__ensure_counts(evsel))
+		return PyErr_NoMemory();
+
+	/* Set up pointers to the old and newly read counter values. */
+	old_count = perf_counts(evsel->prev_raw_counts, cpu_idx, thread_idx);
+	new_count = perf_counts(evsel->counts, cpu_idx, thread_idx);
+	/* Update the value in evsel->counts. */
+	evsel__read_counter(evsel, cpu_idx, thread_idx);
+	/* Copy the value and turn it into the delta from old_count. */
+	count_values->values = *new_count;
+	count_values->values.val -= old_count->val;
+	count_values->values.ena -= old_count->ena;
+	count_values->values.run -= old_count->run;
+	/* Save the new count over the old_count for the next read. */
+	*old_count = *new_count;
 	return (PyObject *)count_values;
 }
 
-- 
2.50.0.727.gbf7dc18ff4-goog