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Message-ID: <20240521133029.83654-3-ben.gainey@arm.com>
Date: Tue, 21 May 2024 14:30:27 +0100
From: Ben Gainey <ben.gainey@....com>
To: peterz@...radead.org,
mingo@...hat.com,
acme@...nel.org,
namhyung@...nel.org
Cc: james.clark@....com,
mark.rutland@....com,
alexander.shishkin@...ux.intel.com,
jolsa@...nel.org,
irogers@...gle.com,
adrian.hunter@...el.com,
linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org,
Ben Gainey <ben.gainey@....com>
Subject: [PATCH v6 2/4] tools/perf: Track where perf_sample_ids need per-thread periods
perf_sample_ids and related evlist/evsel code are modified to track
which events combine inherit+PERF_SAMPLE_READ+PERF_SAMPLE_TID.
Events with this combination of properties must be handled differently
when calculating each sample period. They must use the combination
of (ID + TID) to uniquely identify each distinct sequence of values.
Signed-off-by: Ben Gainey <ben.gainey@....com>
---
tools/lib/perf/evlist.c | 1 +
tools/lib/perf/evsel.c | 7 +++++++
tools/lib/perf/include/internal/evsel.h | 9 +++++++++
3 files changed, 17 insertions(+)
diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index c6d67fc9e57ef..d17288eeaee48 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -255,6 +255,7 @@ static void perf_evlist__id_hash(struct perf_evlist *evlist,
sid->id = id;
sid->evsel = evsel;
+ sid->period_per_thread = perf_evsel__attr_has_per_thread_sample_period(evsel);
hash = hash_64(sid->id, PERF_EVLIST__HLIST_BITS);
hlist_add_head(&sid->node, &evlist->heads[hash]);
}
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c
index c07160953224a..f7abb879f416e 100644
--- a/tools/lib/perf/evsel.c
+++ b/tools/lib/perf/evsel.c
@@ -537,6 +537,13 @@ void perf_evsel__free_id(struct perf_evsel *evsel)
evsel->ids = 0;
}
+bool perf_evsel__attr_has_per_thread_sample_period(struct perf_evsel *evsel)
+{
+ return (evsel->attr.sample_type & PERF_SAMPLE_READ)
+ && (evsel->attr.sample_type & PERF_SAMPLE_TID)
+ && evsel->attr.inherit;
+}
+
void perf_counts_values__scale(struct perf_counts_values *count,
bool scale, __s8 *pscaled)
{
diff --git a/tools/lib/perf/include/internal/evsel.h b/tools/lib/perf/include/internal/evsel.h
index 5cd220a61962e..f8de2bf89c76b 100644
--- a/tools/lib/perf/include/internal/evsel.h
+++ b/tools/lib/perf/include/internal/evsel.h
@@ -36,6 +36,13 @@ struct perf_sample_id {
/* Holds total ID period value for PERF_SAMPLE_READ processing. */
u64 period;
+
+ /*
+ * When inherit is combined with PERF_SAMPLE_READ, the period value is
+ * per (id, thread) tuple, rather than per id, so use the stream_id to
+ * uniquely identify the period, rather than the id.
+ */
+ bool period_per_thread;
};
struct perf_evsel {
@@ -88,4 +95,6 @@ int perf_evsel__apply_filter(struct perf_evsel *evsel, const char *filter);
int perf_evsel__alloc_id(struct perf_evsel *evsel, int ncpus, int nthreads);
void perf_evsel__free_id(struct perf_evsel *evsel);
+bool perf_evsel__attr_has_per_thread_sample_period(struct perf_evsel *evsel);
+
#endif /* __LIBPERF_INTERNAL_EVSEL_H */
--
2.45.1
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