Commit 7d1405c7 authored Dec 06, 2023 by Ian Rogers Committed by Arnaldo Carvalho de Melo Jan 03, 2024

perf record: Reduce memory for recording PERF_RECORD_LOST_SAMPLES event



Reduce from PERF_SAMPLE_MAX_SIZE to "sizeof(*lost) +
session->machines.host.id_hdr_size".

Suggested-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20231207021627.1322884-1-irogers@google.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 9c51f878

tools/perf/builtin-record.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -1954,7 +1954,8 @@ static void record__read_lost_samples(struct record *rec)

		if (count.lost) {
		if (!lost) {
		lost = zalloc(PERF_SAMPLE_MAX_SIZE);
		lost = zalloc(sizeof(*lost) +
		session->machines.host.id_hdr_size);
		if (!lost) {
		pr_debug("Memory allocation failed\n");
		return;
		@@ -1970,7 +1971,8 @@ static void record__read_lost_samples(struct record *rec)
		lost_count = perf_bpf_filter__lost_count(evsel);
		if (lost_count) {
		if (!lost) {
		lost = zalloc(PERF_SAMPLE_MAX_SIZE);
		lost = zalloc(sizeof(*lost) +
		session->machines.host.id_hdr_size);
		if (!lost) {
		pr_debug("Memory allocation failed\n");
		return;