From: Ian Rogers <irogers@google.com>
Date: Thu, 7 Dec 2023 02:16:27 +0000 (-0800)
Subject: perf record: Reduce memory for recording PERF_RECORD_LOST_SAMPLES event
X-Git-Tag: v6.8-rc1~14^2~14
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d1405c71df21f6c394b8a885aa8a133f749fa22;p=thirdparty%2Flinux.git

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>
---

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index a89013c44fd53..91e6828c38cc2 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -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;