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 a89013c44fd5382dd3d00d3a47db93c2f7ed2b02..91e6828c38cc2ef4c6b4d28d842309ce4e475f8d 100644 (file)
--- 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;