[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20231102175735.2272696-11-irogers@google.com>
Date: Thu, 2 Nov 2023 10:56:52 -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>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Nick Terrell <terrelln@...com>,
Kan Liang <kan.liang@...ux.intel.com>,
Andi Kleen <ak@...ux.intel.com>,
Kajol Jain <kjain@...ux.ibm.com>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
Huacai Chen <chenhuacai@...nel.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Vincent Whitchurch <vincent.whitchurch@...s.com>,
"Steinar H. Gunderson" <sesse@...gle.com>,
Liam Howlett <liam.howlett@...cle.com>,
Miguel Ojeda <ojeda@...nel.org>,
Colin Ian King <colin.i.king@...il.com>,
Dmitrii Dolgov <9erthalion6@...il.com>,
Yang Jihong <yangjihong1@...wei.com>,
Ming Wang <wangming01@...ngson.cn>,
James Clark <james.clark@....com>,
K Prateek Nayak <kprateek.nayak@....com>,
Sean Christopherson <seanjc@...gle.com>,
Leo Yan <leo.yan@...aro.org>,
Ravi Bangoria <ravi.bangoria@....com>,
German Gomez <german.gomez@....com>,
Changbin Du <changbin.du@...wei.com>,
Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
Sandipan Das <sandipan.das@....com>,
liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org
Subject: [PATCH v4 10/53] perf record: Be lazier in allocating lost samples buffer
Wait until a lost sample occurs to allocate the lost samples buffer,
often the buffer isn't necessary. This saves a 64kb allocation and
5.3kb of peak memory consumption.
Signed-off-by: Ian Rogers <irogers@...gle.com>
---
tools/perf/builtin-record.c | 29 +++++++++++++++++++----------
1 file changed, 19 insertions(+), 10 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 9b4f3805ca92..b6c8c1371b39 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1924,21 +1924,13 @@ static void __record__save_lost_samples(struct record *rec, struct evsel *evsel,
static void record__read_lost_samples(struct record *rec)
{
struct perf_session *session = rec->session;
- struct perf_record_lost_samples *lost;
+ struct perf_record_lost_samples *lost = NULL;
struct evsel *evsel;
/* there was an error during record__open */
if (session->evlist == NULL)
return;
- lost = zalloc(PERF_SAMPLE_MAX_SIZE);
- if (lost == NULL) {
- pr_debug("Memory allocation failed\n");
- return;
- }
-
- lost->header.type = PERF_RECORD_LOST_SAMPLES;
-
evlist__for_each_entry(session->evlist, evsel) {
struct xyarray *xy = evsel->core.sample_id;
u64 lost_count;
@@ -1961,6 +1953,14 @@ static void record__read_lost_samples(struct record *rec)
}
if (count.lost) {
+ if (!lost) {
+ lost = zalloc(PERF_SAMPLE_MAX_SIZE);
+ if (!lost) {
+ pr_debug("Memory allocation failed\n");
+ return;
+ }
+ lost->header.type = PERF_RECORD_LOST_SAMPLES;
+ }
__record__save_lost_samples(rec, evsel, lost,
x, y, count.lost, 0);
}
@@ -1968,9 +1968,18 @@ static void record__read_lost_samples(struct record *rec)
}
lost_count = perf_bpf_filter__lost_count(evsel);
- if (lost_count)
+ if (lost_count) {
+ if (!lost) {
+ lost = zalloc(PERF_SAMPLE_MAX_SIZE);
+ if (!lost) {
+ pr_debug("Memory allocation failed\n");
+ return;
+ }
+ lost->header.type = PERF_RECORD_LOST_SAMPLES;
+ }
__record__save_lost_samples(rec, evsel, lost, 0, 0, lost_count,
PERF_RECORD_MISC_LOST_SAMPLES_BPF);
+ }
}
out:
free(lost);
--
2.42.0.869.gea05f2083d-goog
Powered by blists - more mailing lists