linux-kernel - Re: [PATCH v1] perf record: Reduce memory for recording lost samples event

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Date: Tue, 2 Jan 2024 18:59:03 -0800
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>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf record: Reduce memory for recording lost samples event

On Wed, Dec 6, 2023 at 6:16 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Reduce from PERF_SAMPLE_MAX_SIZE to "sizeof(*lost) +
> session->machines.host.id_hdr_size".
>
> Suggested-by: Namhyung Kim <namhyung@...nel.org>
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Ping.

Thanks,
Ian

> ---
> Suggested in:
> https://lore.kernel.org/lkml/CAM9d7cjpYHN_Q63sW70vTCisdW=-SzjsrryUUJjgtZ3+9jdxfA@mail.gmail.com/
> ---
>  tools/perf/builtin-record.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index eb5a398ddb1d..206110fc2799 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;
> --
> 2.43.0.rc2.451.g8631bc7472-goog
>