linux-kernel - Re: [PATCH v2 03/13] perf hist: Add missing puts to hist__account

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Message-ID: <CAM9d7cg=v9rnPz4cy2yeNZNSCoZ3VReC895gHPTO-emn6XdLXg@mail.gmail.com>
Date:   Wed, 18 Oct 2023 16:16:11 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nick Terrell <terrelln@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Song Liu <song@...nel.org>,
        Sandipan Das <sandipan.das@....com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        James Clark <james.clark@....com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Miguel Ojeda <ojeda@...nel.org>, Leo Yan <leo.yan@...aro.org>,
        German Gomez <german.gomez@....com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Artem Savkov <asavkov@...hat.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH v2 03/13] perf hist: Add missing puts to hist__account_cycles

Hi Ian,

On Wed, Oct 11, 2023 at 11:24 PM Ian Rogers <irogers@...gle.com> wrote:
>
> Caught using reference count checking on perf top with
> "--call-graph=lbr". After this no memory leaks were detected.
>
> Fixes: 57849998e2cd ("perf report: Add processing for cycle histograms")
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/hist.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 3dc8a4968beb..ac8c0ef48a7f 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -2676,8 +2676,6 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
>
>         /* If we have branch cycles always annotate them. */
>         if (bs && bs->nr && entries[0].flags.cycles) {
> -               int i;
> -

Seems not necessary.

>                 bi = sample__resolve_bstack(sample, al);

It looks like this increases the refcount for each bi entry and
it didn't put the refcounts.


>                 if (bi) {
>                         struct addr_map_symbol *prev = NULL;
> @@ -2692,7 +2690,7 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
>                          * Note that perf stores branches reversed from
>                          * program order!
>                          */
> -                       for (i = bs->nr - 1; i >= 0; i--) {
> +                       for (int i = bs->nr - 1; i >= 0; i--) {
>                                 addr_map_symbol__account_cycles(&bi[i].from,
>                                         nonany_branch_mode ? NULL : prev,
>                                         bi[i].flags.cycles);
> @@ -2701,6 +2699,12 @@ void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
>                                 if (total_cycles)
>                                         *total_cycles += bi[i].flags.cycles;
>                         }
> +                       for (unsigned int i = 0; i < bs->nr; i++) {

Can we just reuse the int i above?

Thanks,
Namhyung


> +                               map__put(bi[i].to.ms.map);
> +                               maps__put(bi[i].to.ms.maps);
> +                               map__put(bi[i].from.ms.map);
> +                               maps__put(bi[i].from.ms.maps);
> +                       }
>                         free(bi);
>                 }
>         }
> --
> 2.42.0.609.gbb76f46606-goog
>