Re: [PATCH v2 03/13] perf hist: Add missing puts to hist__account_cycles

[Namhyung Kim]

Hi Ian,

On Wed, Oct 11, 2023 at 11:24 PM Ian Rogers <irogers@xxxxxxxxxx> 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@xxxxxxxxxx>
> ---
>  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
>