linux-kernel - Re: [PATCH perf/core 18/22] perf stat: Fix cmd_stat to release cpu

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Date:	Wed, 9 Dec 2015 12:05:43 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH perf/core 18/22] perf stat: Fix cmd_stat to release
 cpu_map

Em Wed, Dec 09, 2015 at 11:11:27AM +0900, Masami Hiramatsu escreveu:
> Fix cmd_stat() to release cpu_map objects (aggr_map and
> cpus_aggr_map) afterwards.
> 
> refcnt debugger shows that the cmd_stat initializes cpu_map
> but not puts it.
>   ----
>   # ./perf stat -v ls
>   ....
>   REFCNT: BUG: Unreclaimed objects found.
>   ==== [0] ====
>   Unreclaimed cpu_map@...9339c0
>   Refcount +1 => 1 at
>     ./perf(cpu_map__empty_new+0x6d) [0x4e64bd]
>     ./perf(cmd_stat+0x5fe) [0x43594e]
>     ./perf() [0x47b785]
>     ./perf(main+0x617) [0x422587]
>     /lib64/libc.so.6(__libc_start_main+0xf5) [0x7f2dff420af5]
>     ./perf() [0x4226fd]
>   REFCNT: Total 1 objects are not reclaimed.
>     "cpu_map" leaks 1 objects
>   ----
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
>  tools/perf/builtin-stat.c |   11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index e74712d..eb6da8f 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1094,6 +1094,16 @@ static int perf_stat_init_aggr_mode(void)
>  	return cpus_aggr_map ? 0 : -ENOMEM;
>  }
>  
> +static void perf_stat_exit_aggr_mode(void)
> +{
> +	if (aggr_map)
> +		cpu_map__put(aggr_map);
> +	if (cpus_aggr_map)
> +		cpu_map__put(cpus_aggr_map);

No need to check if it is NULL, as the other __put operations,
cpu_map__put() checks it:


void cpu_map__put(struct cpu_map *map)
{
	if (map && atomic_dec_and_test(&map->refcnt))
		cpu_map__delete(map);
}

I'm removing those checks and applying this patch, thanks!

> +	aggr_map = NULL;
> +	cpus_aggr_map = NULL;
> +}
> +
>  /*
>   * Add default attributes, if there were no attributes specified or
>   * if -d/--detailed, -d -d or -d -d -d is used:
> @@ -1442,6 +1452,7 @@ int cmd_stat(int argc, const char **argv, const char *prefix __maybe_unused)
>  	if (!forever && status != -1 && !interval)
>  		print_counters(NULL, argc, argv);
>  
> +	perf_stat_exit_aggr_mode();
>  	perf_evlist__free_stats(evsel_list);
>  out:
>  	perf_evlist__delete(evsel_list);
--
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