linux-kernel - Re: [PATCH 25/28] perf top: Convert to hist_entry

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Date:	Sat, 11 Jan 2014 17:35:29 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arun Sharma <asharma@...com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rodrigo Campos <rodrigo@...g.com.ar>
Subject: Re: [PATCH 25/28] perf top: Convert to hist_entry_iter

On Wed, Jan 08, 2014 at 05:46:30PM +0900, Namhyung Kim wrote:
> Reuse hist_entry_iter__add() function to share the similar code with
> perf report.  Note that it needs to be called with hists.lock so tweak
> some internal functions not to deadlock or hold the lock too long.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/builtin-top.c | 75 ++++++++++++++++++++++++------------------------
>  1 file changed, 37 insertions(+), 38 deletions(-)
> 
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index f0f55e6030cd..cf330c66bed7 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -186,9 +186,6 @@ static void perf_top__record_precise_ip(struct perf_top *top,
>  	sym = he->ms.sym;
>  	notes = symbol__annotation(sym);
>  
> -	if (pthread_mutex_trylock(&notes->lock))
> -		return;
> -
>  	ip = he->ms.map->map_ip(he->ms.map, ip);
>  	err = hist_entry__inc_addr_samples(he, counter, ip);
>  
> @@ -201,6 +198,8 @@ static void perf_top__record_precise_ip(struct perf_top *top,
>  		       sym->name);
>  		sleep(1);
>  	}
> +
> +	pthread_mutex_lock(&notes->lock);
>  }

locking on function exit.. does not look right ;-)

jirka
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