linux-kernel - Re: [PATCH] perf tools: Fix JIT profiling on heap

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Message-ID: <52EB8E03.1030505@iki.fi>
Date:	Fri, 31 Jan 2014 13:50:27 +0200
From:	Pekka Enberg <penberg@....fi>
To:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
CC:	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>, Gaurav Jain <gjain@...com>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] perf tools: Fix JIT profiling on heap

On 01/16/2014 03:49 AM, Namhyung Kim wrote:
> Gaurav reported that perf cannot profile JIT program if it executes
> the code on heap.  This was because current map__new() only handle JIT
> on anon mappings - extends it to handle no_dso (heap, stack) case too.
>
> This patch assumes JIT profiling only provides dynamic function
> symbols so check the mapping type to distinguish the case.  It'd
> provide no symbols for data mapping - if we need to support symbols on
> data mappings later it should be changed.
>
> Reported-by: Gaurav Jain <gjain@...com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Looks OK to me.  Gaurav, does this fix your problem?

> ---
>   tools/perf/util/map.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
> index 9b9bd719aa19..ee1dd687a262 100644
> --- a/tools/perf/util/map.c
> +++ b/tools/perf/util/map.c
> @@ -69,7 +69,7 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
>   		map->ino = ino;
>   		map->ino_generation = ino_gen;
>   
> -		if (anon) {
> +		if ((anon || no_dso) && type == MAP__FUNCTION) {
>   			snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
>   			filename = newfilename;
>   		}
> @@ -93,7 +93,7 @@ struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
>   			 * functions still return NULL, and we avoid the
>   			 * unnecessary map__load warning.
>   			 */
> -			if (no_dso)
> +			if (type != MAP__FUNCTION)
>   				dso__set_loaded(dso, map->type);
>   		}
>   	}

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