linux-kernel - Re: [PATCH] perf tools: Synthesize anon MMAP records on the heap

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Date:	Thu, 16 Jan 2014 10:01:21 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Gaurav Jain <gjain@...com>
Cc:	Don Zickus <dzickus@...hat.com>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arun Sharma <asharma@...com>
Subject: Re: [PATCH] perf tools: Synthesize anon MMAP records on the heap

Hi Gaurav,

On Wed, 15 Jan 2014 06:44:39 +0000, Gaurav Jain wrote:
> Hi Namhyung,
>
>
> On 1/15/14, 12:46 AM, "Namhyung Kim" <namhyung@...nel.org> wrote:
>>Hmm.. so the point is that an executable heap mapping should have
>>/tmp/perf-XXX.map as a file name, right?  If so, does something like
>>below work well for you?
>
> Just gave it a try and it fixed the issue perfectly! Thanks for the help.
> This looks like a much better solution than treating the heap mapping as
> an anon record.

Thanks for testing!  It's good to hear it solved your problem. :)

>
> Gaurav
>
>>diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
>>index 9b9bd719aa19..d52387fe83f1 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)) {

Hmm.. I think it should check type of anon mapping too (assuming JIT
interface only provides function symbols, no?):

		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 (no_dso && type != MAP__FUNCTION)

And it should be simply:

			if (type != MAP__FUNCTION)


>> 				dso__set_loaded(dso, map->type);
>> 		}
>> 	}

I'll update this and send a formal patch soon.  Could you please test it with
the new patch then?

Thanks,
Namhyung
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