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

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Date:	Thu, 16 Jan 2014 20:23:27 +0000
From:	Gaurav Jain <gjain@...com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Namhyung Kim <namhyung@...nel.org>
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>,
	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 1/16/14, 9:37 AM, "Arnaldo Carvalho de Melo" <acme@...stprotocols.net>
wrote:

>Em Thu, Jan 16, 2014 at 10:49:31AM +0900, Namhyung Kim escreveu:
>> 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.
>
>But we do support symbols in data mappings, that is why we have
>MAP__VARIABLE, etc, can you elaborate?

Does perf support data mappings from perf map files? Could you please
share an example of how I may be able to use this.

>Gaurav, do this fixes the problem you reported? Can I have your
>Tested-by: tag?

Yep, I¹ve tested this version of the patch and it works great for me.

Thanks,

Gaurav

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