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

From: Gaurav Jain
Date: Thu Jan 16 2014 - 15:24:13 EST

On 1/16/14, 9:37 AM, "Arnaldo Carvalho de Melo" <acme@xxxxxxxxxxxxxxxxxx>

>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.



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