linux-kernel - Re: [RFC] perf report: introduce --map-anon-mem for anon-executable-memory symbols parsing

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Date:	Mon, 22 Jun 2015 23:22:13 +0800
From:	Hou Pengyang <houpengyang@...wei.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	"Wangnan (F)" <wangnan0@...wei.com>, <acme@...nel.org>,
	<mingo@...hat.com>, <namhyung@...nel.org>,
	<a.p.zijlstra@...llo.nl>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] perf report: introduce --map-anon-mem for anon-executable-memory
 symbols parsing

On 2015/6/19 18:42, Ingo Molnar wrote:
>
> * Wangnan (F) <wangnan0@...wei.com> wrote:
>
>> On 2015/6/18 22:01, Hou Pengyang wrote:
>>> This patch introduces a --map-anon-mem argument to perf report to deal
>>> with anon-executable-memory symbol parsing.
>>
>> --map-anon-mem is not a good name. The user defined map area list
>> introduced in this patch can be used on not only anon mapping but
>> also file mapping.
>
> Yeah, so quirky options generally suck and only 0.01% of the users will use it.
> It's in a way worse than not having this code, because we'll have to maintain it,
> but it won't be used.
>
> Is there a way to auto-detect 'executable anon mappings' (perhaps by generating an
> MMAP event with some extra bit set, or a new MMAP event?) so that it's all
> seemless?
>
I think it not difficult to generate such MMAP event, just like :
	
	0 435090424309600 0x3e0 [0x68]: PERF_RECORD_MMAP2 
788/788:[0x7f946c0000(0x4000) @ 0x7f946c0000 00:00 0 0]: ---p //anon

But for symbol parsing, this is not enough. For such mmap area, perf
doesn't know the path of '.so/.o', which is necessarcy for symbol-
parsing. So we need to tell perf the relationship between the .so file 
and the mmap range explicitly.

Thanks,
      Hou

> The user should not be required to know about such details!
>
> Thanks,
>
> 	Ingo
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