linux-kernel - Re: [PATCH v3 3/7 UPDATE] perf tools: Add option for the path of buildid dsos under symfs

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Date:	Wed, 18 May 2016 09:47:10 +0800
From:	Hekuang <hekuang@...wei.com>
To:	David Ahern <dsahern@...il.com>, <peterz@...radead.org>,
	<mingo@...hat.com>, <acme@...nel.org>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
	<wangnan0@...wei.com>, <jpoimboe@...hat.com>, <ak@...ux.intel.com>,
	<eranian@...gle.com>, <namhyung@...nel.org>,
	<adrian.hunter@...el.com>, <sukadev@...ux.vnet.ibm.com>,
	<masami.hiramatsu.pt@...achi.com>, <tumanova@...ux.vnet.ibm.com>,
	<kan.liang@...el.com>, <penberg@...nel.org>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 3/7 UPDATE] perf tools: Add option for the path of
 buildid dsos under symfs



在 2016/5/16 10:50, David Ahern 写道:
> On 5/15/16 7:30 PM, Hekuang wrote:
>> In previous patch, I use 'perf buildid-cache -a' to add vdso
>> binary into the HOST buildid dir.
>
> So 'perf buildid-cache' needs the symfs option?
>
>
With this patch 'PATCH v3 3/7 UPDATE', the tree of symfs dir is
like this:

├── debug($(dso-prefix))
│   ├── .build-id
│   │   ├── 3a
│   │   │   └── e5ba6d4e532ad529e43ccf1ce1ddf8a64a4fdd -> 
../../[kernel.kallsyms]/3ae5ba6d4e532ad529e43ccf1ce1ddf8a64a4fdd
│   │   └── 84
│   │       └── dbd75729adba57cc42f5544b25de571c0c8731 -> 
../../[vdso32]/84dbd75729adba57cc42f5544b25de571c0c8731
│   ├── [kernel.kallsyms]
│   │   └── 3ae5ba6d4e532ad529e43ccf1ce1ddf8a64a4fdd
│   ├── [vdso]
│   │   └── 84dbd75729adba57cc42f5544b25de571c0c8731
│   └── [vdso32]
│       └── 84dbd75729adba57cc42f5544b25de571c0c8731
├── lib
│   ├── ld-2.22.so
│   └── libc-2.22.so
├── tmp
│   └── hello
└── xxx

So all binaries we need are included in the symfs dir. I think
this is consistent with your idea explained in previous mails.

With this symfs, we do not need buildid dir anymore and what's
your idea on 'perf buildid-cache' needs symfs option? after all,
that only effects on buildid dir.

Thanks.