linux-kernel - Re: [PATCH 3/3] perf tools: adjust symbol address

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Date:	Thu, 31 Dec 2009 09:08:44 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] perf tools: adjust symbol address

Em Thu, Dec 31, 2009 at 06:49:01PM +0800, Xiao Guangrong escreveu:
> 
> 
> Arnaldo Carvalho de Melo wrote:
> 
> >> vmlinux* not know it's relocation or not, and we just handle the _specific_
> >> kernel at the time which match the current system. 
> > 
> > 'perf record' in one machine + 'perf report' in another should be
> > possible.
> >  
> 
> Yeah, but current code not support this since it not record kernel build-id in
> perf.data while 'perf record' works, maybe you can fix it.

Huh? Checking...

[root@ana tmp]# perf record -a -f sleep 1s
[ perf record: Woken up 3 times to write data ]
[ perf record: Captured and wrote 0.330 MB perf.data (~14404 samples) ]
[root@ana tmp]# perf buildid-list | grep kallsyms
a3301c8755357466e39d71b46e8f69aecf83c0e8 [kernel.kallsyms]
a3301c8755357466e39d71b46e8f69aecf83c0e8 [kernel.kallsyms]
[root@ana tmp]#

In fact there is a bug, but the bug is either in 'perf buildid-list'
showing it twice or it being recorded twice in 'perf record'.

- Arnaldo
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