linux-kernel - Re: [PATCH v3] perf tools: Add symfs option for off-box analysis using specified tree

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Message-ID: <20101214143551.GD13425@ghostprotocols.net>
Date:	Tue, 14 Dec 2010 12:35:51 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	"David S. Ahern" <daahern@...co.com>
Cc:	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] perf tools: Add symfs option for off-box analysis
 using specified tree

Em Tue, Dec 14, 2010 at 07:27:42AM -0700, David S. Ahern escreveu:
> On 12/14/10 05:52, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Dec 14, 2010 at 10:24:28AM -0200, Arnaldo Carvalho de Melo escreveu:
> I was not aware of realpath. Simple change to symbol__init?

I made symbol__init use realpath to reduce the arg to --symfs.

> > [acme@...a linux]$ find /tmp/bla
> > /tmp/bla
> > /tmp/bla/lib64
> > /tmp/bla/lib64/libc-2.5.so
> > [acme@...a linux]$ perf report -v -g none --stdio --symfs /tmp/bla > /tmp/out
> > Looking at the vmlinux_path (3 entries long)
> > Failed to open [kernel.kallsyms], continuing without symbols
> > dso__synthesize_plt_symbols: problems reading /home/acme/bin/perf PLT info.
> > [acme@...a linux]$ cat /tmp/out

> strace -e trace=open /tmp/build-perf/perf report -v --symfs /tmp/f14-mnt
> -i /tmp/perf-cs.data

> does not show any attempts to open a file not starting with the symfs path.

Probably because all the files you need are in the directories you
passed to --symfs, remove one and it will leak.

Anyway, fixed in my perf/core branch, still not propagated from
master.k.o to git.k.o :-\

- Arnaldo
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