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

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Message-ID: <20101214140604.GC13425@ghostprotocols.net>
Date:	Tue, 14 Dec 2010 12:06:04 -0200
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	David 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 10:52:45AM -0200, Arnaldo Carvalho de Melo escreveu:
> Ok, there are still some problems:
> 
> It is escaping the symfs jail for /home/acme/bin/perf, /lib64/libpthread-2.5.so
> and kernel modules, investigating...

Those 'G' signals means DSO__ORIG_GUEST_KMODULE, since you were not
prefixing that case with symfs, it was the jail leak point, fixed, doing
some more testing before merging.

> [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
> Failed to open [kernel.kallsyms], continuing without symbols
> # Events: 503  cycles
> #
> # Overhead Command    Shared Object                                Symbol
> # ........ .......... .....................................        ....................
> #
>    0.84%        perf  /home/acme/bin/perf                  0x26bf1 G [.] die_builtin
>    0.21%        perf  /home/acme/bin/perf                  0x1db4b G [.] event__synthesize_kernel_mmap
>    0.21%        perf  /home/acme/bin/perf                  0x4700  G [.] _init
>    0.21%        perf  /home/acme/bin/perf                  0x1deca G [.] event__synthesize_comm
>    0.21%        perf  /lib64/libpthread-2.5.so             0xd210  G [.] __write_nocancel
>    0.21%        perf  /home/acme/bin/perf                  0xddbd  G [.] atexit_header
>    0.03% kworker/0:1  /lib/modules/2.6.37-rc3/.../ixgbe.ko 0x605   G [k] ixgbe_update_stats
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