linux-kernel - Re: [PATCH 2/2] perf top: Properly notify the user that vmlinux is missing

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Message-ID: <20100315192125.GL6965@ghostprotocols.net>
Date:	Mon, 15 Mar 2010 16:21:26 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	David Miller <davem@...emloft.net>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, fweisbec@...il.com,
	efault@....de, a.p.zijlstra@...llo.nl, paulus@...ba.org
Subject: Re: [PATCH 2/2] perf top: Properly notify the user that vmlinux is
 missing

Em Mon, Mar 15, 2010 at 11:55:26AM -0700, David Miller escreveu:
> From: Arnaldo Carvalho de Melo <acme@...radead.org>
> Date: Mon, 15 Mar 2010 11:46:58 -0300
> > [root@...pio linux-2.6-tip]# perf top -s n_tty_write > /tmp/bla
> > objdump: '[kernel.kallsyms]': No such file
> > 
> > Now this is what the user gets:
> > 
> > [root@...pio linux-2.6-tip]# perf top -s n_tty_write
> > Can't annotate n_tty_write: No vmlinux file was found in the path:
> > [0] vmlinux
> > [1] /boot/vmlinux
> > [2] /boot/vmlinux-2.6.33-rc5
> > [3] /lib/modules/2.6.33-rc5/build/vmlinux
> > [4] /usr/lib/debug/lib/modules/2.6.33-rc5/vmlinux
> > [root@...pio linux-2.6-tip]#
> 
> Arnaldo, if perf top can use the kallsyms to do it's normal task, why
> can't it use that for symbol annotations too?  Isn't there enough
> information available?

Annotation is done by objdump -dS, that requires an executable file to
do ASM annotation, and one with DWARF info for source code annotation.
What we have with /proc/kallsyms is just the symtab.

- Arnaldo
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