linux-kernel - Re: how to use perf annotate on the kernel

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Message-ID: <20100604002039.GC10469@ghostprotocols.net>
Date:	Thu, 3 Jun 2010 21:20:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	paulus@...ba.org, davem@...emloft.net, fweisbec@...il.com,
	perfmon2-devel@...ts.sf.net, eranian@...il.com, tzanussi@...il.com
Subject: Re: how to use perf annotate on the kernel

Em Thu, Jun 03, 2010 at 08:18:04PM +0200, Stephane Eranian escreveu:
> perf annotate __lock_acquire -k /home/eranian/perfmon/official/tip/build/vmlinux
> build id event received for [kernel.kallsyms]:
> 5c110a704293a259fbe11158dc1b25107ad7a23e
> build id event received for
> /lib/modules/2.6.35-rc1-tip/kernel/arch/x86/kernel/cpu/cpufreq/mperf.ko:
> cb5
> build id event received for
> /lib/modules/2.6.35-rc1-tip/kernel/drivers/cpufreq/cpufreq_ondemand.ko:
> cdb5
> Using /home/eranian/perfmon/official/tip/build/vmlinux for symbols
> hist_entry__inc_addr_samples: ip=0xffffffff81073b36
> 0xffffffff81073b30 __lock_acquire: period++ [ip: 0xffffffff81073b36, 0x6] => 1
> hist_entry__inc_addr_samples: ip=0xffffffff81073c94
> 
> But in the end I get:
> objdump: '[kernel.kallsyms]': No such file

Reproduced, working on it now. I've been testing only with vmlinux in
the path it searches for, not by directly specifying it, will get that
fixed, thanks,

- Arnaldo
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