linux-kernel - Re: [PATCH 4/4] perf symbols: Capture the running kernel buildid too

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Message-ID: <20091118222911.GF18283@ghostprotocols.net>
Date:	Wed, 18 Nov 2009 20:29:11 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org, Roland McGrath <roland@...hat.com>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 4/4] perf symbols: Capture the running kernel buildid
	too

Em Wed, Nov 18, 2009 at 08:20:53PM -0200, Arnaldo Carvalho de Melo escreveu:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> 
> [root@...pio linux-2.6-tip]# perf record -a -f sleep 3s ; perf
> buildid-list | grep vmlinux
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.171 MB perf.data (~7489 samples) ]
> 18e7cc53db62a7d35e9d6f6c9ddc23017d38ee9a vmlinux
> [root@...pio linux-2.6-tip]#
> 
> Several refactorings were needed so that we can have simmetry between
> dsos__load_modules and dsos__load_kernel, i.e. those functions will
> respectively create and add to the dsos list the loaded modules and
> kernel, with its buildids, but not load its symbols. That is something
> the subcomands that need will have to call dso__load_kernel_sym(), just
> like we do with modules with dsos__load_module_sym()/dso__load_module_sym().

And that can even be deferred to when we get a kernel sample, thinking
about 'perf top --hide_kernel_symbols', this makes a lot of sense 8-)

Tomorrow tho.

- Arnaldo
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