linux-kernel - Re: [RFC][PATCH 1/2] perf: Add 'perf kmem' tool

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Message-ID: <20091123143701.GC15547@ghostprotocols.net>
Date:	Mon, 23 Nov 2009 12:37:02 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Li Zefan <lizf@...fujitsu.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Eduard - Gabriel Munteanu <eduard.munteanu@...ux360.ro>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [RFC][PATCH 1/2] perf: Add 'perf kmem' tool

Em Mon, Nov 23, 2009 at 08:22:21AM +0100, Peter Zijlstra escreveu:
> On Mon, 2009-11-23 at 07:51 +0100, Ingo Molnar wrote:
> > I havent tried this - is this really possible to do on an x86 box, with 
> > a typical distro? Can i install say Fedora PowerPC debuginfo packages on 
> > an x86 box, while also having the x86 debuginfo packages there? 
> 
> The best option would be to allow to specify a chroot parameter, where
> we can specify the embedded root filesystem on out machine.

yeah, I'm working now on a vmlinux_path, so that the symbol machinery in
perf looks at /lib/module/`uname -r`/build/vmlinux,
/usr/lib/debug/lib/modules/`uname -r`/vmlinux, ./vmlinux as a default or
in getenv("VMLINUX_PATH") if set. Being able to specify a
SYMTAB_PREFIX_PATH also should be possible.
 
> I'm not even sure embedded distros even have this separate debug package
> crazyness, you simply build the distro with or without debuginfo.

Whatever crazyness people usually do to find the files with matching,
richer symtabs we should support :)

- Arnaldo
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