linux-kernel - Re: [PATCH 4/9] perf session: Create kernel maps in the constructor

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Message-ID: <20100129004242.GC2499@ghostprotocols.net>
Date:	Thu, 28 Jan 2010 22:42:42 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 4/9] perf session: Create kernel maps in the constructor

Em Thu, Jan 28, 2010 at 03:59:38PM -0500, Masami Hiramatsu escreveu:
> Arnaldo Carvalho de Melo wrote:
> > Em Thu, Jan 28, 2010 at 11:28:29AM -0500, Masami Hiramatsu escreveu:

> >> Yeah, and if you can separate an interface only for handling symbols
> >> from debug/elf binaries, it will be helpful for me too.

> > It was done on this same series, now you can do as the patch at the end
> > of this message, that will be on my next series, does.
 
> Great! thank you!
<SNIP>
> > you'll get ipv6.ko located and loaded, mod->dso->long_name thus will
> > have the file to use with libdwarf and sym->start will have the
> > unrelocated address, and mod->start will have where ipv6 is loaded in
> > kernel space

> Oh, nice :-) Is that available for the modules which aren't loaded?

No it isn't, what usecase do you see where you would like to look at non
loaded modules? Traversing the /lib/modules passed can be made to just
create DSOs, not maps if we need it. Maps when created using one of these
DSOs would find them on the list.

> And yeah, I'd like to support modules and it will requires some
> enhancement in kprobe-tracer too.

Ok

<SNIP>
> > With the recent modifications done to untie the session and symbol
> > layers, 'perf probe' now can use just the symbols layer.

> Could you remove session.kmap too?
> other parts look good to me.

I'll haven't done that just to keep the patch as small as possible :-)
But will do before submitting.
 
> Thank you,

You're welcome,

- Arnaldo
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