linux-kernel - Re: [tip:perf/urgent] perf symbols: Allow lookups by symbol name too

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Message-ID: <20091215022020.GD21796@ghostprotocols.net>
Date:	Tue, 15 Dec 2009 00:20:20 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, paulus@...ba.org,
	linux-kernel@...r.kernel.org, a.p.zijlstra@...llo.nl,
	efault@....de, tglx@...utronix.de, mhiramat@...hat.com,
	mingo@...e.hu, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perf/urgent] perf symbols: Allow lookups by symbol name
	too

Em Tue, Dec 15, 2009 at 03:12:03AM +0100, Frederic Weisbecker escreveu:
> On Sat, Dec 12, 2009 at 07:22:03AM +0000, tip-bot for Arnaldo Carvalho de Melo wrote:
> > Looking over the vmlinux/kallsyms is common enough that I'll add a
> > variable to the upcoming struct perf_session to avoid the need to
> > use map_groups__find_by_name to get the main vmlinux/kallsyms map.
> > 
> > The above example looks on the 'variable' symtab, but it is just
> > like that for the functions one.
> > 
> > Also the sort operation is done when we first use
> > map__find_symbol_by_name, in a lazy way.
> 
> It would be nice to also have a kernel symbol resolution
> helper independant of any session.
> 
> The problem is that I need to resolve a kernel variable symbol
> very early, when we parse record options. We don't have any
> session at this time so I can't retrieve the kmaps.

Humm, I don't think that is a problem, we just have to create the
session before processing the args, after all at record time we can use
kallsyms already.

> I'm not sure what's the proper way to handle that.

What is the problem? I'm not following :-)

- Arnaldo
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