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Date: Mon, 23 Nov 2009 19:25:25 -0200
From: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: "K.Prasad" <prasad@linux.vnet.ibm.com>, Ingo Molnar <mingo@elte.hu>,
       LKML <linux-kernel@vger.kernel.org>,
       Peter Zijlstra <peterz@infradead.org>,
       Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH 4/4] perf tools: Add support for breakpoint events in
	perf tools
Message-ID: <20091123212525.GE15547@ghostprotocols.net>
References: <1258987355-8751-1-git-send-email-fweisbec@gmail.com> <1258987355-8751-4-git-send-email-fweisbec@gmail.com> <20091123173601.GA7273@in.ibm.com> <20091123202525.GA4979@nowhere> <20091123210939.GD15547@ghostprotocols.net> <20091123211945.GC4979@nowhere>
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Em Mon, Nov 23, 2009 at 10:19:47PM +0100, Frederic Weisbecker escreveu:
> On Mon, Nov 23, 2009 at 07:09:39PM -0200, Arnaldo Carvalho de Melo wrote:
> > Em Mon, Nov 23, 2009 at 09:25:28PM +0100, Frederic Weisbecker escreveu:
> > > I think we should find this symbol length from userspace. I'm not sure
> > > how yet, probably using Dwarf. Arnaldo, do you have an idea about that?
> > 
> > DWARF has the type for each variable or struct member, getting its size
> > is straightforward.
> 
> Ok.
> 
> > Using just /proc/kallsyms all we can do is find the size of a variable
> > by looking at its address and the address of the next one.
> 
> Hmm, but I worry a bit about alignment which would return us
> the wrong size.
> 
> May be can we first try to get the address from /proc/kallsyms,
> and if we have dwarf, get the size from it, otherwise try some
> magic with /proc/kallsysms...

Yeah, I'll get the variables-from-kallsyms bit just after I get a new
mechanism for expressing configuration for the perf symbol resolving
machinery.

Should have this done ASAP.

- Arnaldo
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