linux-kernel - Re: 2.6.25-rc3-mm1 - PROFILE

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Message-ID: <20080305215630.GA15653@one.firstfloor.org>
Date:	Wed, 5 Mar 2008 22:56:31 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Valdis.Kletnieks@...edu
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.25-rc3-mm1 - PROFILE_LIKELY redux..

On Wed, Mar 05, 2008 at 02:59:57PM -0500, Valdis.Kletnieks@...edu wrote:
> On Wed, 05 Mar 2008 18:45:13 +0100, Andi Kleen said:
> > Valdis.Kletnieks@...edu writes:
> > >
> > > So we're in the same 4K as the VDSO64_* values, but some 0x4fe past the
> > > gtod_data.  Anybody got a hint as to what the heck it was doing?
> > 
> > Try this patch:
> > 
> > Remove unlikelies in vsyscall path
> 
> Nope, sorry... same behavior.  Apparently it's a (un)likely someplace
> else...
> 
> I'm trying to figure out what's at 0x9be into the vdso, but not having
> a lot of luck.

You can do objdump -Sr on the vdso/vsyscall object files and see
if there are any external references to unlikely related functions. If yes
the problem is in that function

-Andi
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