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Message-ID: <20090109173914.GD6936@parisc-linux.org>
Date: Fri, 9 Jan 2009 10:39:14 -0700
From: Matthew Wilcox <matthew@....cx>
To: Andi Kleen <andi@...stfloor.org>
Cc: Dirk Hohndel <hohndel@...radead.org>,
"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...e.hu>,
jim owens <jowens@...com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Chris Mason <chris.mason@...cle.com>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
paulmck@...ux.vnet.ibm.com, Gregory Haskins <ghaskins@...ell.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
linux-btrfs <linux-btrfs@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Nick Piggin <npiggin@...e.de>,
Peter Morreale <pmorreale@...ell.com>,
Sven Dietrich <SDietrich@...ell.com>, jh@...e.cz,
richard.guenther@...il.com
Subject: Re: [patch] measurements, numbers about CONFIG_OPTIMIZE_INLINING=y impact
On Fri, Jan 09, 2009 at 06:47:19PM +0100, Andi Kleen wrote:
> On Fri, Jan 09, 2009 at 10:28:01AM -0700, Matthew Wilcox wrote:
> > On Fri, Jan 09, 2009 at 06:20:11PM +0100, Andi Kleen wrote:
> > > Also cc Honza in case he has comments (you might want
> > > to review more of the thread in the archives)
> >
> > I think this particular bug is already known and discussed:
>
> I thought so initially too, but:
>
> >
> > http://gcc.gnu.org/ml/gcc/2008-12/msg00365.html
> >
> > and it hints at being fixed with gcc 4.4. Does anyone want to test
> > that?
>
> Hugh already tested with 4.4 and it didn't work well. At least
> a lot of the low level asm inlines were not inlined.
> So it looks like it's still mistuned for the kernel.
That seems like valuable feedback to give to the GCC developers.
Richi, you can find the whole thread at
http://marc.info/?l=linux-fsdevel&m=123150610901773&w=2
and http://marc.info/?l=linux-fsdevel&m=123150834405285&w=2 is also
relevant.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
--
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