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Message-ID: <alpine.LFD.2.00.0901121143070.6528@localhost.localdomain>
Date: Mon, 12 Jan 2009 11:45:03 -0800 (PST)
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: "H. Peter Anvin" <hpa@...or.com>
cc: Andi Kleen <andi@...stfloor.org>,
Bernd Schmidt <bernds_cb1@...nline.de>,
David Woodhouse <dwmw2@...radead.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Harvey Harrison <harvey.harrison@...il.com>,
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>,
Matthew Wilcox <matthew@....cx>,
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
Subject: Re: gcc inlining heuristics was Re: [PATCH -v7][RFC]: mutex: implement
adaptive spinning
On Mon, 12 Jan 2009, H. Peter Anvin wrote:
>
> This is about storage allocation, not aliases. Storage allocation only
> depends on lifetime.
Well, the thing is, code motion does extend life-times, and if you think
you can move stores across each other (even when you can see that they
alias statically) due to type-based alias decisions, that does essentially
end up making what _used_ to be disjoint lifetimes now be potentially
overlapping.
Linus
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