From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andi Kleen <andi@firstfloor.org>
Subject: Re: [rfc][patch] store-free path walking
Date: Wed, 07 Oct 2009 22:34:24 +0200
Message-ID: <87eipfymcv.fsf@basil.nowhere.org>
References: <20091006064919.GB30316@wotan.suse.de>
	<20091006101414.GM5216@kernel.dk>
	<20091006122623.GE30316@wotan.suse.de>
	<20091006124941.GS5216@kernel.dk>
	<20091007085849.GN30316@wotan.suse.de>
	<alpine.LFD.2.01.0910070742260.3432@localhost.localdomain>
	<alpine.LFD.2.01.0910070911080.3432@localhost.localdomain>
	<20091007164622.GX30316@wotan.suse.de>
	<alpine.LFD.2.01.0910071222230.3432@localhost.localdomain>
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Cc: Nick Piggin <npiggin@suse.de>, Jens Axboe <jens.axboe@oracle.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	linux-fsdevel@vger.kernel.org,
	Ravikiran G Thirumalai <kiran@scalex86.org>,
	Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Return-path: <linux-kernel-owner+glk-linux-kernel-3=40m.gmane.org-S1755072AbZJGUfE@vger.kernel.org>
In-Reply-To: <alpine.LFD.2.01.0910071222230.3432@localhost.localdomain> (Linus Torvalds's message of "Wed, 7 Oct 2009 12:25:03 -0700 (PDT)")
Sender: linux-kernel-owner@vger.kernel.org
List-Id: linux-fsdevel.vger.kernel.org

Linus Torvalds <torvalds@linux-foundation.org> writes:
>
> Sad. But we do have the added requirement that we want to keep the 
> commonly used fields together in the same cacheline, so maybe it's 
> unavoidable.

With some strategic prefetches it might be cheap enough to use 
two cache lines. Just fetch it with the other.

-Andi
-- 
ak@linux.intel.com -- Speaking for myself only.