linux-kernel - Re: [rfc][patch] store-free path walking

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Date:	Wed, 07 Oct 2009 22:34:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <npiggin@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Ravikiran G Thirumalai <kiran@...lex86.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [rfc][patch] store-free path walking

Linus Torvalds <torvalds@...ux-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@...ux.intel.com -- Speaking for myself only.
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