From: Andi Kleen <ak@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: "Bryan O'Sullivan" <bos@pathscale.com>,
akpm@osdl.org, paulus@samba.org, benh@kernel.crashing.org,
bcrl@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Define flush_wc, a way to flush write combining store buffers
Date: Wed, 8 Mar 2006 15:35:24 +0100 [thread overview]
Message-ID: <200603081535.25515.ak@suse.de> (raw)
In-Reply-To: <1141855591.10606.12.camel@localhost.localdomain>
On Wednesday 08 March 2006 23:06, Alan Cox wrote:
> On Mer, 2006-03-08 at 13:31 -0800, Bryan O'Sullivan wrote:
> > flush_wc() says nothing about whether {A,B,C} may be reordered with
> > respect to each other, or whether {D,E} may, but it guarantees that
> > {A,B,C} will make it off-CPU before {D,E}. An arch that implements
> > flush_wc() should make the stores occur immediately, if possible.
>
> How is this different to mmiowb() ?
I think he intends it to be a flush instead of an ordering.
(something like CLFLUSH for WC areas)
-Andi
next prev parent reply other threads:[~2006-03-08 22:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-08 21:31 [PATCH] Define flush_wc, a way to flush write combining store buffers Bryan O'Sullivan
2006-03-08 21:38 ` Benjamin Herrenschmidt
2006-03-08 21:37 ` Benjamin LaHaise
2006-03-08 21:43 ` Bryan O'Sullivan
2006-03-08 14:21 ` Andi Kleen
2006-03-08 21:57 ` Bryan O'Sullivan
2006-03-08 14:38 ` Andi Kleen
2006-03-09 1:26 ` Bryan O'Sullivan
2006-03-08 23:40 ` Benjamin Herrenschmidt
2006-03-09 1:48 ` Bryan O'Sullivan
2006-03-08 22:06 ` Alan Cox
2006-03-08 14:35 ` Andi Kleen [this message]
2006-03-08 22:05 ` Bryan O'Sullivan
2006-03-08 14:40 ` Andi Kleen
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