From: "David S. Miller" <davem@davemloft.net>
To: Andi Kleen <ak@muc.de>
Cc: davidm@hpl.hp.com, clameter@sgi.com,
vda@port.imtp.ilyichevsk.odessa.ua, haveblue@us.ibm.com,
akpm@osdl.org, linux-kernel@vger.kernel.org, mel@csn.ul.ie,
linux-ia64@vger.kernel.org, Jens.Maurer@gmx.net
Subject: Re: [PATCH] add a clear_pages function to clear pages of higher order
Date: Sun, 27 Mar 2005 10:23:13 -0800 [thread overview]
Message-ID: <20050327102313.04498cdc.davem@davemloft.net> (raw)
In-Reply-To: <20050327171220.GA18506@muc.de>
On 27 Mar 2005 19:12:20 +0200
Andi Kleen <ak@muc.de> wrote:
> With non temporal stores
> you guarantee at least one hard cache miss directly after
> the return to user space.
This is true if the cacheline were not present already at
the time of the non-temporal store.
I know what you're trying to say, I'm just clarifying.
The real question is if a large enough ratio of those
cachelines in the page get similarly accessed. I happen
to think the answer to that for any real example is yes.
Yet, I have no way to prove this.
It would be cool to do some hacks under Xen or user-mode
Linux to get some real statistics about this. Actually,
this could be done also with hacks to valgrind or other
similar tools. QEMU could also be used.
next prev parent reply other threads:[~2005-03-27 18:32 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-10 20:35 [PATCH] add a clear_pages function to clear pages of higher order Christoph Lameter
2005-03-10 21:38 ` Dave Hansen
2005-03-10 22:46 ` Christoph Lameter
2005-03-11 1:03 ` Christoph Lameter
2005-03-11 8:08 ` Denis Vlasenko
2005-03-17 1:33 ` Christoph Lameter
2005-03-18 9:54 ` Denis Vlasenko
2005-03-18 15:00 ` Christoph Lameter
2005-03-18 19:28 ` Andi Kleen
2005-03-18 20:19 ` Christoph Lameter
2005-03-21 15:30 ` Denis Vlasenko
2005-03-24 18:34 ` David Mosberger
2005-03-24 18:41 ` Christoph Lameter
2005-03-24 19:03 ` David S. Miller
2005-03-24 22:49 ` Christoph Lameter
2005-03-24 23:13 ` David S. Miller
2005-03-25 2:29 ` David S. Miller
2005-03-25 2:43 ` Christoph Lameter
2005-03-27 17:12 ` Andi Kleen
2005-03-27 18:23 ` David S. Miller [this message]
2005-03-29 1:58 ` Christoph Lameter
2005-04-06 0:15 ` Christoph Lameter
2005-04-06 0:23 ` David Mosberger
2005-04-06 0:33 ` Christoph Lameter
2005-04-06 4:48 ` David Mosberger
2005-04-06 5:15 ` Gerrit Huizenga
2005-04-06 16:03 ` Grant Grundler
2005-03-18 10:12 ` Andi Kleen
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