From: Robin Holt <holt@sgi.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: William Lee Irwin III <wli@holomorphy.com>,
Christoph Lameter <clameter@sgi.com>,
linux-mm@kvack.org
Subject: Re: ZERO_PAGE refcounting causes cache line bouncing
Date: Mon, 19 Mar 2007 07:03:47 -0500 [thread overview]
Message-ID: <20070319120347.GB6694@lnx-holt.americas.sgi.com> (raw)
In-Reply-To: <45FE261F.3030903@yahoo.com.au>
On Mon, Mar 19, 2007 at 04:56:47PM +1100, Nick Piggin wrote:
> Yes, I have the patch to do it quite easily. Per-node ZERO_PAGE could be
> another option, but that's going to cost another page flag if we wish to
> recognise the zero page in wp faults like we do now (hmm, for some reason
> it is OK to special case it _there_).
Could we do a per-node ZERO_PAGE as a pointer from the node structure
and then use a page_to_nid to get back to the node and compare the page
to the node's zero page instead of using another page flag which would
actually only be used on numa?
Thanks,
Robin
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next prev parent reply other threads:[~2007-03-19 12:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-16 22:17 Christoph Lameter
2007-03-17 4:35 ` William Lee Irwin III
2007-03-19 5:56 ` Nick Piggin
2007-03-19 6:24 ` Nick Piggin
2007-03-19 6:41 ` Nick Piggin
2007-03-19 10:04 ` Nick Piggin
2007-03-19 17:06 ` Christoph Lameter
2007-03-20 2:53 ` Nick Piggin
2007-03-19 12:03 ` Robin Holt [this message]
2007-03-20 2:35 ` Nick Piggin
2007-03-19 12:46 ` William Lee Irwin III
2007-03-20 2:34 ` Nick Piggin
2007-03-19 17:04 ` Christoph Lameter
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