From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Mon, 19 Mar 2007 07:03:47 -0500 From: Robin Holt Subject: Re: ZERO_PAGE refcounting causes cache line bouncing Message-ID: <20070319120347.GB6694@lnx-holt.americas.sgi.com> References: <20070317043545.GH8915@holomorphy.com> <45FE261F.3030903@yahoo.com.au> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <45FE261F.3030903@yahoo.com.au> Sender: owner-linux-mm@kvack.org Return-Path: To: Nick Piggin Cc: William Lee Irwin III , Christoph Lameter , linux-mm@kvack.org List-ID: 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org