From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Wed, 12 Sep 2007 14:17:32 -0700 (PDT) From: Christoph Lameter Subject: Re: [PATCH 4/6] Have zonelist contains structs with both a zone pointer and zone_idx In-Reply-To: <20070912210605.31625.85794.sendpatchset@skynet.skynet.ie> Message-ID: References: <20070912210444.31625.65810.sendpatchset@skynet.skynet.ie> <20070912210605.31625.85794.sendpatchset@skynet.skynet.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Mel Gorman Cc: Lee.Schermerhorn@hp.com, kamezawa.hiroyu@jp.fujitsu.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Wed, 12 Sep 2007, Mel Gorman wrote: > /* > + * This struct contains information about a zone in a zonelist. It is stored > + * here to avoid dereferences into large structures and lookups of tables > + */ > +struct zoneref { > + struct zone *zone; /* Pointer to actual zone */ > + int zone_idx; /* zone_idx(zoneref->zone) */ > +}; Well the structure is going to be 12 bytes wide. Since pointers have to be aligned to 8 bytes we will effectively have to use 16 bytes anyways. There is no additional memory use if we would be adding another 4 bytes. But lets get this merged. We can sort this out later. Too many oscillations already. -- 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