From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx193.postini.com [74.125.245.193]) by kanga.kvack.org (Postfix) with SMTP id 745946B004D for ; Wed, 25 Jul 2012 11:31:56 -0400 (EDT) Date: Wed, 25 Jul 2012 10:31:51 -0500 (CDT) From: Christoph Lameter Subject: Re: [RFC PATCH v2] SLUB: enhance slub to handle memory nodes without normal memory In-Reply-To: <500ED4B5.4010104@gmail.com> Message-ID: References: <1343123710-4972-1-git-send-email-jiang.liu@huawei.com> <500ED4B5.4010104@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Jiang Liu Cc: Jiang Liu , WuJianguo , Tony Luck , Pekka Enberg , Matt Mackall , Mel Gorman , Yinghai Lu , KAMEZAWA Hiroyuki , KOSAKI Motohiro , David Rientjes , Minchan Kim , Keping Chen , linux-mm@kvack.org, linux-kernel@vger.kernel.org On Wed, 25 Jul 2012, Jiang Liu wrote: > > There is already a N_NORMAL_MEMORY node map that contains a list of node > > that have *normal* memory usable by slab allocators etc. I think the > > cleanest solution would be to clear the corresponding node bits for your > > special movable only zones. Then you wont be needing to modify other > > subsystems anymore. > > > Hi Chris, > Thanks for your comments! I have thought about the solution mentioned, > but seems it doesn't work. We have node masks for both N_NORMAL_MEMORY and > N_HIGH_MEMORY to distinguish between normal and highmem on platforms such as x86. > But we still don't have such a mechanism to distinguish between "normal" and "movable" > memory. So for memory nodes with only movable zones, we still set N_NORMAL_MEMORY for > them. One possible solution is to add a node mask for "N_NORMAL_OR_MOVABLE_MEMORY", > but haven't tried that yet. Will have a try for that. Hmmm... Maybe add another N_LRU_MEMORY bitmask and replace those N_NORMAL_MEMORY uses with N_LRU_MEMORY as needed? Use N_NORMAL_MEMORY for subsystems that need to do regular (non LRU) allocations that are not movable? _ -- 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