From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by e4.ny.us.ibm.com (8.12.11/8.12.11) with ESMTP id j4GKlWH0010799 for ; Mon, 16 May 2005 16:47:33 -0400 Received: from d01av04.pok.ibm.com (d01av04.pok.ibm.com [9.56.224.64]) by d01relay04.pok.ibm.com (8.12.10/NCO/VER6.6) with ESMTP id j4GKlWXn090064 for ; Mon, 16 May 2005 16:47:32 -0400 Received: from d01av04.pok.ibm.com (loopback [127.0.0.1]) by d01av04.pok.ibm.com (8.12.11/8.13.3) with ESMTP id j4GKlW4v021287 for ; Mon, 16 May 2005 16:47:32 -0400 Subject: Re: [PATCH] Factor in buddy allocator alignment requirements in node memory alignment From: Dave Hansen In-Reply-To: References: <1116274451.1005.106.camel@localhost> Content-Type: text/plain Date: Mon, 16 May 2005 13:47:19 -0700 Message-Id: <1116276439.1005.110.camel@localhost> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: christoph Cc: linux-mm , shai@scalex86.org, Linux Kernel Mailing List List-ID: On Mon, 2005-05-16 at 12:43 -0700, christoph wrote: > On Mon, 16 May 2005, Dave Hansen wrote: > > On Mon, 2005-05-16 at 12:05 -0700, christoph wrote: > > > Memory for nodes on i386 is currently aligned on 2 MB boundaries. > > > However, the buddy allocator needs pages to be aligned on > > > PAGE_SIZE << MAX_ORDER which is 8MB if MAX_ORDER = 11. > > > > Why do you need this? Are you planning on allowing NUMA KVA remap pages > > to be handed over to the buddy allocator? That would be a major > > departure from what we do now, and I'd be very interested in seeing how > > that is implemented before a infrastructure for it goes in. > > Because the buddy allocator is complaining about wrongly allocated zones! Just because it complains doesn't mean that anything is actually wrong :) Do you know which pieces of code actually break if the alignment doesn't meet what that warning says? -- Dave -- 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: aart@kvack.org