Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750938AbVKDWni (ORCPT ); Fri, 4 Nov 2005 17:43:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750951AbVKDWni (ORCPT ); Fri, 4 Nov 2005 17:43:38 -0500 Received: from outbound01.telus.net ([199.185.220.220]:27526 "EHLO priv-edtnes57.telusplanet.net") by vger.kernel.org with ESMTP id S1750935AbVKDWnh (ORCPT ); Fri, 4 Nov 2005 17:43:37 -0500 From: Andi Kleen To: Gregory Maxwell Subject: Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 Date: Fri, 4 Nov 2005 23:43:27 +0100 User-Agent: KMail/1.8 Cc: Andy Nelson , mingo@elte.hu, akpm@osdl.org, arjan@infradead.org, arjanv@infradead.org, haveblue@us.ibm.com, kravetz@us.ibm.com, lhms-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mbligh@mbligh.org, mel@csn.ul.ie, nickpiggin@yahoo.com.au, torvalds@osdl.org References: <20051104201248.GA14201@elte.hu> <20051104210418.BC56F184739@thermo.lanl.gov> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200511042343.27832.ak@suse.de> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1191 Lines: 25 On Friday 04 November 2005 22:31, Gregory Maxwell wrote: > On 11/4/05, Andy Nelson wrote: > > I am not enough of a kernel level person or sysadmin to know for certain, > > but I have still big worries about consecutive jobs that run on the > > same resources, but want extremely different page behavior. I > > Thats the idea. The 'hugetlb zone' will only be usable for allocations > which are guaranteed reclaimable. Reclaimable includes userspace > usage (since at worst an in use userspace page can be swapped out then > paged back into another physical location). I don't like it very much. You have two choices if a workload runs out of the kernel allocatable pages. Either you spill into the reclaimable zone or you fail the allocation. The first means that the huge pages thing is unreliable, the second would mean that all the many problems of limited lowmem would be back. None of this is very attractive. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/