Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030735AbWLEUCK (ORCPT ); Tue, 5 Dec 2006 15:02:10 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S968668AbWLEUCJ (ORCPT ); Tue, 5 Dec 2006 15:02:09 -0500 Received: from omx2-ext.sgi.com ([192.48.171.19]:54717 "EHLO omx2.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S968664AbWLEUCG (ORCPT ); Tue, 5 Dec 2006 15:02:06 -0500 Date: Tue, 5 Dec 2006 12:01:57 -0800 (PST) From: Christoph Lameter To: Andrew Morton cc: Mel Gorman , Linux Memory Management List , Linux Kernel Mailing List Subject: Re: [PATCH] Add __GFP_MOVABLE for callers to flag allocations that may be migrated In-Reply-To: <20061205112541.2a4b7414.akpm@osdl.org> Message-ID: References: <20061130170746.GA11363@skynet.ie> <20061130173129.4ebccaa2.akpm@osdl.org> <20061201110103.08d0cf3d.akpm@osdl.org> <20061204140747.GA21662@skynet.ie> <20061204113051.4e90b249.akpm@osdl.org> <20061204120611.4306024e.akpm@osdl.org> <20061204131959.bdeeee41.akpm@osdl.org> <20061204142259.3cdda664.akpm@osdl.org> <20061205112541.2a4b7414.akpm@osdl.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 954 Lines: 24 On Tue, 5 Dec 2006, Andrew Morton wrote: > > We always run reclaim against the whole zone not against parts. Why > > would we start running reclaim against a portion of a zone? > > Oh for gawd's sake. Yes indeed. Another failure to answer a simple question. > If you want to allocate a page from within the first 1/4 of a zone, and if > all those pages are in use for something else then you'll need to run > reclaim against the first 1/4 of that zone. Or fail the allocation. Or > run reclaim against the entire zone. The second two options are > self-evidently dumb. Why would one want to allocate from the 1/4th of a zone? (Are we still discussing Mel's antifrag scheme or what is this about?) - 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/