From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753971AbcGLNyu (ORCPT ); Tue, 12 Jul 2016 09:54:50 -0400 Received: from gum.cmpxchg.org ([85.214.110.215]:51666 "EHLO gum.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753523AbcGLNys (ORCPT ); Tue, 12 Jul 2016 09:54:48 -0400 Date: Tue, 12 Jul 2016 09:54:35 -0400 From: Johannes Weiner To: Mel Gorman Cc: Andrew Morton , Linux-MM , Rik van Riel , Vlastimil Babka , Minchan Kim , Joonsoo Kim , LKML Subject: Re: [PATCH 05/34] mm, vmscan: begin reclaiming pages on a per-node basis Message-ID: <20160712135435.GB5881@cmpxchg.org> References: <1467970510-21195-1-git-send-email-mgorman@techsingularity.net> <1467970510-21195-6-git-send-email-mgorman@techsingularity.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1467970510-21195-6-git-send-email-mgorman@techsingularity.net> User-Agent: Mutt/1.6.1 (2016-04-27) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jul 08, 2016 at 10:34:41AM +0100, Mel Gorman wrote: > This patch makes reclaim decisions on a per-node basis. A reclaimer knows > what zone is required by the allocation request and skips pages from > higher zones. In many cases this will be ok because it's a GFP_HIGHMEM > request of some description. On 64-bit, ZONE_DMA32 requests will cause > some problems but 32-bit devices on 64-bit platforms are increasingly > rare. Historically it would have been a major problem on 32-bit with big > Highmem:Lowmem ratios but such configurations are also now rare and even > where they exist, they are not encouraged. If it really becomes a > problem, it'll manifest as very low reclaim efficiencies. > > Signed-off-by: Mel Gorman > Acked-by: Hillf Danton Acked-by: Johannes Weiner