From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f72.google.com (mail-wm0-f72.google.com [74.125.82.72]) by kanga.kvack.org (Postfix) with ESMTP id 8C1D16B0005 for ; Fri, 17 Jun 2016 07:27:13 -0400 (EDT) Received: by mail-wm0-f72.google.com with SMTP id r190so8445396wmr.0 for ; Fri, 17 Jun 2016 04:27:13 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id p1si11513774wjj.65.2016.06.17.04.27.12 for (version=TLS1 cipher=AES128-SHA bits=128/128); Fri, 17 Jun 2016 04:27:12 -0700 (PDT) Subject: Re: [PATCH 24/27] mm, page_alloc: Remove fair zone allocation policy References: <1465495483-11855-1-git-send-email-mgorman@techsingularity.net> <1465495483-11855-25-git-send-email-mgorman@techsingularity.net> From: Vlastimil Babka Message-ID: <9f30977a-ff07-d783-4c21-e13bd2478aa3@suse.cz> Date: Fri, 17 Jun 2016 13:27:09 +0200 MIME-Version: 1.0 In-Reply-To: <1465495483-11855-25-git-send-email-mgorman@techsingularity.net> Content-Type: text/plain; charset=iso-8859-2; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Mel Gorman , Andrew Morton , Linux-MM Cc: Rik van Riel , Johannes Weiner , LKML , Michal Hocko On 06/09/2016 08:04 PM, Mel Gorman wrote: > The fair zone allocation policy interleaves allocation requests between > zones to avoid an age inversion problem whereby new pages are reclaimed > to balance a zone. Reclaim is now node-based so this should no longer be > an issue and the fair zone allocation policy is not free. This patch > removes it. I wonder if fair zone allocation had the side effect of preventing e.g. a small Normal zone to be almost fully occupied by long-lived unreclaimable allocations early in the kernel lifetime. So that might be one thing to watch out for. But otherwise I would agree it should be no longer needed with node-based reclaim. > Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka -- 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