From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752386AbcGLRTJ (ORCPT ); Tue, 12 Jul 2016 13:19:09 -0400 Received: from gum.cmpxchg.org ([85.214.110.215]:51876 "EHLO gum.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750874AbcGLRTH (ORCPT ); Tue, 12 Jul 2016 13:19:07 -0400 Date: Tue, 12 Jul 2016 13:18:45 -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 21/34] mm, vmscan: only wakeup kswapd once per node for the requested classzone Message-ID: <20160712171845.GA7307@cmpxchg.org> References: <1467970510-21195-1-git-send-email-mgorman@techsingularity.net> <1467970510-21195-22-git-send-email-mgorman@techsingularity.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1467970510-21195-22-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 10:34:57AM +0100, Mel Gorman wrote: > kswapd is woken when zones are below the low watermark but the wakeup > decision is not taking the classzone into account. Now that reclaim is > node-based, it is only required to wake kswapd once per node and only if > all zones are unbalanced for the requested classzone. > > Note that one node might be checked multiple times if the zonelist is > ordered by node because there is no cheap way of tracking what nodes have > already been visited. For zone-ordering, each node should be checked only > once. > > Signed-off-by: Mel Gorman > Acked-by: Vlastimil Babka Acked-by: Johannes Weiner