From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753339AbaGJMJg (ORCPT ); Thu, 10 Jul 2014 08:09:36 -0400 Received: from zene.cmpxchg.org ([85.214.230.12]:53226 "EHLO zene.cmpxchg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751379AbaGJMJe (ORCPT ); Thu, 10 Jul 2014 08:09:34 -0400 Date: Thu, 10 Jul 2014 08:09:31 -0400 From: Johannes Weiner To: Mel Gorman Cc: Andrew Morton , Linux Kernel , Linux-MM , Linux-FSDevel Subject: Re: [PATCH 4/6] mm: vmscan: Only update per-cpu thresholds for online CPU Message-ID: <20140710120931.GL29639@cmpxchg.org> References: <1404893588-21371-1-git-send-email-mgorman@suse.de> <1404893588-21371-5-git-send-email-mgorman@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1404893588-21371-5-git-send-email-mgorman@suse.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 09, 2014 at 09:13:06AM +0100, Mel Gorman wrote: > When kswapd is awake reclaiming, the per-cpu stat thresholds are > lowered to get more accurate counts to avoid breaching watermarks. This > threshold update iterates over all possible CPUs which is unnecessary. > Only online CPUs need to be updated. If a new CPU is onlined, > refresh_zone_stat_thresholds() will set the thresholds correctly. > > Signed-off-by: Mel Gorman Acked-by: Johannes Weiner