From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx149.postini.com [74.125.245.149]) by kanga.kvack.org (Postfix) with SMTP id 8AEBC6B0005 for ; Sun, 7 Apr 2013 11:23:02 -0400 (EDT) Received: by mail-ve0-f177.google.com with SMTP id jw11so4749974veb.36 for ; Sun, 07 Apr 2013 08:23:01 -0700 (PDT) Message-ID: <51618F5A.3060005@gmail.com> Date: Sun, 07 Apr 2013 11:23:06 -0400 From: KOSAKI Motohiro MIME-Version: 1.0 Subject: Re: [PATCH 0/3] mm: fixup changers of per cpu pageset's ->high and ->batch References: <1365194030-28939-1-git-send-email-cody@linux.vnet.ibm.com> In-Reply-To: <1365194030-28939-1-git-send-email-cody@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-2022-JP Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Cody P Schafer Cc: Andrew Morton , Mel Gorman , Linux MM , LKML , kosaki.motohiro@gmail.com (4/5/13 4:33 PM), Cody P Schafer wrote: > In one case while modifying the ->high and ->batch fields of per cpu pagesets > we're unneededly using stop_machine() (patches 1 & 2), and in another we don't have any > syncronization at all (patch 3). > > This patchset fixes both of them. > > Note that it results in a change to the behavior of zone_pcp_update(), which is > used by memory_hotplug. I _think_ that I've diserned (and preserved) the > essential behavior (changing ->high and ->batch), and only eliminated unneeded > actions (draining the per cpu pages), but this may not be the case. at least, memory hotplug need to drain. -- 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