From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail172.messagelabs.com (mail172.messagelabs.com [216.82.254.3]) by kanga.kvack.org (Postfix) with SMTP id 6FB3F6B004A for ; Wed, 29 Sep 2010 10:12:29 -0400 (EDT) Date: Wed, 29 Sep 2010 09:12:25 -0500 (CDT) From: Christoph Lameter Subject: Re: zone state overhead In-Reply-To: <20100929100307.GA14204@csn.ul.ie> Message-ID: References: <20100928050801.GA29021@sli10-conroe.sh.intel.com> <20100928133059.GL8187@csn.ul.ie> <20100929100307.GA14204@csn.ul.ie> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org To: Mel Gorman Cc: David Rientjes , Shaohua Li , linux-mm@kvack.org List-ID: On Wed, 29 Sep 2010, Mel Gorman wrote: > Alternatively we could revisit Christoph's suggestion of modifying > stat_threshold when under pressure instead of zone_page_state_snapshot. Maybe > by temporarily stat_threshold when kswapd is awake to a per-zone value > such that > > zone->low + threshold*nr_online_cpus < high Updating the threshold also is expensive. I thought more along the lines of reducing the threshold for good if the VM runs into reclaim trouble because of too high fuzziness in the counters. -- 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