From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail143.messagelabs.com (mail143.messagelabs.com [216.82.254.35]) by kanga.kvack.org (Postfix) with ESMTP id 6A77C8D0039 for ; Tue, 22 Feb 2011 12:04:41 -0500 (EST) Message-ID: <4D63EC77.6070208@mnsu.edu> Date: Tue, 22 Feb 2011 11:03:51 -0600 From: Jeffrey Hundstad MIME-Version: 1.0 Subject: Re: [PATCH v6 0/4] fadvise(DONTNEED) support References: <20110221190713.GM13092@random.random> <20110222132804.GQ13092@random.random> In-Reply-To: <20110222132804.GQ13092@random.random> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrea Arcangeli Cc: Minchan Kim , Andrew Morton , linux-mm , LKML , Steven Barrett , Ben Gamari , Peter Zijlstra , Rik van Riel , Mel Gorman , KOSAKI Motohiro , Wu Fengguang , Johannes Weiner , Nick Piggin , Balbir Singh , KAMEZAWA Hiroyuki On 02/22/2011 07:28 AM, Andrea Arcangeli wrote: > Hi Minchan, > That's my point, we should check if the "thrashing horribly" is really > a "recently" or if it has always happened before with 2.6.18 and previous. I would bet that "thrashing" isn't what he meant. He almost certainly meant "needless I/O" and nothing to do with swapping. I've seen this similar report before. This report is almost always gets answered with a "set your swappiness to an appropriate value" type answer. Or a "your userspace app needs to get smarter" type answer. I think they are trying to do the latter, but need some help from the kernel, and that's what they're trying to do here. -- Jeffrey Hundstad -- 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/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org