linux-kernel - Re: [PATCH v6 0/4] fadvise(DONTNEED) support

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Date:	Tue, 22 Feb 2011 11:03:51 -0600
From:	Jeffrey Hundstad <jeffrey.hundstad@...u.edu>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Steven Barrett <damentz@...uorix.net>,
	Ben Gamari <bgamari.foss@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>, Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH v6 0/4] fadvise(DONTNEED) support

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

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