linux-kernel - Re: Swappiness vs. mmap() and interactive response

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Message-ID: <20090430045525.GC6110@eskimo.com>
Date:	Wed, 29 Apr 2009 21:55:26 -0700
From:	Elladan <elladan@...imo.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Elladan <elladan@...imo.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Theodore Tso <tytso@....edu>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, linux-mm <linux-mm@...ck.org>,
	Rik van Riel <riel@...hat.com>
Subject: Re: Swappiness vs. mmap() and interactive response

On Wed, Apr 29, 2009 at 09:43:32PM -0700, Andrew Morton wrote:
> On Wed, 29 Apr 2009 21:14:39 -0700 Elladan <elladan@...imo.com> wrote:
> 
> > > Elladan, have you checked to see whether the Mapped: number in
> > > /proc/meminfo is decreasing?
> > 
> > Yes, Mapped decreases while a large file copy is ongoing.  It increases again
> > if I use the GUI.
> 
> OK.  If that's still happening to an appreciable extent after you've
> increased /proc/sys/vm/swappiness then I'd wager that we have a
> bug/regression in that area.
> 
> Local variable `scan' in shrink_zone() is vulnerable to multiplicative
> overflows on large zones, but I doubt if you have enough memory to
> trigger that bug.

No, I only have 4GB.

This appears to happen with swappiness set to 0 or 60.

-Elladan
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