Re: Swappiness vs. mmap() and interactive response

[Elladan]

On Wed, Apr 29, 2009 at 09:43:32PM -0700, Andrew Morton wrote:
> On Wed, 29 Apr 2009 21:14:39 -0700 Elladan <elladan@xxxxxxxxxx> 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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