Re: [Bug #14141] order 2 page allocation failures (generic)

[Karol Lewandowski]

On Mon, Oct 19, 2009 at 12:54:11PM +0300, Pekka Enberg wrote:
> On Mon, 2009-10-19 at 11:49 +0200, Tobi Oetiker wrote:
> > I have updated a fileserver to 2.6.31 today and I see page
> > allocation failures from several parts of the system ... mostly nfs though ... (it is a nfs server).
> > So I guess the problem must be quite generic:
> 
> Yup, it almost certainly is. Does this patch help?
> 
> http://lkml.org/lkml/2009/10/16/89

This patch seems to help in some cases.  Before applying this patch I
was able to trigger alloc failures on different machine by booting
kernel with "mem=256MB" and doing:

  $ gitk on-full-tree &
  # rmmod e100
  ... wait for few MBs in swap
  # modprobe e100; ifup --force ethX

So here this patch helped -- with it, I was unable to trigger page
allocation failures (testing was short, tough).  However, as I said
here[1], I applied both of Mel's patches (including this one) and that
didn't help my orginal issue (failures after suspend).

[1] http://lkml.org/lkml/2009/10/17/109

Thanks.
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