Sami Farin wrote:
> On Tue, Sep 04, 2007 at 21:37:35 -0400, Rik van Riel wrote:
>> Is the system trying to evict pages like crazy when your
>> system becomes unusable?
> 
> I think so..
> 
>> If so, I wonder if kswapd is simply doing the wrong thing
>> and trying to evict data from all zones, simply because the
>> highmem zone is low on free pages...
> 
> *shrug*

The attached patch should make sure kswapd does not free an
excessive number of pages in zone_normal just because the
pages in zone_highmem are difficult to free.

It does give kswapd a large margin to continue putting equal
pressure on all zones in normal situations.

Sami, could you try out this patch to see if it helps your
situation?

Signed-off-by: Rik van Riel <riel@redhat.com>