On 12/08/2010 10:16 AM, Johannes Weiner wrote:
Kswapd tries to rebalance zones persistently until their high watermarks are restored. If the amount of unreclaimable pages in a zone makes this impossible for reclaim, though, kswapd will end up in a busy loop without a chance of reaching its goal. This behaviour was observed on a virtual machine with a tiny Normal-zone that filled up with unreclaimable slab objects. This patch makes kswapd skip rebalancing on such 'hopeless' zones and leaves them to direct reclaim. Signed-off-by: Johannes Weiner<hannes@xxxxxxxxxxx>
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