Re: [PATCH 4/4] capture pages freed during direct reclaim for allocationby the reclaimer

[Christoph Lameter]

Andy Whitcroft wrote:

>> At the beginning of reclaim just flush all pcp pages and then do not allow pcp
>> refills again until reclaim is finished?
> 
> Not entirely, some pages could get trapped there for sure.  But it is
> parallel allocations we are trying to guard against.  Plus we already flush
> the pcp during reclaim for higher orders.

So we just would need to forbid refilling the pcp.

Parallel allocations are less a problem if the freed order 0 pages get merged
immediately into the order 1 freelist. Of course that will only work 50% of
the time but it will have a similar effect to this patch.

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