Re: [PATCH]: Free pages from local pcp lists under tight memoryconditions

From: Christoph Lameter
Date: Wed Nov 23 2005 - 01:36:20 EST

On Tue, 22 Nov 2005, Andrew Morton wrote:

> > [PATCH]: This patch free pages (pcp->batch from each list at a time) from
> > local pcp lists when a higher order allocation request is not able to
> > get serviced from global free_list.
> >
> > This should help fix some of the earlier failures seen with order 1 allocations.
> >
> > I will send separate patches for:
> >
> > 1- Reducing the remote cpus pcp

That is already partially done by drain_remote_pages(). However, that
draining is specific to this processors remote pagesets in remote

> This significantly duplicates the existing drain_local_pages().

We need to extract __drain_pcp from all these functions and clearly
document how they differ. Seth probably needs to call __drain_pages for
each processor.
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