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

Christoph Lameter
2005-11-23T06:36:41Z

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
zones.

> 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.