Re: The performance and behaviour of the anti-fragmentation related patches

Christoph Lameter
2007-03-02T17:09:38Z

On Fri, 2 Mar 2007, Nick Piggin wrote:

> > Oh just run a 32GB SMP system with sparsely freeable pages and lots of
> > allocs and frees and you will see it too. F.e try Linus tree and mlock
> > a large portion of the memory and then see the fun starting. See also
> > Rik's list of pathological cases on this.
>
> Ah, so your problem is lots of unreclaimable pages. There are heaps
> of things we can try to reduce the rate at which we scan those.

Well this is one possible sympton of the basic issue of having too many
page structs. I wonder how long we can patch things up.