Re: [RFC 0/8] Cpuset aware writeback

[Christoph Lameter]

On Tue, 16 Jan 2007, Peter Zijlstra wrote:

> > B. We add a new counter NR_UNRECLAIMABLE that is subtracted
> >    from the available pages in a node. This allows us to
> >    accurately calculate the dirty ratio even if large portions
> >    of the node have been allocated for huge pages or for
> >    slab pages.
> 
> What about mlock'ed pages?

mlocked pages can be dirty and written back right? So for the
dirty ratio calculation they do not play a role. We may need a
separate counter for mlocked pages if they are to be considered
for other decisions in the VM.

> Otherwise it all looks good.
> 
> Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>

Thanks.
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