On Wed, 7 Nov 2007, Rik van Riel wrote:
> On Wed, 7 Nov 2007 10:06:10 -0800 (PST)
> Christoph Lameter <[email protected]> wrote:
>
> > On Wed, 7 Nov 2007, Rik van Riel wrote:
> >
> > > How exactly can an anonymous page ever become file backed?
> >
> > When they get assigned a swap entry.
>
> That does not change their status. They're still swap backed.
If they are swap backed then they have a backing store on disk. They are
file backed in some sense.
> > > > Do ramfs pages count as memory backed?
> > >
> > > Since ramfs pages cannot be evicted from memory at all, they
> > > should go into the "noreclaim" page set.
> >
> > Which LRU do they go on.
>
> With the patch set from last weekend, the file LRU.
Argh.
> With the patch set later this week, they'll be in the
> "noreclaim" page set, which is never scanned by the VM.
That sounds better.
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