Messages in this thread | | | Date | Wed, 7 Nov 2007 10:18:48 -0800 (PST) | From | Christoph Lameter <> | Subject | Re: [RFC PATCH 3/10] define page_file_cache |
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On Wed, 7 Nov 2007, Rik van Riel wrote:
> On Wed, 7 Nov 2007 10:06:10 -0800 (PST) > Christoph Lameter <clameter@sgi.com> 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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