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    SubjectRe: [RFC PATCH 3/10] define page_file_cache
    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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