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SubjectRe: swapout vs. filemap_sync_pte...?


On Mon, 6 Nov 2000, Jeff Garzik wrote:

> The address_space::writepage callback is called from try_to_swap_out()
> path, and also from the filemap_sync_pte() path. There appears to be no
> way to tell the difference between the two callers. This is not good
> because the semantics are very different: "sync this page" versus "page
> is going away".

For the filemap VMAs (i.e. ones that are based on address_space with
backstore) it is the same thing. For something like tmpfs you have
different VMA-level semantics. Ergo, different VMA methods. They can
be shared with filemap ones, but you definitely don't want ->vm_ops->sync().
End of the problem...

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