On Tue, 6 Nov 2007, Rik van Riel wrote:
> > I think we could add a flag to the bdi to indicate wheter the backing
> > store is a disk file. In fact you can also deduce if if a device has
> > no writeback capability set in the BDI.
> >
> > > Unfortunately this needs to use a page flag, since the
> > > PG_swapbacked state needs to be preserved all the way
> > > to the point where the page is last removed from the
> > > LRU. Trying to derive the status from other info in
> > > the page resulted in wrong VM statistics in earlier
> > > split VM patchsets.
> >
> > The bdi may avoid that extra flag.
>
> The bdi will no longer be accessible by the time a page
> makes it to free_hot_cold_page, which is one place in the
> kernel where this information is needed.
At that point you need only information about which list the page
was put on. Dont we need something like PageLRU -> PageFileLRU
and PageMemLRU?
The page may change its nature I think? What if a page becomes
swap backed?
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