On Fri, 21 Apr 2000, Andrea Arcangeli wrote:
> On Fri, 21 Apr 2000, Rik van Riel wrote:
>
> >Ahh, but you're forgetting that it is usually not
> >relevant to keep around unmapped pages from which
> >somebody did a read() because the data is copied
> >somewhere else now.
>
> This make no sense to me.
Having pages make _two_ passes through the second chance queue
in shrink_mmap() gives them a better chance to age. Not having
the referenced bit set for them will give them the "advantage"
of whatever random position in the queue they're in the moment
they are unmapped.
Remember that the queue isn't LRU but more like second chance
fifo...
regards,
Rik
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