Re: clustering page-ins

Chuck Lever (cel@monkey.org)
Sun, 25 Jul 1999 14:04:13 -0400 (EDT)

On Sun, 25 Jul 1999, Gregory Maxwell wrote:
> On Sat, 24 Jul 1999, Chuck Lever wrote:
> > would it
> > be a good idea to maintain a separate queue for these that, say,
> > shrink_mmap could collect pages from, or actually free them via
> > __free_page?
>
> Depends on the overhead of maintaint the other queue (and scanning it), I
> suppose.. It would be good to allow those buffers to stay behind a bit
> (Just in case) but they should certantly be the first to go.. (I wouldn't
> want the readahead throwing out other apps cache because of usless data).

i'm thinking a better way to do this might be to clear the page reference
bit behind the actual faulting page, but only as long as we're scheduling
read-ahead I/Os. in other words, save metadata about the previously read
ahead data so that those pages can be marked as unreferenced once we know
it's OK to continue reading ahead.

- Chuck Lever

--
corporate:	<chuckl@netscape.com>
personal:	<chucklever@netscape.net> or <cel@monkey.org>


The Linux Scalability project:
	http://www.citi.umich.edu/projects/linux-scalability/






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