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SubjectRe: [PATCH] 2.4.1 find_page_nolock fixes

On Tue, 30 Jan 2001, Rik van Riel wrote:

> Hi Linus,
>
> the patch below contains 3 small changes to mm/filemap.c:
>
> 1. replace the aging in __find_page_nolock() with setting
> PageReferenced(), otherwise a large number of small
> reads from (or writes to) a page can drive up the page
> age unfairly
>
> 2. remove the wakeup of kswapd from __find_page_nolock(),
> the wakeup condition is complex and leaving out the
> wakeup has no influence on any workload I tested in
> the last few weeks
>
> 3. add a __find_page_simple(), which is like __find_page_nolock()
> but only needs 2 arguments and doesn't touch the page ... this
> can be used by IO clustering and other things that really don't
> want to influence page aging, removing the 3rd argument also
> keeps things simple

The swapin readahead still makes the page referenced bit set, and it
should not as we discussed previously.



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