Re: cp file /dev/zero <-> cache [was Re: increasing page size]

["Stephen C. Tweedie" <sct@redhat.com>]

Hi Rik,

On Sun, 5 Jul 1998 21:31:56 +0200 (CEST), Rik van Riel
<H.H.vanRiel@phys.uu.nl> said:

> A few months ago someone (who?) posted a patch that modified
> kswapd's internals to only unmap clean pages when told to.

> If I can find the patch, I'll integrate it and let kswapd
> only swap clean pages when:
> - page_cache_size * 100 > num_physpages * page_cache.borrow_percent
> or
> - (buffer_mem >> PAGE_SHIFT) * 100 > num_physpages * buffermem.borrow_percent

I'm not sure what that is supposed to achieve, and I'm not sure how well
we expect such tinkering to work uniformly on 8MB and 512MB machines.
Unmapping is not an issue with respect to cache sizes.

--Stephen
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