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SubjectRe: 2.1.91 swap performance: jerky.


On Sat, 28 Mar 1998, Itai Nahshon wrote:
>
> The idea sounds right, I have questions regarding limitation on
> current implementation:
> 1. If something is swapped out but the pages that it occupied
> never used later, will it have to be paged-in from disk or can
> the copy in memory be reused without any farter io?

If the page is never used again, it will never be paged in: an exit of the
process will just free up the page on disk, and a "fork()" will duplicate
the pointer to the disk rather than page it in in order to duplicate it.

> 2. Do the background swapper compete with interactive processes
> on the disk bandwith?

Yes. This is obviously a concern, but hopefully the background swapper is
never _too_ aggressive, ie it shouldn't be aggressive enough for this to
be a real issue.

The parameters may need more tweaking, and there may be some other minor
changes in the air, but on the whole the basics should be there now.

Linus


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