Messages in this thread | | | Date | Tue, 8 Dec 1998 12:35:56 GMT | From | "Stephen C. Tweedie" <> | Subject | Re: [PATCH] swapin readahead and fixes |
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Hi,
On Tue, 8 Dec 1998 03:31:25 +0100 (CET), Rik van Riel <H.H.vanRiel@phys.uu.nl> said:
> On a swapout, we will scan ahead of where we are (p->swap_address) > and swap out the next number of pages too.
Yes, but be aware that for good performance you need to combine this with a mechanism to ensure swap space does not become fragmented, and you also need a swap-behind mechanism for sequential accesses (so that if an application is scanning a data set sequentially, the un-accessed space behind the current application "cursor" is being removed from memory just as fast as the stuff about to be accessed is being brought in).
--Stephen
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