Messages in this thread | | | Date | Mon, 7 Apr 2003 14:43:12 +0200 | From | Jörn Engel <> | Subject | Re: An idea for prefetching swapped memory... |
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On Mon, 7 April 2003 14:32:26 +0200, David Zaffiro wrote: > > >The idea was about prefetching swapped out pages when some memory is free, > >the CPU is idle and the I/O load is low. > > > >So this should not 'cost' much but behave better on following situation: > >(I think there are even more such situations, this one should just be an > >example) > > Wouldn't it cost almost twice as much when the user requests a different > task, instead of the just swaped-in "last swaped-out task(s)"?! > > Instead of loading this directly into a free portion of phys. memory, the > just-swapped-in-ex-swapped-out task(s) would need to be swapped-out *again* > in favour of the to-be-swaped-in task... > > Or am I wrong here?
Partially. If done right, the swapout would simply free those pages. The information is already on the disk and unchanged, after all.
Jörn
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