Messages in this thread | | | Subject | Re: [PATCH] 2.2.17pre7 VM enhancement Re: I/O performance on 2.4.0-test2 | From | "Juan J. Quintela" <> | Date | 11 Jul 2000 20:03:41 +0200 |
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>>>>> "andrea" == Andrea Arcangeli <andrea@suse.de> writes:
andrea> On Tue, 11 Jul 2000, Rik van Riel wrote: >> This is why LRU is wrong and we need page aging (which >> approximates both LRU and NFU). >> >> The idea is to remove those pages from memory which will >> not be used again for the longest time, regardless of in >> which 'state' they live in main memory. >> >> (and proper page aging is a good approximation to this)
andrea> It will still drop _all_ VM mappings from memory if you left "cp /dev/zero andrea> ." in background for say 2 hours. This in turn mean that during streming andrea> I/O you'll have _much_ more than the current swapin/swapout troubles.
If you are copying in the background a cp and you don't touch your vi/emacs/whatever pages in 2 hours (i.e. age = 0) then I think that it is ok for that pages to be swaped out. Notice that the cage pages will have _initial age_ and the pages of the binaries will have an _older_ age.
Later, Juan.
-- In theory, practice and theory are the same, but in practice they are different -- Larry McVoy
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