Messages in this thread | | | Date | Fri, 02 Mar 2007 20:31:04 -0500 | From | Rik van Riel <> | Subject | Re: [PATCH] free swap space of (re)activated pages |
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Andrew Morton wrote: > On Fri, 02 Mar 2007 15:31:19 -0500 > Rik van Riel <riel@redhat.com> wrote: > >> the attached patch frees the swap space of already resident pages >> when swap space starts getting tight, instead of only freeing up >> the swap space taken up by newly swapped in pages. >> >> This should result in the swap space of pages that remain resident >> in memory being freed, allowing kswapd more chances to actually swap >> a page out (instead of rotating it back onto the active list). > > Fair enough. How do we work out if this helps things?
I suspect it should mostly help on desktop systems that slowly fill up (and run out of) swap. I'm not sure how to create that synthetically.
I have seen that swap is kept free much easier in a qsbench test, but that's probably not a very good test since it swaps things in and out all the time...
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