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Date: Fri, 02 Mar 2007 20:31:04 -0500 From: Rik van Riel <riel@...hat.com> To: Andrew Morton <akpm@...ux-foundation.org> CC: linux-kernel <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org> Subject: Re: [PATCH] free swap space of (re)activated pages Andrew Morton wrote: > On Fri, 02 Mar 2007 15:31:19 -0500 > Rik van Riel <riel@...hat.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... -- Politics is the struggle between those who want to make their country the best in the world, and those who believe it already is. Each group calls the other unpatriotic. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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