Messages in this thread | | | Date | Mon, 15 Mar 2004 12:49:14 +0100 | From | Andrea Arcangeli <> | Subject | Re: [2.4] heavy-load under swap space shortage |
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Hi Nick,
On Mon, Mar 15, 2004 at 03:38:51PM +1100, Nick Piggin wrote: > > > Andrea Arcangeli wrote: > > > > >I don't see other ways to optimize it (and I never enjoyed too much the > >per-zone lru since it has some downside too with a worst case on 2G > >systems). peraphs a further optimization could be a transient per-cpu > >lru refiled only by the page reclaim (so absolutely lazy while lots of > >ram is free), but maybe that's already what you're doing when you say > >"Adding/removing sixteen pages for one taking of the lock". Though the > >fact you say "sixteen pages" sounds like it's not as lazy as it could > >be. > > > > Hi Andrea, > What are the downsides on a 2G system?
it is the absolutely worst case since both lru could be of around the same size (800M zone-normal-lru and 1.2G zone-highmem-lru), maximizing the loss of "age" information needed for optimal reclaim decisions. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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