Messages in this thread | | | Date | Fri, 12 Mar 2004 20:37:59 +1100 | From | Nick Piggin <> | Subject | Re: [PATCH] 2.6.4-rc2-mm1: vm-split-active-lists |
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Andrew Morton wrote:
>Nick Piggin <piggin@cyberone.com.au> wrote: > >>Hmm... I guess it is still smooth because it is swapping out only >> inactive pages. If the standard VM isn't being pushed very hard it >> doesn't scan mapped pages at all which is why it isn't swapping. >> >> I have a preference for allowing it to scan some mapped pages though. >> > >I haven't looked at the code but if, as I assume, it is always scanning >mapped pages, although at a reduced rate then the effect will be the same >as setting swappiness to 100, except it will take longer. > >
Yep
>That effect is to cause the whole world to be swapped out when people >return to their machines in the morning. Once they're swapped back in the >first thing they do it send bitchy emails to you know who. > >>From a performance perspective it's the right thing to do, but nobody likes >it. > >
Yeah. I wonder if there is a way to be smarter about dropping these used once pages without putting pressure on more permanent pages... I guess all heuristics will fall down somewhere or other.
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