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    SubjectRe: [PATCH 00/03] Unmapped: Separate unmapped and mapped pages
    On Fri, 2006-03-10 at 14:19 +0100, Magnus Damm wrote:
    > On 3/10/06, Arjan van de Ven <> wrote:
    > > > Apply on top of 2.6.16-rc5.
    > > >
    > > > Comments?
    > >
    > >
    > > my big worry with a split LRU is: how do you keep fairness and balance
    > > between those LRUs? This is one of the things that made the 2.4 VM suck
    > > really badly, so I really wouldn't want this bad...
    > Yeah, I agree this is important. I think linux-2.4 tried to keep the
    > LRU list lengths in a certain way (maybe 2/3 of all pages active, 1/3
    > inactive). In 2.6 there is no such thing, instead the number of pages
    > scanned is related to the current scanning priority.

    This sounds wrong, the active and inactive lists are balanced to a 1:1
    ratio. This is happens because the scan speed is directly proportional
    to the size of the list. Hence the largest list will shrink fastest -
    this gives a natural balance to equal sizes.


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      Last update: 2006-03-11 22:03    [W:2.391 / U:0.420 seconds]
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