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    SubjectRe: [RFC/T/D][PATCH 2/2] Linux/Guest cooperative unmapped page cache control
    * Avi Kivity <avi@redhat.com> [2010-06-14 18:34:58]:

    > On 06/14/2010 06:12 PM, Dave Hansen wrote:
    > >On Mon, 2010-06-14 at 14:18 +0530, Balbir Singh wrote:
    > >>1. A slab page will not be freed until the entire page is free (all
    > >>slabs have been kfree'd so to speak). Normal reclaim will definitely
    > >>free this page, but a lot of it depends on how frequently we are
    > >>scanning the LRU list and when this page got added.
    > >You don't have to be freeing entire slab pages for the reclaim to have
    > >been useful. You could just be making space so that _future_
    > >allocations fill in the slab holes you just created. You may not be
    > >freeing pages, but you're reducing future system pressure.
    >
    > Depends. If you've evicted something that will be referenced soon,
    > you're increasing system pressure.
    >

    I don't think slab pages care about being referenced soon, they are
    either allocated or freed. A page is just a storage unit for the data
    structure. A new one can be allocated on demand.



    --
    Three Cheers,
    Balbir


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