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    SubjectRe: [PATCH] mm: MADV_WILLNEED implementation for anonymous memory
    On Thu, 31 Jan 2008 11:15:08 +0100 Andi Kleen <> wrote:

    > Peter Zijlstra <> writes:
    > >
    > > Ah, that is Lennarts Pulse Audio thing, he has samples in memory which
    > > might not have been used for a while, and he wants to be able to
    > > pre-fetch those when he suspects they might need to be played. So that
    > > once the audio thread comes along and stuffs them down /dev/dsp its all
    > > nice in memory.
    > The real problem that seems to make swapping so slow is that the data
    > tends to be badly fragmented on the swap partition. I suspect if that
    > problem was attached the need for such prefetching would be far less
    > because swap in would be much faster.

    Yeah, the 2.5 switch to physical scanning killed us there.

    I still don't know why my allocate-swapspace-according-to-virtual-address
    change didn't help. Much. Marcelo played with that a bit too.

     \ /
      Last update: 2008-01-31 11:23    [W:0.020 / U:9.604 seconds]
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