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    SubjectRe: [PATCH] mm: limit lowmem_reserve
    Date
    On Thursday 18 May 2006 17:11, Nick Piggin wrote:
    > If we're under memory pressure, kswapd will try to free up any candidate
    > zone, yes.
    >
    > > On my test case this indeed happens and my ZONE_DMA never goes below 3000
    > > pages free. If I lower the reserve even further my pages free gets stuck
    > > at 3208 and can't free any more, and doesn't ever drop below that either.
    > >
    > > Here is the patch I was proposing
    >
    > What problem does that fix though?

    It's a generic concern and I honestly don't know how significant it is which
    is why I'm asking if it needs attention. That concern being that any time
    we're under any sort of memory pressure, ZONE_DMA will undergo intense
    reclaim even though there may not really be anything specifically going on in
    ZONE_DMA. It just seems a waste of cycles doing that.

    --
    -ck
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