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    SubjectRe: [patch 2/4] mm: writeback: distribute write pages across allowable zones
    On 09/20/2011 09:45 AM, Johannes Weiner wrote:
    > This patch allows allocators to pass __GFP_WRITE when they know in
    > advance that the allocated page will be written to and become dirty
    > soon. The page allocator will then attempt to distribute those
    > allocations across zones, such that no single zone will end up full of
    > dirty, and thus more or less, unreclaimable pages.
    > The global dirty limits are put in proportion to the respective zone's
    > amount of dirtyable memory and allocations diverted to other zones
    > when the limit is reached.
    > For now, the problem remains for NUMA configurations where the zones
    > allowed for allocation are in sum not big enough to trigger the global
    > dirty limits, but a future approach to solve this can reuse the
    > per-zone dirty limit infrastructure laid out in this patch to have
    > dirty throttling and the flusher threads consider individual zones.
    > Signed-off-by: Johannes Weiner<>

    Reviewed-by: Rik van Riel <>

    The amount of work done in a __GFP_WRITE allocation looks
    a little daunting, but doing that a million times probably
    outweighs waiting on the disk even once, so...

     \ /
      Last update: 2011-09-20 20:39    [W:0.022 / U:12.160 seconds]
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