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    SubjectRe: [PATCH 1/7] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls
    On 08/05/2010 02:12 AM, KOSAKI Motohiro wrote:
    > From: Wu Fengguang<fengguang.wu@intel.com>
    >
    > Fix "system goes unresponsive under memory pressure and lots of
    > dirty/writeback pages" bug.
    >
    > http://lkml.org/lkml/2010/4/4/86
    >
    > In the above thread, Andreas Mohr described that
    >
    > Invoking any command locked up for minutes (note that I'm
    > talking about attempted additional I/O to the _other_,
    > _unaffected_ main system HDD - such as loading some shell
    > binaries -, NOT the external SSD18M!!).
    >
    > This happens when the two conditions are both meet:
    > - under memory pressure
    > - writing heavily to a slow device

    Acked-by: Rik van Riel <riel@redhat.com>

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