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    SubjectRe: [Bug #14141] order 2 page allocation failures in iwlagn
    On Mon, Oct 19, 2009 at 01:01:15PM -0400, Christoph Hellwig wrote:
    > On Tue, Oct 20, 2009 at 01:18:15AM +0900, Chris Mason wrote:
    > > Waiting doesn't make it synchronous from the elevator point of view ;)
    > > If you're using WB_SYNC_NONE, it's a async write. WB_SYNC_ALL makes it
    > > a sync write. I only see WB_SYNC_NONE in vmscan.c, so we should be
    > > using the async congestion wait. (the exception is xfs which always
    > > does async writes).
    >
    > That's only because those people who did the global sweep did not bother
    > to convert it or even tell the list about it. I have a patch in my
    > QA queue to change it..

    Yes, we just didn't realize XFS was missed. Sorry. I wasn't trying to
    blame xfs for being behind, just mentioning that we've got about 10
    different variables here and I'm having a hard time figuring out which
    ones to push on.

    -chris



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