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    SubjectRe: [patch] use cheaper elv_queue_empty when unplug a device
    On Wed, Mar 30 2005, Nick Piggin wrote:
    > Nick Piggin wrote:
    > >Jens Axboe wrote:
    > >
    > >>Looks good, I've been toying with something very similar for a long time
    > >>myself.
    > >>
    > >
    > >Here is another thing I just noticed that should further reduce the
    > >locking by at least 1, sometimes 2 lock/unlock pairs per request.
    > >At the cost of uglifying the code somewhat. Although it is pretty
    > >nicely contained, so Jens you might consider it acceptable as is,
    > >or we could investigate how to make it nicer if Kenneth reports some
    > >improvement.
    > >
    > >Note, this isn't runtime tested - it could easily have a bug.
    > >
    > OK - I have booted this on a 4-way SMP with SCSI disks, and done
    > some IO tests, and no hangs.
    > So Kenneth if you could look into this one as well, to see if
    > it is worthwhile, that would be great.

    For that to work, you have to change the get_io_context() allocation to
    be GFP_ATOMIC.

    Jens Axboe

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      Last update: 2005-04-08 11:49    [W:0.019 / U:26.740 seconds]
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