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    SubjectRe: [PATCH 0/10] Per-bdi writeback flusher threads v12
    On Thu, 2009-06-25 at 12:41 +0200, Jens Axboe wrote:
    > Hi,
    > Here's the 12th version of the writeback patches. Changes since v11:
    > - Fixup kthread_run() error check, it should use IS_ERR() instead of
    > checking for NULL. Thanks Andrew.
    > - Fix a silly buglet that would quickly respawn otherwise idle threads
    > once they had exited. This was due to an inverted if test. Didn't cause
    > any harm except potentially too many writeback threads setting idle in
    > the system.
    > - Integrate kupdate periodic writeback with the explicit writeback. Cleans
    > that part up.
    > - Update to 2.6.31-rc1. With the recent patches from viro and hch, v11
    > did not apply cleanly at all to 2.6.31-rc1.
    > For ease of patching, I've put the full diff here:
    > and also stored this in a writeback-v12 branch that will not change,
    > you can pull that into Linus tree from here:
    > git:// writeback-v12

    > Please test and report results/interesting finds.
    I tested it against 2.6.31-rc1 on a couple of machines.
    1) System didn't hang;
    2) Comapring with previous bdi flusher versions, I didn't find clear performance

    > Thanks! The target
    > for this patchset is 2.6.32 and it'll be sitting (and has been for the past

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