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    Subject[PATCH 04/27] writeback: reduce per-bdi dirty threshold ramp up time
    Reduce the dampening for the control system, yielding faster
    convergence. The change is a bit conservative, as smaller values may
    lead to noticeable bdi threshold fluctuates in low memory JBOD setup.

    CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
    CC: Richard Kennedy <richard@rsk.demon.co.uk>
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    mm/page-writeback.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- linux-next.orig/mm/page-writeback.c 2011-03-02 14:52:19.000000000 +0800
    +++ linux-next/mm/page-writeback.c 2011-03-02 15:00:17.000000000 +0800
    @@ -145,7 +145,7 @@ static int calc_period_shift(void)
    else
    dirty_total = (vm_dirty_ratio * determine_dirtyable_memory()) /
    100;
    - return 2 + ilog2(dirty_total - 1);
    + return ilog2(dirty_total - 1);
    }

    /*



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