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    Subject[PATCH 11/18] writeback: add bdi_dirty_limit() kernel-doc
    Clarify the bdi_dirty_limit() comment.

    Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Acked-by: Jan Kara <jack@suse.cz>
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    mm/page-writeback.c | 11 +++++++++--
    1 file changed, 9 insertions(+), 2 deletions(-)

    --- linux-next.orig/mm/page-writeback.c 2011-05-20 05:08:25.000000000 +0800
    +++ linux-next/mm/page-writeback.c 2011-05-20 05:12:43.000000000 +0800
    @@ -437,10 +437,17 @@ void global_dirty_limits(unsigned long *
    *pdirty = dirty;
    }

    -/*
    +/**
    * bdi_dirty_limit - @bdi's share of dirty throttling threshold
    + * @bdi: the backing_dev_info to query
    + * @dirty: global dirty limit in pages
    + *
    + * Returns @bdi's dirty limit in pages. The term "dirty" in the context of
    + * dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
    + * And the "limit" in the name is not seriously taken as hard limit in
    + * balance_dirty_pages().
    *
    - * Allocate high/low dirty limits to fast/slow devices, in order to prevent
    + * It allocates high/low dirty limits to fast/slow devices, in order to prevent
    * - starving fast devices
    * - piling up dirty pages (that will take long time to sync) on slow devices
    *



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