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    SubjectRe: [PATCH 4/5] writeback: per task dirty rate limit
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    On Sat, 2011-08-06 at 16:44 +0800, Wu Fengguang wrote:
    > Add two fields to task_struct.
    >
    > 1) account dirtied pages in the individual tasks, for accuracy
    > 2) per-task balance_dirty_pages() call intervals, for flexibility
    >
    > The balance_dirty_pages() call interval (ie. nr_dirtied_pause) will
    > scale near-sqrt to the safety gap between dirty pages and threshold.
    >
    > XXX: The main problem of per-task nr_dirtied is, if 10k tasks start
    > dirtying pages at exactly the same time, each task will be assigned a
    > large initial nr_dirtied_pause, so that the dirty threshold will be
    > exceeded long before each task reached its nr_dirtied_pause and hence
    > call balance_dirty_pages().
    >
    > Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    > ---
    > include/linux/sched.h | 7 ++
    > mm/memory_hotplug.c | 3 -
    > mm/page-writeback.c | 106 +++++++++-------------------------------
    > 3 files changed, 32 insertions(+), 84 deletions(-)

    No fork() hooks? This way tasks inherit their parent's dirty count on
    clone().


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