Re: reclaim the LRU lists full of dirty/writeback pages

[Wu Fengguang <fengguang.wu@xxxxxxxxx>]

> For the single dd inside memcg, ext4 is now working pretty well, with
> least CPU overheads:

Attached are the dd progresses for btrfs, ext4 and xfs in turn, with
btrfs performing the most fluent and fast.

Also attached the "10 memcg each running 1 dd" graph for btrfs. Well
it's unacceptably bumpy because there are no any efforts to make a
round-robin walk between the works from different memcg LRU lists.

Thanks,
Fengguang

Attachment: balance_dirty_pages-task-bw.png
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Attachment: balance_dirty_pages-task-bw.png
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Attachment: balance_dirty_pages-task-bw.png
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Attachment: balance_dirty_pages-task-bw.png
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