On Fri, Aug 23, 2013 at 6:40 AM, Andrew Morton
[off-list ref] wrote:

On Thu, 22 Aug 2013 17:53:10 +0800 Sha Zhengju [off-list ref] wrote:

quoted

This patch is to add memcg routines to count writeback pages

Well OK, but why?  What use is the feature?  In what ways are people
suffering due to its absence?

My apologies for not explaining it clearly.

It's subset of memcg dirty page accounting(including dirty, writeback,
nfs_unstable pages from a broad sense), which can provide a more sound
knowledge of memcg behavior. That would be straightforward to add new
features like memcg dirty page throttling and even memcg aware
flushing.
However, the dirty one is more complicated and performance senstive,
so I need more efforts to improve it and let the writeback patch go
first.  Afterwards I'll only focus on dirty page itself.

-- 
Thanks,
Sha

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