Re: regression in page writeback

[Andrew Morton]

On Wed, 23 Sep 2009 10:49:58 +0800 Wu Fengguang <fengguang.wu@xxxxxxxxx> wrote:

> > After the sleep we repoll all queues.
> 
> I mean, it is not always necessary. Only when _all_ superblocks cannot
> writeback their inodes (eg. all in congestion), we should wait.

Well.  The code will still submit MAX_WRITEBACK_PAGES pages to _some_
queue in that situation.

But yup, maybe that's a bug!  Sounds easy to fix.  It doesn't justify
rewriting the whole world and then saying "look, the new code is faster
than the old code which had a bug which I knew about but didn't fix".

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