Re: [PATCH] writeback: Fix occasional slow sync(1)

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On Mon, 15 Jul 2013 11:45:14 +0200 Jan Kara <jack@xxxxxxx> wrote:

> In case when system contains no dirty pages, wakeup_flusher_threads()
> will submit WB_SYNC_NONE writeback for 0 pages so wb_writeback() exits
> immediately without doing anything. Thus sync(1) will write all the
> dirty inodes from a WB_SYNC_ALL writeback pass which is slow.
> 
> Fix the problem by using get_nr_dirty_pages() in
> wakeup_flusher_threads() instead of calculating number of dirty pages
> manually. That function also takes number of dirty inodes into account.

Fair enough.

> CC: stable@xxxxxxxxxxxxxxx

Unexpected.  What was your thinking here?
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