Re: [PATCH 3/3 v2] mm: Avoid resetting wb_start after each writeback round

[Jens Axboe <jaxboe@fusionio.com>]

On 08/05/2010 08:53 PM, Jan Kara wrote:
> WB_SYNC_NONE writeback is done in rounds of 1024 pages so that we don't write
> out some huge inode for too long while starving writeout of other inodes. To
> avoid livelocks, we record time we started writeback in wbc->wb_start and do
> not write out inodes which were dirtied after this time. But currently,
> writeback_inodes_wb() resets wb_start each time it is called thus effectively
> invalidating this logic and making any WB_SYNC_NONE writeback prone to
> livelocks.
> 
> This patch makes sure wb_start is set only once when we start writeback.

Acked-by: Jens Axboe <jaxboe@fusionio.com>

-- 
Jens Axboe


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