On Mon, Dec 05, 2011 at 03:53:21AM -0500, Christoph Hellwig wrote:
> On a system with lots of memory pressure that is stuck on synchronous inode
> reclaim the workqueue code will run one instance of the inode reclaim work
> item on every CPU. which is not what we want. Make sure to mark the
> xfssyncd workqueue as non-reentrant to make sure there only is one instace
> of each running globally. Also stop using special paramater for the
> workqueue; now that we guarantee each fs has only running one of each works
> at a time there is no need to artificially lower max_active and compensate
> for that by setting the WQ_CPU_INTENSIVE flag.
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Ok, I've had a look in detail at what the WQ_NON_REENTRANT flag does
and I agree that this is the correct behaviour for the xfssyncd -
only one instance per filesystem should run at any given time.
Reviewed-by: Dave Chinner <dchinner@xxxxxxxxxx>