On Wed, Jan 20, 2016 at 10:17:23PM +0900, Tetsuo Handa wrote:

What happens if memory allocation requests from items using this workqueue
got stuck due to OOM livelock? Are pending items in this workqueue cannot
be processed because this workqueue was created without WQ_MEM_RECLAIM?

If something gets stuck due to OOM livelock, anything which tries to
allocate memory can hang.  That's why it's called a livelock.
WQ_MEM_RECLAIM or not wouldn't make any difference.

I don't know whether accessing swap memory depends on this workqueue.
But if disk driver depends on this workqueue for accessing swap partition
on the disk, some event is looping inside memory allocator will result in
unable to process disk I/O request for accessing swap partition on the disk?

What you're saying is too vauge for me to decipher exactly what you
have on mind.  Can you please elaborate?

-- 
tejun

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