Re: [RESEND PATCH] fput: Use unbound workqueue for scheduling delayed fput works

[Al Viro]

On Tue, Dec 17, 2019 at 11:11:12PM +0800, qiwuchen55@xxxxxxxxx wrote:
> From: chenqiwu <chenqiwu@xxxxxxxxxx>
> 
> There is a potential starvation that the number of delayed fput works
> increase rapidly if task exit storm or fs unmount issue happens.

Err...  Details, please, ideally along with a reproducer.  In particular,
I would like to understand what does any of that have to do with umount.
Or to task exits, for that matter - exit_files() is called before
exit_task_work(), so you shouldn't normally be seeing task_work_add()
failures when files get closed on exit(2)...

If you are really observing such problems, it might be worth looking
into the underlying situation - something odd appears to be going
on and I'd rather understand what it is.