Re: [PATCH v6] block: loop: avoiding too many pending per work I/O

[Christoph Hellwig]

On Fri, May 01, 2015 at 11:28:01AM +0800, Ming Lei wrote:
> If there are too many pending per work I/O, too many
> high priority work thread can be generated so that
> system performance can be effected.
> 
> This patch limits the max pending per work I/O as 16,
> and will fackback to single queue mode when the max
> number is reached.

Why would you do this fall back?  Shouldn't we just communicate
a concurrency limit to the workqueue code?

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