[RFC] distinguish foreground and background IOs in block throttle

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Hi all,

Cgroup writeback is supported since v4.2. I found there exists a
problem in the following case.

A cgroup may send both buffer and direct/sync IOs. The foreground
thread will be stalled when periodic writeback IOs is flushed because
the service queue already has a plenty of writeback IOs, then
foreground IOs should be enqueued with its FIFO policy.

I wonder if we can distinguish foreground and background IOs in block
throttle to fix the above problem.

Any suggestion are always appreciated.


Thanks,
Jiufei
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