Re: [PATCH] block: strip out locking optimization input_io_context()

[Tejun Heo]

On Wed, Feb 08, 2012 at 08:49:20AM -0800, Tejun Heo wrote:
> I'm still a bit lost on where the regression is coming from and
> *suspecting* that queue_lock contention is making the reverse locking
> behave much worse than expected, so I mostly wanted to take that out
> and see what happens.

IOW, we can achieve about the same thing by adding another lock in
request_queue.  The goal is using an inner lock for ioc clearing so
that queue_lock doesn't have to be grabbed inside ioc lock.

Thanks.

-- 
tejun
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