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

From: Tejun Heo
Date: Tue Feb 07 2012 - 11:22:59 EST

Hello, Jens.

On Tue, Feb 07, 2012 at 07:49:19AM +0100, Jens Axboe wrote:
> > I couldn't find any statiscally meaningful advantage of the
> > optimization with tight fork/exit tests w/ forced ioc creation on
> > fork, which gotta be the most pathological test case for the code
> > path. So, let's remove the ugly optimization. If I missed sth, we
> > can resurrect the simpler optimization later. Jens, this is on top of
> > linus#master without Shaohua's patch.
> OK, then I'm fine with cleaning it up. Applied, thanks Tejun.

Hmmm... how about merging Shaohua's smaller fix first until we figure
out what's going on with the performance regression he's seeing?


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