On 03/19/2015 03:27 PM, Jens Axboe wrote:
> On 03/19/2015 03:00 PM, Tejun Heo wrote:
>> On Thu, Mar 19, 2015 at 04:58:33PM -0400, Jeff Moyer wrote:
>>> Do you really want to do memory allocation in the exit path?  That
>>> sounds like a bad idea to me.  (Of course, now you're going to point out
>>> all the places that currently happens, right?  ;-)
>>
>> I think we just need a counter there - let everyone count down as they
>> exit and the last one trigger the completion, no?
>
> Yeah that's a good point, that'd be cleaner too. I'll change it and test
> that.

Here's a cleaner variant that pairs the completion even with an atomic 
count. Works for me as well.

-- 
Jens Axboe