linux-kernel - Re: serial percpu_ref draining in exit

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Message-ID: <550B3F58.90109@kernel.dk>
Date:	Thu, 19 Mar 2015 15:27:52 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>, Jeff Moyer <jmoyer@...hat.com>
CC:	kent.overstreet@...il.com, Benjamin LaHaise <bcrl@...ck.org>,
	linux-kernel@...r.kernel.org
Subject: Re: serial percpu_ref draining in exit_aio()

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.

-- 
Jens Axboe

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