Re: [patch]block: fix ioc locking warning

From: Tejun Heo
Date: Mon Feb 06 2012 - 12:27:12 EST


On Mon, Feb 06, 2012 at 08:58:49AM -0800, Linus Torvalds wrote:
> On Mon, Feb 6, 2012 at 8:44 AM, Tejun Heo <tj@xxxxxxxxxx> wrote:
> >
> > Yeah, this seems better to me.  Jens, if you're gonna amend the
> > commit, please consider collapsing the following patch into the
> > original patch too.  Thanks.
> Guys, is it *really* worth it to do all these crazy games?
> How bad is it to just always use the async freeing, instead of this
> clearly very fragile crazy direct-freeing-with-serious-locking-issues
> thing?

It's one wq scheduling on exit for any task which has issued an IO. I
don't think it would matter except for task fork/exit microbenchs (or
workloads which approximate to that). I'll get some measurements and
strip the optimization if it doesn't really show up.


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