Re: [RFC PATCH] mutex: Apply adaptive spinning on mutex_trylock()

From: Tejun Heo
Date: Wed Mar 23 2011 - 11:52:15 EST

On Wed, Mar 23, 2011 at 08:48:01AM -0700, Linus Torvalds wrote:
> On Wed, Mar 23, 2011 at 8:37 AM, Tejun Heo <tj@xxxxxxxxxx> wrote:
> >
> > Currently, mutex_trylock() doesn't use adaptive spinning.  It tries
> > just once.  I got curious whether using adaptive spinning on
> > mutex_trylock() would be beneficial and it seems so, at least for
> > btrfs anyway.
> Hmm. Seems reasonable to me. The patch looks clean, although part of
> that is just the mutex_spin() cleanup that is independent of actually
> using it in trylock.

Oh, I have two split patches. Posted the combined one for comments.

> So no objections from me.

Awesome. Peter, what do you think? Are there some other tests which
can be useful?


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