linux-kernel - Re: [RFC PATCH] mutex: Apply adaptive spinning on mutex

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Message-ID: <AANLkTik4iG+Ssb+JU3YRB4C11CEZeVozqoiz4rvezFLL@mail.gmail.com>
Date:	Wed, 23 Mar 2011 08:48:01 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: [RFC PATCH] mutex: Apply adaptive spinning on mutex_trylock()

On Wed, Mar 23, 2011 at 8:37 AM, Tejun Heo <tj@...nel.org> 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.

So no objections from me.

                    Linus
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