From: Jason Low <jason.low2@hp.com>
To: Davidlohr Bueso <davidlohr@hp.com>
Cc: peterz@infradead.org, mingo@kernel.org, aswin@hp.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH -tip/master 5/7] locking/mutex: Use MUTEX_SPIN_ON_OWNER when appropriate
Date: Wed, 30 Jul 2014 08:19:56 -0700 [thread overview]
Message-ID: <1406733596.3544.8.camel@j-VirtualBox> (raw)
In-Reply-To: <1406524724-17946-5-git-send-email-davidlohr@hp.com>
On Sun, 2014-07-27 at 22:18 -0700, Davidlohr Bueso wrote:
> 4badad35 (locking/mutex: Disable optimistic spinning on some
> architectures) added a ARCH_SUPPORTS_ATOMIC_RMW flag to
> disable the mutex optimistic feature on specific archs.
>
> Because CONFIG_MUTEX_SPIN_ON_OWNER only depended on DEBUG and
> SMP, it was ok to have the ->owner field conditional a bit
> flexible. However by adding a new variable to the matter,
> we can waste space with the unused field, ie: CONFIG_SMP &&
> (!CONFIG_MUTEX_SPIN_ON_OWNER && !CONFIG_DEBUG_MUTEX).
>
> Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Acked-by: Jason Low <jason.low2@hp.com>
next prev parent reply other threads:[~2014-07-30 15:20 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-28 5:18 [PATCH -tip/master 1/7] locking/mutex: Unify arguments in lock/unlock slowpaths Davidlohr Bueso
2014-07-28 5:18 ` [PATCH -tip/master 2/7] locking/mutex: Document quick lock release when unlocking Davidlohr Bueso
2014-07-30 15:10 ` Jason Low
2014-07-30 18:20 ` Davidlohr Bueso
2014-07-28 5:18 ` [PATCH -tip/master 3/7] locking/mcs: Remove obsolete comment Davidlohr Bueso
2014-07-28 16:49 ` Jason Low
2014-07-28 16:53 ` Davidlohr Bueso
2014-07-28 16:57 ` Peter Zijlstra
2014-07-28 17:19 ` Jason Low
2014-07-28 16:54 ` Peter Zijlstra
2014-07-28 17:49 ` Jason Low
2014-07-28 18:50 ` Peter Zijlstra
2014-07-28 21:02 ` Jason Low
2014-07-30 15:11 ` Jason Low
2014-07-28 5:18 ` [PATCH -tip/master 4/7] locking/mutex: Refactor optimistic spinning code Davidlohr Bueso
2014-07-28 9:08 ` Peter Zijlstra
2014-07-28 16:39 ` Jason Low
2014-07-28 16:41 ` Davidlohr Bueso
2014-07-29 2:55 ` [PATCH -tip/master v2] " Davidlohr Bueso
2014-07-29 3:41 ` Jason Low
2014-07-29 4:31 ` Davidlohr Bueso
2014-07-29 4:51 ` [PATCH -tip/master v3] " Davidlohr Bueso
2014-07-30 15:18 ` [PATCH -tip/master 4/7] " Jason Low
2014-07-28 5:18 ` [PATCH -tip/master 5/7] locking/mutex: Use MUTEX_SPIN_ON_OWNER when appropriate Davidlohr Bueso
2014-07-30 15:19 ` Jason Low [this message]
2014-07-28 5:18 ` [PATCH 6/7] locking: Move docs into Documentation/locking/ Davidlohr Bueso
2014-07-28 5:18 ` [PATCH -tip/master 7/7] Documentation: Update locking/mutex-design.txt disadvantages Davidlohr Bueso
2014-07-28 18:09 ` Jason Low
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