linux-kernel - Re: [PATCH-tip v2 0/2] locking/qrwlock: Improve qrwlock performance

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Message-ID: <20150716155312.GK26390@arm.com>
Date:	Thu, 16 Jul 2015 16:53:12 +0100
From:	Will Deacon <will.deacon@....com>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Scott J Norton <scott.norton@...com>,
	Douglas Hatch <doug.hatch@...com>
Subject: Re: [PATCH-tip v2 0/2] locking/qrwlock: Improve qrwlock performance

Hi Waiman,

On Thu, Jul 09, 2015 at 05:32:21PM +0100, Waiman Long wrote:
> v1->v2:
>  - Take out patch 1 which had been merged to tip.
>  - Take out patch 4 as the change may impact light load performance
>  - Rebased to the latest tip branch
> 
> In converting some existing spinlocks to rwlock, it was found that
> the write lock slowpath performance isn't as good as the qspinlock.
> This patch series tries to improve qrwlock performance to close the
> gap between qspinlock and qrwlock.
> 
> With this patch series in place, we can start converting some spinlocks
> back to rwlocks where it makes sense and the lock size increase isn't
> a concern.

Both of these patches look fine to me:

  Acked-by: Will Deacon <will.deacon@....com>

Cheers,

Will
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