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Re: [Xen-devel] [PATCH v10 12/19] unfair qspinlock: Variable frequency lock stealing mechanism
- To: Waiman Long <Waiman.Long@xxxxxx>
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Thu, 8 May 2014 21:19:44 +0200
- Cc: linux-arch@xxxxxxxxxxxxxxx, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, Scott J Norton <scott.norton@xxxxxx>, x86@xxxxxxxxxx, Paolo Bonzini <paolo.bonzini@xxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, Chegu Vinod <chegu_vinod@xxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- Delivery-date: Thu, 08 May 2014 19:20:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Wed, May 07, 2014 at 11:01:40AM -0400, Waiman Long wrote:
> +#define DEF_LOOP_CNT(c) int c = 0
> +#define INC_LOOP_CNT(c) (c)++
> +#define LOOP_CNT(c) c
> +#define LSTEAL_MIN (1 << 3)
> +#define LSTEAL_MAX (1 << 10)
> +#define LSTEAL_MIN_MASK (LSTEAL_MIN - 1)
> +#define LSTEAL_MAX_MASK (LSTEAL_MAX - 1)
*groan*.. why do you have to write the most obfuscated code ever? We're
not ioccc.org.
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