linux-kernel - Re: [PATCH 1/1] prefetch result for ARM64 atomic ops

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Message-ID: <1397498661.2962.5.camel@joe-AO722>
Date:	Mon, 14 Apr 2014 11:04:21 -0700
From:	Joe Perches <joe@...ches.com>
To:	Pranith Kumar <bobby.prani@...il.com>
Cc:	catalin.marinas@....com, will.deacon@....com,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] prefetch result for ARM64 atomic ops

On Mon, 2014-04-14 at 13:55 -0400, Pranith Kumar wrote:

Are there some benchmark comparison results
you neglected to attach?

> diff --git a/arch/arm64/include/asm/atomic.h b/arch/arm64/include/asm/atomic.h
[]
> @@ -235,6 +244,7 @@ static inline long atomic64_cmpxchg(atomic64_t
> *ptr, long old, long new)
>      unsigned long res;
> 
>      smp_mb();
> +    prefetchw(&v->counter);

Does this compile?


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