linux-kernel - Re: [PATCH] UV: cpu_relax in uv_wait

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Message-ID: <20090115175735.GH22472@elte.hu>
Date:	Thu, 15 Jan 2009 18:57:35 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Cliff Wickman <cpw@....com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] UV: cpu_relax in uv_wait_completion


* Cliff Wickman <cpw@....com> wrote:

> 
> From: Cliff Wickman <cpw@....com>
> 
> The function uv_wait_completion() spins on reads of a memory-mapped
> register, waiting for completion of BAU hardware replies.
> It should call "cpu_relax()" between those reads to improve performance
> on hyperthreaded configurations.
> 
> Signed-off-by: Cliff Wickman <cpw@....com>
> Acked-by: Jack Steiner <steiner@....org>
> 
> ---
>  arch/x86/kernel/tlb_uv.c |    1 +
>  1 file changed, 1 insertion(+)

applied to tip/x86/urgent, thanks Cliff!

	Ingo
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