From: Ingo Molnar <mingo@elte.hu>
To: Cliff Wickman <cpw@sgi.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] UV: cpu_relax in uv_wait_completion
Date: Thu, 15 Jan 2009 18:57:35 +0100 [thread overview]
Message-ID: <20090115175735.GH22472@elte.hu> (raw)
In-Reply-To: <E1LNUV6-00025f-Q7@eag09.americas.sgi.com>
* Cliff Wickman <cpw@sgi.com> wrote:
>
> From: Cliff Wickman <cpw@sgi.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@sgi.com>
> Acked-by: Jack Steiner <steiner@sgi.org>
>
> ---
> arch/x86/kernel/tlb_uv.c | 1 +
> 1 file changed, 1 insertion(+)
applied to tip/x86/urgent, thanks Cliff!
Ingo
prev parent reply other threads:[~2009-01-15 17:57 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-15 15:51 Cliff Wickman
2009-01-15 17:57 ` Ingo Molnar [this message]
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