linux-kernel - Re: [PATCH RESEND] x86: Avoid contention on cpa

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Message-ID: <20120602185657.GB15595@WorkStation.localnet>
Date:	Sat, 2 Jun 2012 21:56:57 +0300
From:	Ido Yariv <ido@...ery.com>
To:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>
Cc:	Shai Fultheim <shai@...lemp.com>
Subject: Re: [PATCH RESEND] x86: Avoid contention on cpa_lock if possible

On Fri, Apr 20, 2012 at 01:11:32AM +0300, Ido Yariv wrote:
> From: Shai Fultheim <shai@...lemp.com>
> 
> Some architectures (e.g. vSMP) do not require to serialize cpa, for
> instance, by guaranteeing that the most recent TLB entry will always be
> used.
> 
> To avoid needless contention on cpa_lock, do not lock/unlock it on such
> architectures.
> 
> Signed-off-by: Shai Fultheim <shai@...lemp.com>
> [ido@...ery.com: added should_serialize_cpa, handled potential race, and
>                  reworded the commit message]
> Signed-off-by: Ido Yariv <ido@...ery.com>
> ---

Ping?

Thanks,
Ido.
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