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

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Message-ID: <CANtih+9byBuPQpsdRnAh3e8xH1QDz_8SxAC7sSv=-hSdaFQL8Q@mail.gmail.com>
Date:	Sun, 6 May 2012 02:49:10 +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>, Ido Yariv <ido@...ery.com>
Subject: Re: [PATCH RESEND] x86: Avoid contention on cpa_lock if possible

On Fri, Apr 20, 2012 at 1:11 AM, Ido Yariv <ido@...ery.com> 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>
> ---

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