linux-kernel - Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks

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Message-ID: <51AA5950.6050603@goop.org>
Date:	Sat, 01 Jun 2013 13:28:00 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	gleb@...hat.com, mingo@...hat.com, x86@...nel.org,
	konrad.wilk@...cle.com, hpa@...or.com, pbonzini@...hat.com,
	linux-doc@...r.kernel.org, habanero@...ux.vnet.ibm.com,
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	riel@...hat.com, drjones@...hat.com,
	virtualization@...ts.linux-foundation.org,
	srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V9 0/19] Paravirtualized ticket spinlocks

On 06/01/2013 01:14 PM, Andi Kleen wrote:
> FWIW I use the paravirt spinlock ops for adding lock elision
> to the spinlocks.

Does lock elision still use the ticketlock algorithm/structure, or are
they different?  If they're still basically ticketlocks, then it seems
to me that they're complimentary - hle handles the fastpath, and pv the
slowpath.

> This needs to be done at the top level (so the level you're removing)
>
> However I don't like the pv mechanism very much and would 
> be fine with using an static key hook in the main path
> like I do for all the other lock types.

Right.

    J
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