linux-kernel - Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV

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Message-ID: <20171108084547.GC13350@u40b0340c692b58f6553c.ant.amazon.com>
Date:   Wed, 8 Nov 2017 00:45:47 -0800
From:   Eduardo Valentin <eduval@...zon.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
CC:     Eduardo Valentin <eduval@...zon.com>, <rkrcmar@...hat.com>,
        Matt Wilson <msw@...zon.com>, Jonathan Corbet <corbet@....net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Waiman Long <longman@...hat.com>, <kvm@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Jan H . Schoenherr" <jschoenh@...zon.de>,
        Anthony Liguori <aliguori@...zon.com>
Subject: Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when
 PV_DEDICATED is set

Paolo,

On Tue, Nov 07, 2017 at 01:43:15PM +0100, Paolo Bonzini wrote:
> On 07/11/2017 13:39, Eduardo Valentin wrote:
> >> is this still needed after Waiman's patch to adaptively switch between
> >> tas and pvqspinlock?
> > Can you please point me to it ? Is it already in tip/master?
> > 
> 
> No, he just posted it:
> 
> https://marc.info/?l=linux-kernel&m=150972337909996&w=2

OK, Thanks. I've reviewed his V2. I think the patch to have PV_DEDICATED is still interesting to have,
for the case the guest is in autoselect mode and honors what the host gives as hints.

> 
> Paolo

-- 
All the best,
Eduardo Valentin