Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set

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Subject: Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 9 Nov 2017 17:17:01 +0100
Cc: Pankaj Gupta <pagupta@xxxxxxxxxx>, Wanpeng Li <kernellwp@xxxxxxxxx>, Eduardo Valentin <eduval@xxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Matt Wilson <msw@xxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, the arch/x86 maintainers <x86@xxxxxxxxxx>, Waiman Long <longman@xxxxxxxxxx>, kvm <kvm@xxxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, "Jan H . Schoenherr" <jschoenh@xxxxxxxxx>, Anthony Liguori <aliguori@xxxxxxxxxx>
In-reply-to: <20171109160536.GE20859@flask>
References: <1509999980-10828-1-git-send-email-eduval@amazon.com> <CANRm+CxfYduv3qW7JNw9Li2V0DYbk5mZ0YL30Akh=eXHgaXigw@mail.gmail.com> <789734192.29237413.1510242805535.JavaMail.zimbra@redhat.com> <20171109160536.GE20859@flask>
User-agent: NeoMutt/20170609 (1.8.3)

On Thu, Nov 09, 2017 at 05:05:36PM +0100, Radim Krcmar wrote:
> 2017-11-09 10:53-0500, Pankaj Gupta:
> > 2] PV TLB should also behave as per option PV_DEDICATED for better performance.
> 
> Right,

Shouldn't KVM do flush_tlb_other() in any case? Not sure how
PV_DEDICATED can help with that.

Follow-Ups:
- Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
  - From: Radim Krcmar
- Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
  - From: Pankaj Gupta

References:
- [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
  - From: Eduardo Valentin
- Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
  - From: Wanpeng Li
- Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
  - From: Pankaj Gupta
- Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
  - From: Radim Krcmar

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