linux-kernel - RE: [PATCH RESEND^2] x86/paravirt: add backoff mechanism to virt_spin

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Message-ID: <DS0PR11MB80186AF86A0924C8240437C09235A@DS0PR11MB8018.namprd11.prod.outlook.com>
Date: Thu, 14 Aug 2025 01:14:14 +0000
From: "Guo, Wangyang" <wangyang.guo@...el.com>
To: "Hansen, Dave" <dave.hansen@...el.com>, Sean Christopherson
	<seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, Vitaly Kuznetsov
	<vkuznets@...hat.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar
	<mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "H. Peter
 Anvin" <hpa@...or.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC: "Li, Tianyou" <tianyou.li@...el.com>, Tim Chen
	<tim.c.chen@...ux.intel.com>
Subject: RE: [PATCH RESEND^2] x86/paravirt: add backoff mechanism to
 virt_spin_lock

On 8/13/2025 10:23 PM, Dave Hansen wrote:
> On 8/12/25 17:50, Wangyang Guo wrote:
>> The optimization can improves SpecCPU2017 502.gcc_r benchmark by ~4% for
>> 288 cores VM on Intel Xeon 6 E-cores platform.
> 
> Which specific locks are getting contended?

The majority comes from lruvec->lru_lock when doing release_pages.

BR
Wangyang