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

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Message-ID: <a79307f2-e6be-4e59-a74e-16e09ed69e8f@intel.com>
Date: Wed, 13 Aug 2025 07:23:39 -0700
From: Dave Hansen <dave.hansen@...el.com>
To: Wangyang Guo <wangyang.guo@...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, "H. Peter Anvin" <hpa@...or.com>,
 linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Tianyou Li <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 8/12/25 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?