linux-kernel - Re: [PATCH] x86,tlb: update mm

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Message-ID: <e25bd94d-b219-414a-ba65-f2003df32597@intel.com>
Date: Fri, 8 Nov 2024 12:46:14 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Rik van Riel <riel@...riel.com>, Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
 kernel-team@...a.com
Subject: Re: [PATCH] x86,tlb: update mm_cpumask lazily

On 11/8/24 11:31, Rik van Riel wrote:
>  		/* Can only happen on remote CPUs */
> -		if (f->mm && f->mm != loaded_mm)
> +		if (f->mm && f->mm != loaded_mm) {
> +			cpumask_clear_cpu(raw_smp_processor_id(), mm_cpumask(f->mm));
>  			return;
> +		}

We could also stick a new flush event type in here that says it received
an IPI for a non-loaded mm to see how common those are.