linux-kernel - Re: [PATCH v2] x86/mm/tlb: ignore f->new_tlb

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Message-ID: <7672923F-D439-4867-9418-B1F44EE5CC44@vmware.com>
Date:   Mon, 11 Jul 2022 17:39:37 +0000
From:   Nadav Amit <namit@...are.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
CC:     LKML <linux-kernel@...r.kernel.org>,
        Hugh Dickins <hughd@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        X86 ML <x86@...nel.org>, Linux MM <linux-mm@...ck.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Nadav Amit <nadav.amit@...il.com>
Subject: Re: [PATCH v2] x86/mm/tlb: ignore f->new_tlb_gen when zero

On Jul 10, 2022, at 4:28 PM, Nadav Amit <nadav.amit@...il.com> wrote:

> From: Nadav Amit <namit@...are.com>
> 
> Commit aa44284960d5 ("x86/mm/tlb: Avoid reading mm_tlb_gen when
> possible") introduced an optimization of skipping the flush if the TLB
> generation that is flushed (as provided in flush_tlb_info) was already
> flushed.

Dave,

Can you please review this patch today?

I feel bad (for a good reason) for breaking swap/migration.

Thanks,
Nadav