linux-kernel - Re: [RFC 01/20] mm/tlb: fix fullmm semantics

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Date:   Sat, 30 Jan 2021 18:57:58 -0800
From:   Andy Lutomirski <luto@...nel.org>
To:     Nadav Amit <nadav.amit@...il.com>
Cc:     Andy Lutomirski <luto@...nel.org>, Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, Yu Zhao <yuzhao@...gle.com>,
        Nick Piggin <npiggin@...il.com>, X86 ML <x86@...nel.org>
Subject: Re: [RFC 01/20] mm/tlb: fix fullmm semantics

On Sat, Jan 30, 2021 at 5:19 PM Nadav Amit <nadav.amit@...il.com> wrote:
>
> > On Jan 30, 2021, at 5:02 PM, Andy Lutomirski <luto@...nel.org> wrote:
> >
> > On Sat, Jan 30, 2021 at 4:16 PM Nadav Amit <nadav.amit@...il.com> wrote:
> >> From: Nadav Amit <namit@...are.com>
> >>
> >> fullmm in mmu_gather is supposed to indicate that the mm is torn-down
> >> (e.g., on process exit) and can therefore allow certain optimizations.
> >> However, tlb_finish_mmu() sets fullmm, when in fact it want to say that
> >> the TLB should be fully flushed.
> >
> > Maybe also rename fullmm?
>
> Possible. How about mm_torn_down?

Sure.  Or mm_exiting, perhaps?

>
> I should have also changed the comment in tlb_finish_mmu().