linux-kernel - Re: [v3 PATCH] mm/memory.c: skip spurious TLB flush for retried page fault

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Message-ID: <20200819082747.GA17345@willie-the-truck>
Date:   Wed, 19 Aug 2020 09:27:47 +0100
From:   Will Deacon <will@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Yang Shi <shy828301@...il.com>, Yu Xu <xuyu@...ux.alibaba.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        stable <stable@...r.kernel.org>
Subject: Re: [v3 PATCH] mm/memory.c: skip spurious TLB flush for retried page
 fault

On Tue, Aug 18, 2020 at 12:01:43PM -0700, Linus Torvalds wrote:
> On Mon, Aug 17, 2020 at 2:04 PM Yang Shi <shy828301@...il.com> wrote:
> >
> > We could just skip the spurious TLB flush to mitigate the regression.
> 
> Ok, this patch I will apply.

Cheers.

> I still hope that arm64 fixes (maybe already fixed) their spurious TLB
> function, and I think we should rename it to make sure everybody
> understands it's local, but in the meantime this patch hides the
> regression and isn't wrong.

I'll look at it for 5.10.

Will