linux-kernel - Re: mm: delay rmap removal until after TLB flush

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Message-Id: <20221106151416.bc2f942f237de31b6c577e70@linux-foundation.org>
Date:   Sun, 6 Nov 2022 15:14:16 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Hugh Dickins <hughd@...gle.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will@...nel.org>,
        Aneesh Kumar <aneesh.kumar@...ux.ibm.com>,
        Nick Piggin <npiggin@...il.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Jann Horn <jannh@...gle.com>,
        John Hubbard <jhubbard@...dia.com>, X86 ML <x86@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Joerg Roedel <jroedel@...e.de>,
        Uros Bizjak <ubizjak@...il.com>,
        Alistair Popple <apopple@...dia.com>,
        linux-arch <linux-arch@...r.kernel.org>
Subject: Re: mm: delay rmap removal until after TLB flush

On Sun, 6 Nov 2022 14:34:51 -0800 Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> > mm-unstable (bad)
> > -----------------
> > Aside from that PageAnon issue, mm-unstable is in an understandably bad
> > state because you could not have foreseen my subpages_mapcount addition
> > to page_remove_rmap().  page_zap_pte_rmap() now needs to handle the
> > PageCompound (but not the "compound") case too.  I rushed you and akpm
> > an emergency patch for that on Friday night, but you, let's say, had
> > reservations about it.  So I haven't posted it, and while the PageAnon
> > issue remains, I think your patchset has to be removed from mm-unstable
> > and linux-next anyway.
> 
> So I think I'm fine with your patch, I just want to move the memcg
> accounting to outside of it.
> 
> I can re-do my series on top of mm-unstable, I guess. That's probably
> the easiest way to handle this all.
> 
> Andrew - can you remove those patches again, and I'll create a new
> series for you?

Yes, I've removed both serieses and shall push the tree out within half
an hour from now.