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[209.85.208.176]) by smtp.gmail.com with ESMTPSA id n7sm1595956ljh.38.2019.09.07.12.55.52 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 07 Sep 2019 12:55:52 -0700 (PDT) Received: by mail-lj1-f176.google.com with SMTP id 7so9038158ljw.7 for ; Sat, 07 Sep 2019 12:55:52 -0700 (PDT) X-Received: by 2002:a2e:814d:: with SMTP id t13mr10346678ljg.72.1567886152153; Sat, 07 Sep 2019 12:55:52 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Sat, 7 Sep 2019 12:55:36 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [patch for-5.3 0/4] revert immediate fallback to remote hugepages To: David Rientjes Cc: Andrew Morton , Andrea Arcangeli , Michal Hocko , Mel Gorman , Vlastimil Babka , "Kirill A. Shutemov" , Linux List Kernel Mailing , Linux-MM Content-Type: text/plain; charset="UTF-8" X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Sat, Sep 7, 2019 at 12:51 PM David Rientjes wrote: > > Andrea acknowledges the swap storm that he reported would be fixed with > the last two patches in this series The problem is that even you aren't arguing that those patches should go into 5.3. So those fixes aren't going in, so "the swap storms would be fixed" argument isn't actually an argument at all as far as 5.3 is concerned. End result: we'd have the qemu-kvm instance performance problem in 5.3 that apparently causes distros to apply those patches that you want to revert anyway. So reverting would just make distros not use 5.3 in that form. So I don't think we can revert those again without applying the two patches in the series. So it would be a 5.4 merge window operation. Linus