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[209.85.167.43]) by smtp.gmail.com with ESMTPSA id w10sm1716338lfe.107.2020.12.20.10.00.22 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 20 Dec 2020 10:00:23 -0800 (PST) Received: by mail-lf1-f43.google.com with SMTP id m25so18231977lfc.11 for ; Sun, 20 Dec 2020 10:00:22 -0800 (PST) X-Received: by 2002:ac2:41d9:: with SMTP id d25mr4684545lfi.377.1608487222632; Sun, 20 Dec 2020 10:00:22 -0800 (PST) MIME-Version: 1.0 References: <20201220045535.848591-1-npiggin@gmail.com> In-Reply-To: <20201220045535.848591-1-npiggin@gmail.com> From: Linus Torvalds Date: Sun, 20 Dec 2020 10:00:06 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v3 0/3] mm: improve pte updates and dirty/accessed To: Nicholas Piggin Cc: Linux-MM , Bibo Mao 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, Dec 19, 2020 at 8:55 PM Nicholas Piggin wrote: > > Time to get this old series out again. Since last time, Bibo found a > couple of the same cases I did (for MIPS only) which I extend to all > archs, and I dropped the "make the pte dirty if the fork parent was > dirty" due to Linus pointing out a dirty PTE costs more to unmap. It > didn't seem to help a great deal anyway on the access-side fortunately. Looks ok to me. I'm surprised it's all that noticeable, but I don't see anything worrisome in the patches. Linus