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[209.85.208.172]) by smtp.gmail.com with ESMTPSA id a9sm1093611ljb.57.2020.08.22.09.05.53 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 22 Aug 2020 09:05:53 -0700 (PDT) Received: by mail-lj1-f172.google.com with SMTP id v9so5078314ljk.6 for ; Sat, 22 Aug 2020 09:05:53 -0700 (PDT) X-Received: by 2002:a05:651c:503:: with SMTP id o3mr4223772ljp.312.1598112353202; Sat, 22 Aug 2020 09:05:53 -0700 (PDT) MIME-Version: 1.0 References: <20200821234958.7896-1-peterx@redhat.com> In-Reply-To: <20200821234958.7896-1-peterx@redhat.com> From: Linus Torvalds Date: Sat, 22 Aug 2020 09:05:37 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH 0/4] mm: Simplfy cow handling To: Peter Xu Cc: Linux-MM , Linux Kernel Mailing List , "Maya B . Gokhale" , Yang Shi , Marty Mcfadden , Kirill Shutemov , Oleg Nesterov , Jann Horn , Jan Kara , Kirill Tkhai , Andrea Arcangeli , Christoph Hellwig , Andrew Morton Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: CE30D1804A301 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam02 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 Fri, Aug 21, 2020 at 4:50 PM Peter Xu wrote: > > - Run a busy loop dirty program [1] that uses 6G of memory, restrict to 1G > RAM + 5G swap (cgroup). A few hours later, all things still look good. > Make sure to observe (still massive) correct page reuses using the new > counter using the last patch, probably when swapping in. > > - Run umapsort [2] to make sure uffd-wp will work again after applying this > series upon master 5.9-rc1 (5.9-rc1 is broken). I obviously like the diffstat, am wondering if you saw any throughput changes or similar for the busy-loop dirtying thing? Linus