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[209.85.208.170]) by smtp.gmail.com with ESMTPSA id c3sm1509201lfh.82.2021.06.14.07.58.23 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 14 Jun 2021 07:58:23 -0700 (PDT) Received: by mail-lj1-f170.google.com with SMTP id r16so20567330ljk.9 for ; Mon, 14 Jun 2021 07:58:23 -0700 (PDT) X-Received: by 2002:a2e:a549:: with SMTP id e9mr2705701ljn.411.1623682703202; Mon, 14 Jun 2021 07:58:23 -0700 (PDT) MIME-Version: 1.0 References: <20210607055131.156184-3-aneesh.kumar@linux.ibm.com> <20210614145536.GB28801@xsang-OptiPlex-9020> In-Reply-To: <20210614145536.GB28801@xsang-OptiPlex-9020> From: Linus Torvalds Date: Mon, 14 Jun 2021 07:58:07 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [mm/mremap] ecf8443e51: vm-scalability.throughput -29.4% regression To: kernel test robot Cc: "Aneesh Kumar K.V" , 0day robot , LKML , lkp@lists.01.org, "Huang, Ying" , Feng Tang , Zhengjun Xing , Linux-MM , Andrew Morton , Michael Ellerman , linuxppc-dev , Kalesh Singh , Nick Piggin , Joel Fernandes , Christophe Leroy , "Kirill A . Shutemov" Content-Type: text/plain; charset="UTF-8" Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=WFXINDqa; spf=pass (imf04.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.167.43 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org; dmarc=none X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 650A5420 X-Stat-Signature: skr9qy46qucsw8taxmwowp6xowr7gbrn X-HE-Tag: 1623682701-787188 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 Mon, Jun 14, 2021 at 7:39 AM kernel test robot wrote: > > FYI, we noticed a -29.4% regression of vm-scalability.throughput due to commit: > ecf8443e51a8 ("[PATCH v7 02/11] mm/mremap: Fix race between MOVE_PUD mremap and pageout") Ouch. I guess it's not a huge surprise, but that's a fairly large regression. Probably because the pud lock is just one single lock ("No scalability reason to split PUD locks yet"). What happens if pud_lockptr() were to do the same thing that pmd_lockptr() does? Linus