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(p200300cbc70718007c1416cc5291a9f3.dip0.t-ipconnect.de. [2003:cb:c707:1800:7c14:16cc:5291:a9f3]) by smtp.gmail.com with ESMTPSA id k13-20020a7bc40d000000b0038e9edf5e73sm1959421wmi.3.2022.04.12.01.18.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 12 Apr 2022 01:18:38 -0700 (PDT) Message-ID: Date: Tue, 12 Apr 2022 10:18:36 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.6.2 Subject: Re: [PATCHv4 8/8] mm/vmstat: Add counter for memory accepting To: "Kirill A. Shutemov" , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel Cc: Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Varad Gautam , Dario Faggioli , Dave Hansen , Brijesh Singh , Mike Rapoport , x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org References: <20220405234343.74045-1-kirill.shutemov@linux.intel.com> <20220405234343.74045-9-kirill.shutemov@linux.intel.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20220405234343.74045-9-kirill.shutemov@linux.intel.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=bPOC9kUJ; spf=none (imf19.hostedemail.com: domain of david@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: yui5939agb739r4mg4xytwk8qjspbu99 X-Rspam-User: X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 080991A0009 X-HE-Tag: 1649751521-180725 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 06.04.22 01:43, Kirill A. Shutemov wrote: > The counter increased every time kernel accepts a memory region. > > The counter allows to see if memory acceptation is still ongoing and > contributes to memory allocation latency. > Does it? See my other mail, can't we have the counter essentially not changing for a long time but still some unaccepted pages sitting at the tail of the freelists that will only get allocated+accepted under real memory pressure? -- Thanks, David / dhildenb