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(p200300cbc7048f009219ab4c826e9646.dip0.t-ipconnect.de. [2003:cb:c704:8f00:9219:ab4c:826e:9646]) by smtp.gmail.com with ESMTPSA id y3-20020a7bcd83000000b003b492753826sm2038178wmj.43.2022.10.14.06.40.10 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 14 Oct 2022 06:40:11 -0700 (PDT) Message-ID: <7e6f2d09-e5cf-7f8d-965d-a39bfb0ea286@redhat.com> Date: Fri, 14 Oct 2022 15:40:10 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.3.1 Subject: Re: RFC [PATCH v4 2/7] Enable balloon drivers to report inflated memory To: Alexander Atanasov , Nadav Amit Cc: "Michael S. Tsirkin" , Andrew Morton , kernel@openvz.org, Linux Virtualization , LKML , Linux MM References: <20221005090158.2801592-1-alexander.atanasov@virtuozzo.com> <20221005090158.2801592-3-alexander.atanasov@virtuozzo.com> <88EDC41D-408F-4ADF-A933-0A6F36E5F262@gmail.com> <42C75E59-696B-41D5-BD77-68EFF0B075C6@gmail.com> <71E14334-CA3B-45FB-A854-7A8D6649C798@gmail.com> <1118F098-972A-4F58-8EE1-270A06E4F9D1@gmail.com> <7ba328e5-3bc8-cb22-f00c-eddb8aea9a06@virtuozzo.com> <063efd58-8373-90ea-7c5e-9d0e9161d2ba@redhat.com> <04e5a2e4-052d-0f80-d642-4e104307f38b@virtuozzo.com> <72e535ce-80eb-a02f-970c-6a9c80da0a24@redhat.com> <5b1e0a13-8018-630d-d512-c3033db2f2e3@virtuozzo.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <5b1e0a13-8018-630d-d512-c3033db2f2e3@virtuozzo.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1665754815; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=97+yCsen+aZv3dzNcLFg5QyETWduzN4OK7Pj/5FTDqQ=; b=gKjdYsr2QKzzgOGkCSGl6qkD1Y0x65MxxIc3Rw+7ItNXgaW1JtSKtoXmhV7ChuOxqCAQHM s76nJ7v6lemXUPqdQby+LGkM99ez+h2QVuDL6aGhMstwgWVtvLxJuQnfDHUgkyHy0/n9Ir LiWltpO2BNv3xO7hP9+1hQ0hs54DytE= ARC-Authentication-Results: i=1; imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=MWTxrli7; spf=pass (imf01.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1665754815; a=rsa-sha256; cv=none; b=vZk42melMMHMSs4sZ4zQdEADUUa7r0F7Z/3ljhqkxHrQsrNumuLHSoLc/5VCbvyxkgDWIy DT0I+ImqFvtT4htPvTecYg4pnac8u3yr3AHEVnlzRrFn+WL2839Tn8mAWXRoMuwaxvId+j 6nKj/TB3vLYLfpD9y+/GnyMzBxjkQrs= X-Stat-Signature: 5ojx158jkdu5oiq3a8cfxtmfrxxkjuqk X-Rspamd-Queue-Id: 0BCB240042 Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=MWTxrli7; spf=pass (imf01.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1665754814-964688 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: >>> >>> Other problem is that there are drivers that do not use >>> adjust_managed_page_count(). >> >> Which ones? Do we care? > > VMWare and Virtio balloon drivers. I recently proposed to unify them and > the objection was that it would break existing users - which is valid so > we must care i guess. I'm confused, I think we care about actual adjustment of the total pages available here, that we want to notify the system about. These approaches (vmware, virtio-balloon with deflate-on-oom) don't adjust totalpages, because the assumption is that we can get back the inflated memory any time we really need it automatically. -- Thanks, David / dhildenb