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(p200300d82f1a7c004ac1c2c441678a0f.dip0.t-ipconnect.de. [2003:d8:2f1a:7c00:4ac1:c2c4:4167:8a0f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43d0a8d1666sm45451055e9.40.2025.03.13.01.17.41 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Mar 2025 01:17:42 -0700 (PDT) Message-ID: <4e1b5d05-f210-4aaf-a7d2-80458b9f20f9@redhat.com> Date: Thu, 13 Mar 2025 09:17:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 1/5] meminfo: add a per node counter for balloon drivers To: "Michael S. Tsirkin" Cc: Nico Pache , linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, xen-devel@lists.xenproject.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, jerrin.shaji-george@broadcom.com, bcm-kernel-feedback-list@broadcom.com, arnd@arndb.de, gregkh@linuxfoundation.org, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, jgross@suse.com, sstabellini@kernel.org, oleksandr_tyshchenko@epam.com, akpm@linux-foundation.org, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, nphamcs@gmail.com, yosry.ahmed@linux.dev, kanchana.p.sridhar@intel.com, alexander.atanasov@virtuozzo.com References: <20250312000700.184573-1-npache@redhat.com> <20250312000700.184573-2-npache@redhat.com> <20250313032001-mutt-send-email-mst@kernel.org> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Tsirkin wrote: > On Wed, Mar 12, 2025 at 11:19:06PM +0100, David Hildenbrand wrote: >> On 12.03.25 01:06, Nico Pache wrote: >>> Add NR_BALLOON_PAGES counter to track memory used by balloon drivers and >>> expose it through /proc/meminfo and other memory reporting interfaces. >> >> In balloon_page_enqueue_one(), we perform a >> >> __count_vm_event(BALLOON_INFLATE) >> >> and in balloon_page_list_dequeue >> >> __count_vm_event(BALLOON_DEFLATE); >> >> >> Should we maybe simply do the per-node accounting similarly there? > > > BTW should virtio mem be tied into this too, in some way? or is it too > different? No, we should limit it to actual balloon drivers that e.g., never completely remove memory. -- Cheers, David / dhildenb