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AJvYcCV8wsGrDy+AJjWA48KAOk31/ch+0g5uHH2a/YVYwqxPOsJsFAyZRY6P69mAQWdmuHjd33TiSiUUyTrLYdez6pkcx2E= X-Gm-Message-State: AOJu0Yz3g93NWtDOC0CFPk00XOee/QsXmQ7mRijNXGErvQHrtTQeF4Zj KVDZgQdRxqugBcesVIet8R3kFFaLj+JytcuW8xm3snCKmYyQbeV279+7kSED+n22KK3SIv0EEo9 0LIHvIqrNh+ypvn2XpBeoXjps5if/q6VWoBqmdA== X-Google-Smtp-Source: AGHT+IH5HYI6/U5oWgLdvGxeY0fpFg8OXqHHr5ZUzkK1XxyJyiWCmyb/BKEtIMTTf0er7LlSWB8J4HGSxys17t9+Qmk= X-Received: by 2002:a81:830a:0:b0:60c:a4b7:139e with SMTP id t10-20020a81830a000000b0060ca4b7139emr13653ywf.16.1710369512263; Wed, 13 Mar 2024 15:38:32 -0700 (PDT) MIME-Version: 1.0 References: <20240220214558.3377482-1-souravpanda@google.com> <20240220214558.3377482-2-souravpanda@google.com> In-Reply-To: From: Pasha Tatashin Date: Wed, 13 Mar 2024 18:37:55 -0400 Message-ID: Subject: Re: [PATCH v9 1/1] mm: report per-page metadata information To: Wei Xu Cc: Sourav Panda , corbet@lwn.net, gregkh@linuxfoundation.org, rafael@kernel.org, akpm@linux-foundation.org, mike.kravetz@oracle.com, muchun.song@linux.dev, rppt@kernel.org, david@redhat.com, rdunlap@infradead.org, chenlinxuan@uniontech.com, yang.yang29@zte.com.cn, tomas.mudrunka@gmail.com, bhelgaas@google.com, ivan@cloudflare.com, yosryahmed@google.com, hannes@cmpxchg.org, shakeelb@google.com, kirill.shutemov@linux.intel.com, wangkefeng.wang@huawei.com, adobriyan@gmail.com, vbabka@suse.cz, Liam.Howlett@oracle.com, surenb@google.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 2AD5EA0019 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: 6tbh99cutsix7mu1e614abqoq85bx3ex X-HE-Tag: 1710369513-362428 X-HE-Meta: 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 EuZpTlAL ww/WC0/MXcYQdh1o7VpL8AD+3F3dgdFSXxrv25UVz2knunzn0uk/L7L8r7GyxEuyfp5BLr7DYdkqVPgfY6yuKIAxjnfB0GWo1X9DBBB4jhySP3FtKG4geV1Dw3t7JRbFxe+SrxF/ocAxWpQwkxZUPtyhlSuYymavjst56SMGuHWgqwyopd4f+aJbdIhTSVbEK1/5YLjGhaYMcvqFg2tbeSgsgpThNmH+eOYaN/pBhWXNMozDxAmhU+KMMmXBNNpUC9KhDoztN25Cb01XWoe5HXKhFTl+A+jFIZGDjqfCUVYiufUkcilv2LeVH6p8VvM5kPxNOOiCbv/2MxEJ3Ln0ahIyIRMBGRBf8Ad9MxganI4AIRj1u+JDiLIMBfc1qFGFpgqOC+pBxjhKZW4YLAiXZ2T9hsA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.001208, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Mon, Feb 26, 2024 at 1:12=E2=80=AFPM Wei Xu wrote: > > On Tue, Feb 20, 2024 at 1:46=E2=80=AFPM Sourav Panda wrote: > > > > Adds two new per-node fields, namely nr_memmap and nr_memmap_boot, > > to /sys/devices/system/node/nodeN/vmstat and a global Memmap field > > to /proc/meminfo. This information can be used by users to see how > > much memory is being used by per-page metadata, which can vary > > depending on build configuration, machine architecture, and system > > use. > > /proc/vmstat also has the system-wide nr_memmap and nr_memmap_boot. > Given that nr_memmap in /proc/vmstat provides the same info (in > different units) as Memmap in /proc/meminfo, it would be better to > remove Memmap from /proc/meminfo to avoid duplication and confusion. There are many items both in meminfo and in vmstat. Given that /proc/meminfo covers all kmem memory, it is beneficial to keep the kmem part of memmap in meminfo as another classification item. Pasha