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Sun, 12 Feb 2023 09:55:00 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78F95C433EF; Sun, 12 Feb 2023 09:54:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1676195699; bh=VlJr4rZihpfcfqoU6zpWd33xnk4loe0lCeIMnSn8rvo=; h=From:To:Cc:Subject:Date:From; b=dfK5ZC7vMkNsPz+v77KRRdJ8E6ysa55bt2yVD1d5zP6J+QtDRXt47k6f59+HOUZKR fxKr3niqZzYzXQSByxqo6K7jnMJWyMbWVd0woLXmQdUIhXu6r5zmWadN1NOpNAr2P9 //5+wYaMMGHca8Hdsp717dUj/VnKnDd4wWBw1mtMSfVxPHwyQFdbKkPLVJeDextKO1 Cvb0tfqYmcFPuLgAIrgeWkN9wvdXaKRE9mwvTl6hPhqOpOUW8YoVKqETtp6qoaFv5+ uypxIUhJ1SnMK9xmRqtfmZ1S+a1vkQ5SJyc1PwlEycLTM1bwRfKkpYQzz3wbPQ9Jcg rn+N4y2MZ0tNA== From: Mike Rapoport To: Jonathan Corbet Cc: Andrew Morton , Bagas Sanjaya , David Hildenbrand , Johannes Weiner , Lorenzo Stoakes , "Matthew Wilcox (Oracle)" , Mel Gorman , Michal Hocko , Mike Rapoport , Vlastimil Babka , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2] docs/mm: Physical Memory: add example of interleaving nodes Date: Sun, 12 Feb 2023 11:54:45 +0200 Message-Id: <20230212095445.1311627-1-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 9D18A20003 X-Stat-Signature: xrwojbjk7n5hs581ue53w85fohkkd6ho X-HE-Tag: 1676195701-606789 X-HE-Meta: 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 +UVNn4b7 InPNw6pnxGGb/YMZ+ZSZXzp97fFfwuLYVTuzRvLHW/Z7ExTKeUoAE8wMJUJiUbe7CuPNJst6MgckUHbZtcCOFS0bnNOZd2bW+WApB8sNyzh9gfy0IA9BhYiv0TrQx7oZphLt3sZgAqFYL1J/unFVR+kS2IC6IdpeWmDb3VPGf9WoHdhqWD9beD9EyTZ5olPTjuakvrm4vgrzKNEBqAq4zN4SqJK3TzTEAaa1DOEsMjLxBo8lxAHEnsGIRGlRgnMaFTL8CDTDIi9xyXWJk7qzkXp3MmbgSMSUudvz3YhnAQkfymiSjlBU7sKqTCPMQYIhugI4cubkx0NMjVFSXMGQxoWcbrn7xRcEfslNQ 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: From: "Mike Rapoport (IBM)" Add an example of memory layout with interleaving nodes where even memory banks belong to node 0 and odd memory banks belong to node 1 Suggested-by: Michal Hocko Signed-off-by: Mike Rapoport (IBM) --- v2: * Wording update (Bagas) * Add forgotten Suggested-by v1: https://lore.kernel.org/all/20230211102207.1267058-1-rppt@kernel.org Documentation/mm/physical_memory.rst | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) base-commit: e076f253283c3e55a128fa9665c0e6cd8146948d diff --git a/Documentation/mm/physical_memory.rst b/Documentation/mm/physical_memory.rst index 3f3c02aa6e6e..d14b785fd938 100644 --- a/Documentation/mm/physical_memory.rst +++ b/Documentation/mm/physical_memory.rst @@ -114,6 +114,25 @@ RAM equally split between two nodes, there will be ``ZONE_DMA32``, | DMA32 | NORMAL | MOVABLE | | NORMAL | MOVABLE | +---------+----------+-----------+ +------------+-------------+ + +Note, that memory banks may belong to interleaving nodes. In the example +below an x86 machine has 16Gbytes or RAM in 4 memory banks, even banks +belong to node 0 and odd banks belong to node 1:: + + + 0 4G 8G 12G 16G + +-------------+ +-------------+ +-------------+ +-------------+ + | node 0 | | node 1 | | node 0 | | node 1 | + +-------------+ +-------------+ +-------------+ +-------------+ + + 0 16M 4G + +-----+-------+ +-------------+ +-------------+ +-------------+ + | DMA | DMA32 | | NORMAL | | NORMAL | | NORMAL | + +-----+-------+ +-------------+ +-------------+ +-------------+ + +In such case node 0 will span from 0 to 12 Gbytes and node 1 will span from +4 to 16 Gbytes. + .. _nodes: Nodes