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Mon, 13 May 2024 10:12:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id L2CkMaHnQWaKUAAAD6G6ig (envelope-from ); Mon, 13 May 2024 10:12:49 +0000 Date: Mon, 13 May 2024 12:12:44 +0200 From: Oscar Salvador To: Matthew Wilcox Cc: lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org Subject: Re: [LSF/MM/BFP TOPIC] Deprecate SPARSEMEM and have only SPARSEMEM_VMEMMAP Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Action: no action X-Rspamd-Queue-Id: D3C964001C X-Stat-Signature: ujaz7d49zq94jqmqaczpn15gnrrfow9n X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1715595171-302855 X-HE-Meta: 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 SjlwZHW1 j1mJZlZI7212/vKWQTpUdEhKP7z2ovDQ58QpJ2FwmFYMUpEHqIHJXMKb2f35Nf6VkTeztGHMI9LXBXbqL/ZvdLz9JkNXjVL+HUOOQcigVFPqBRUjlau8JTMjrsQrnC5jW7jIBROZVFciaeAGgTigUsEkL2SC2v0nQruRth9RLWJ6SdgIkUVR7Zszxn9BILFi6x/s4Q6zUhsh4HlL0ks7oOlBGj/fezEYLISfszjPvCwoy5skLxvNNwF0iKeFEoZSoy8lI X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, 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, May 13, 2024 at 11:43:09AM +0200, Oscar Salvador wrote: > 0-3GB -> 0 .. 23 section (memmap populated) > 4-32GB -> 31 .. 255 section (memmap populated) > 259-260GB -> 2071 .. 2079 section (memmap populated) And just to add more info, considering a 128MB section granularity (which seems to be what paric has) a PAGE_SIZE of 4KB (not really sure which page size parisc can deal with), PAGES_PER_SECTION then being 32768 and the vmemmap range starting at 0xffffea0000000000, we would have the following vmemmap layout: 0-3GB -> 0xffffea0000000000 - 0xffffea0003000000 4-32GB -> 0xffffea0004000000 - 0xffffea0007800000 259-260GB -> 0xffffea0023e00000 - 0xffffea0024e00000 I am not sure though whether we can hit any limitation when it comes to the vmemmap space we have available. -- Oscar Salvador SUSE Labs