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[62.83.84.125]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42122299300sm26362175e9.42.2024.05.29.03.09.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 May 2024 03:09:58 -0700 (PDT) From: Oscar Salvador X-Google-Original-From: Oscar Salvador Date: Wed, 29 May 2024 12:09:56 +0200 To: Christophe Leroy Cc: Oscar Salvador , Andrew Morton , Jason Gunthorpe , Peter Xu , Michael Ellerman , Nicholas Piggin , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "linuxppc-dev@lists.ozlabs.org" Subject: Re: [RFC PATCH v4 12/16] powerpc/e500: Encode hugepage size in PTE bits Message-ID: References: <10eae3c6815e3aba5f624af92321948e4684c95a.1716815901.git.christophe.leroy@csgroup.eu> <3cf95f5e-cc8b-4417-a3fa-80dc3b24ac63@csgroup.eu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3cf95f5e-cc8b-4417-a3fa-80dc3b24ac63@csgroup.eu> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 03B771C0017 X-Stat-Signature: jqi5jupg73rifnaa6e5cjob75e91o8wk X-Rspam-User: X-HE-Tag: 1716977399-962829 X-HE-Meta: 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 JGmd/Naw gkK+wgc7QiBJGDPuwp6joBBiUX7lNNeGAWyduzy5dudlT52lIpECS4zo2RV2OnXLb7xKQ2fcI7AZCR14Ysv9/og1UZe3V2rjRD8saUOTUBcEq13UlaLpqE6AK06KeFEgF7XdmtSAutpBoG/F2ejXWh6Ahr2Of8TV64cwqZ0C4apYucSOonSJkJjmXnVhMCHin8ilNE1u2KW7wfAvkANofBvK1/+GJUUXb3r8iE2vQnaazKLdpkT8xqguQux8gi5MTl2AYhvmEZw05xbhtlDRMY/YT1sECjJtaEHW9tS3Cdl/L0KDQYYTnZ2N4xHqgjjjczwPvPDmWLMWX/ZHuVFZyrSmPF7ATieABQOlh X-Bogosity: Ham, tests=bogofilter, spamicity=0.006491, 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 Wed, May 29, 2024 at 09:49:48AM +0000, Christophe Leroy wrote: > Doesn't really matter if it's PUD or PMD at this point. On a 32 bits > kernel it will be all PMD while on a 64 bits kernel it is both PMD and PUD. > > At the time being (as implemented with hugepd), Linux support 4M, 16M, > 64M, 256M and 1G (Shifts 22, 24, 26, 28, 30) > > The hardware supports the following page sizes, and encodes them on 4 > bits allthough it is not directly a shift. Maybe it would be better to > use that encoding after all: I think so. > > 0001 4 Kbytes (Shift 12) > 0010 16 Kbytes (Shift 14) > 0011 64 Kbytes (Shift 16) > 0100 256 Kbytes (Shift 18) > 0101 1 Mbyte (Shift 20) > 0110 4 Mbytes (Shift 22) > 0111 16 Mbytes (Shift 24) > 1000 64 Mbytes (Shift 26) > 1001 256 Mbytes (Shift 28) > 1010 1 Gbyte (e500v2 only) (Shift 30) > 1011 4 Gbytes (e500v2 only) (Shift 32) You say hugehages start at 2MB (shift 21), but you say that the smallest hugepage Linux support is 4MB (shift 22).? -- Oscar Salvador SUSE Labs