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[70.77.221.9]) by smtp.gmail.com with ESMTPSA id d20sm9709256pfu.36.2021.08.28.12.27.30 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 28 Aug 2021 12:27:31 -0700 (PDT) From: Andreas Dilger Message-Id: <1FC3646C-259F-4AA4-B7E0-B13E19EDC595@dilger.ca> Content-Type: multipart/signed; boundary="Apple-Mail=_6AEDCF03-E4CC-4258-B9ED-99A286279AC7"; protocol="application/pgp-signature"; micalg=pgp-sha256 Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: Discontiguous folios/pagesets Date: Sat, 28 Aug 2021 13:27:29 -0600 In-Reply-To: Cc: Johannes Weiner , "Darrick J. Wong" , linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org To: Matthew Wilcox References: X-Mailer: Apple Mail (2.3273) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=dilger-ca.20150623.gappssmtp.com header.s=20150623 header.b=ANdSm2CK; dmarc=none; spf=pass (imf04.hostedemail.com: domain of adilger@dilger.ca designates 209.85.215.173 as permitted sender) smtp.mailfrom=adilger@dilger.ca X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 1CE9C5000097 X-Stat-Signature: m3oxwbs5kikuugs47xgfydubn1okocc9 X-HE-Tag: 1630178853-74315 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: --Apple-Mail=_6AEDCF03-E4CC-4258-B9ED-99A286279AC7 Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset=us-ascii On Aug 28, 2021, at 1:04 PM, Matthew Wilcox wrote: > > The current folio work is focused on permitting the VM to use > physically contiguous chunks of memory. Both Darrick and Johannes > have pointed out the advantages of supporting logically-contiguous, > physically-discontiguous chunks of memory. Johannes wants to be able to > use order-0 allocations to allocate larger folios, getting the benefit > of managing the memory in larger chunks without requiring the memory > allocator to be able to find contiguous chunks. Darrick wants to support > non-power-of-two block sizes. What is the use case for non-power-of-two block sizes? The main question is whether that use case is important enough to add the complexity and overhead in order to support it? Cheers, Andreas --Apple-Mail=_6AEDCF03-E4CC-4258-B9ED-99A286279AC7 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIzBAEBCAAdFiEEDb73u6ZejP5ZMprvcqXauRfMH+AFAmEqjiEACgkQcqXauRfM H+Awog/+IxByRyRvXouBeH71ySqebdd49O3ejyn09LUizb6hAPjoVM1KRwcP4URu KOPb2QomhgCHOPLxnbTYDjQW1uZ4pfAK2YeWxF1SA/KpKytIi1Eot4Hb4e0brfIE 2KkaqZ9iwfuNggrsXPZzmTkouCieamt1+mg3iYKJV79pAhI+w71juShXPFi923Ax R2fUnd0yxM7FChMSsgdxQe0akf0O1AXfx6Q8QBpVTUcXKqIiLk06ZLP9L3YCIR3+ KgzEbQQ6Gy3Md65mCikmXHtWJrXtbxrhieYl101o7I+BCwqYg1blxIyVW2dh2d4S lrAulpVuJBbZpzbFuNXls5Z2TES0VG5hOkINEsGUoijryMS+zpo/rH5yyx1/5XAv KzVNBXesMopDDSKSDX7zfogptHpSo08QS/XSEy/d769T6xBAnFqodzIR3/ZsgG5Q VsuJf64BTotqnjz8lFRpsy6cZFbDEkXTScybZiTx0O4izfTzGNV74URoXm0tOKIq Sbfu0M1boO2JWFeNkWH3dA5ndc2/ThwfnH57eFKM+7VFD0cTU1/YTUuMRvEZS/Wl UReUOhwc9l/C1GXsSIRxpVRrdj3E2fxgw3U2tflr/bjpEwWwn2DFQXMlhDJxHWEh /sL4K8hTkMcALxF3NC86ek/bfZYYwe0Xr4GII8zGkk3ASRcCHQ4= =eN/o -----END PGP SIGNATURE----- --Apple-Mail=_6AEDCF03-E4CC-4258-B9ED-99A286279AC7--