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Shutemov\"" , Ryan Roberts , =?utf-8?q?=22Michal_Koutn=C3=BD=22?= , Roman Gushchin , "\"Zach O'Keefe\"" , Hugh Dickins , Mcgrof Chamberlain , Andrew Morton , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, gost.dev@samsung.com Subject: Re: [PATCH v4 0/7] Split a folio to any lower order folios Date: Fri, 16 Feb 2024 10:51:52 -0500 X-Mailer: MailMate (1.14r6018) Message-ID: In-Reply-To: References: <20240213215520.1048625-1-zi.yan@sent.com> Content-Type: multipart/signed; boundary="=_MailMate_61B88F8B-B1FF-481E-83FF-9A4C849C0026_="; micalg=pgp-sha512; protocol="application/pgp-signature" X-ClientProxiedBy: MN2PR05CA0004.namprd05.prod.outlook.com (2603:10b6:208:c0::17) To DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB5744:EE_|CH2PR12MB4924:EE_ X-MS-Office365-Filtering-Correlation-Id: 7814e7e5-9031-4c34-07a2-08dc2f073309 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Currently, split_huge_page(= ) >> only splits a huge page to order-0 pages, but splitting to orders high= er than >> 0 is going to better utilize large folios. In addition, Large Block >> Sizes in XFS support would benefit from it[2]. This patchset adds supp= ort for >> splitting a large folio to any lower order folios and uses it during f= ile >> folio truncate operations. > > I added your patches on top of my patches, but removed patch 6 and I > added this instead: > > diff --git a/mm/truncate.c b/mm/truncate.c > index 725b150e47ac..dd07e2e327a8 100644 > --- a/mm/truncate.c > +++ b/mm/truncate.c > @@ -239,7 +239,8 @@ bool truncate_inode_partial_folio(struct folio *fol= io, loff_t start, loff_t end) > folio_invalidate(folio, offset, length); > if (!folio_test_large(folio)) > return true; > - if (split_folio(folio) =3D=3D 0) > + if (split_folio_to_order(folio, > + mapping_min_folio_order(folio->mapping= )) =3D=3D 0) > return true; > if (folio_test_dirty(folio)) > return false; > > I ran genric/476 fstest[1] with SOAK_DURATION set to 360 seconds. This > test uses fstress to do a lot of writes, truncate operations, etc. I ra= n > this on XFS with **64k block size on a 4k page size system**. > > I recorded the vm event for split page and this was the result I got: > > Before your patches: > root@debian:~/xfstests# cat /proc/vmstat | grep split > thp_split_page 0 > thp_split_page_failed 5819 > > After your patches: > root@debian:~/xfstests# cat /proc/vmstat | grep split > thp_split_page 5846 > thp_split_page_failed 20 > > Your patch series definitely helps with splitting the folios while stil= l > maintaining the min_folio_order that LBS requires. Sounds great! Thanks for testing. > > We are still discussing how to quantify this benefit in terms of some > metric with this support. If you have some ideas here, let me know. =46rom my understanding, the benefit will come from that page cache folio= size is bigger with LBS (plus this patchset) after truncate. I assume any= benchmark testing read/write throughput after truncate operations might be helpful. > > I will run the whole xfstests tonight to check for any regressions. Can you use the update patches from: https://github.com/x-y-z/linux-1gb-t= hp/tree/split_thp_to_any_order_v5-mm-everything-2024-02-16-01-35? It cont= ains changes and fixes based on the feedback from this version. I am planning to send this new version out soon. > > -- > Pankaj > > [1] https://github.com/kdave/xfstests/blob/master/tests/generic/476 -- Best Regards, Yan, Zi --=_MailMate_61B88F8B-B1FF-481E-83FF-9A4C849C0026_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmXPhJgPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUmq8QAKb3dKOgG+uj8lhjo6HbqJgfHp8EeYYLdDQz UBCwDNUyMsJYQzi8vXU/fSlGNSwStny4HAREd0nEnKiFL8Rkc/22I+XILurZcs1U AO4imaN3qvjvDT7U0Sa9lkPS37MIF2e6V3IgofIybrBeg1GUZExvQsdSFAsJnfqe qRlSc9CIG3ZtZ5cPkGxrRPKVAA7opAhKrd0L1ZfZSej+1gy/RXix5wTP9GpEU+PD 91Sq3iizVx1MK5FcTihZVS+JYqwV+tGcSm6/b3xQWkZe/cdIcr/x1t7GU3PIKgDa al4xivQrbCkV3ahlhciHYAZqkSqew1iygED4t/cAtQFdwnIgVFIcLXKOQh/eR5Ib ekdd9qR+Lqgg0q5k1DcYRsEsZcYdP6AI3LI6Mu5cRcsvR3l/xGlb/cnNYgLOFExo quU4Mn0Yr8M6E30AX18FtmNA5Uv7La3mmHiFl+Km9heVFQFhd/hrATFxl0gXzmxI 1c0fJ5oYygZCAes3zbcuwaWq4LnSw/gtO9oyfSiVLGYYFIK3BOyEe1PPqfoHaOVV a3/efcY/YjI8yUYfPIXMBSAMGfNwYOsL3xSLgZzvoKCYFq9/H2zThEjdu5bxb9rR Ms2TkO+/ROYiiCQR2ac5iZEjwrrkoWan/T6dfyxnKCNnTPrsCMycFPQO5NI6OAPP 2Argdp27 =DS5m -----END PGP SIGNATURE----- --=_MailMate_61B88F8B-B1FF-481E-83FF-9A4C849C0026_=--