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Shutemov" , Ryan Roberts , =?utf-8?q?Michal_Koutn=C3=BD?= , Roman Gushchin , "Zach O'Keefe" , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v3 0/7] Split a folio to any lower order folios Date: Tue, 18 Apr 2023 10:00:43 -0400 X-Mailer: MailMate (1.14r5963) Message-ID: <9AA686F5-5366-4F41-92A7-C18B77BFDD6E@nvidia.com> In-Reply-To: References: <20230403201839.4097845-1-zi.yan@sent.com> <20230404144727.e613116684dbd65a4b4745c1@linux-foundation.org> <49ee481e-452f-61c7-2da5-28de2cf3de2@google.com> <8B784026-7C90-427D-91E2-2D551FA576D7@nvidia.com> Content-Type: multipart/signed; boundary="=_MailMate_7EF800F6-588F-4AE4-909D-5775F8A02B83_="; micalg=pgp-sha512; protocol="application/pgp-signature" X-ClientProxiedBy: BLAPR03CA0144.namprd03.prod.outlook.com (2603:10b6:208:32e::29) To DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email 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 F5XBbsaQ 19xUl0dCROd8FP7gEEEaM4Bp/Wrahm1sPbVOvSWewxJYAPY46C7tTNwuqMPIt87sgGCdG1QoBcForhJakkfTvddOsmqhZS+CJ9gSoa6JXJMsX+hA+8X8sdAzEJkl0DBaOxgzkeExumy+kU63TFQqWqH8yjiOE6FVzDgBofriAkac+joVShrCf8tvT+ZNq3YWMIT3sah/miYz+9FQZ4rqDeAAu/n32GTF/T5eNlOfirc45JaPPU2k6qi/PUP6+um0rUnhOjO1v56fWIOqxzO0OM1WNuwk4CLMp2yS3cfrQqGAtRQpvmdTcnMhcM7NnrhTmYXm8+qa7kssN5ENIWUUIc35uN/j4/d6BT2GWSMoP3g0TIhh1lRXUtHSDxqL/63yoTvd49hhUdgDzTX/QFv6jypRB45Z7BfsuIS++ 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: --=_MailMate_7EF800F6-588F-4AE4-909D-5775F8A02B83_= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable On 18 Apr 2023, at 6:29, David Hildenbrand wrote: > On 17.04.23 21:26, Zi Yan wrote: >> On 17 Apr 2023, at 10:20, David Hildenbrand wrote: >> >>> On 16.04.23 20:11, Hugh Dickins wrote: >>>> On Tue, 4 Apr 2023, Andrew Morton wrote: >>>>> On Mon, 3 Apr 2023 16:18:32 -0400 Zi Yan wrote: >>>>> >>>>>> File folio supports any order and people would like to support fle= xible orders >>>>>> for anonymous folio[1] too. Currently, split_huge_page() only spli= ts a huge >>>>>> page to order-0 pages, but splitting to orders higher than 0 is al= so useful. >>>>>> This patchset adds support for splitting a huge page to any lower = order pages >>>>>> and uses it during file folio truncate operations. >>>>> >>>>> This series (and its v1 & v2) don't appear to have much in the way = of >>>>> detailed review. As it's at v3 and has been fairly stable I'll que= ue >>>>> it up for some testing now, but I do ask that some reviewers go thr= ough >>>>> it please. >>>> >>>> Andrew, please don't let this series drift into 6.4-rc1. >>>> >>>> I've seen a bug or two (I'll point out in response to those patches)= , >>>> but overall I don't see what the justification for the series is: do= ne >>>> because it could be done, it seems to me, but liable to add surprise= s. >>>> >>>> The cover letter says "splitting to orders higher than 0 is also use= ful", >>>> but it's not clear why; and the infrastructure provided seems unsuit= ed >>>> to the one use provided - I'll say more on that truncation patch. >>> >>> I agree. Maybe this patch set is something we want to have in the fut= ure once actual consumers that can benefit are in place, such that we can= show actual performance numbers with/without. >> >> Ryan is working on large folio for anonymous pages and has shown promi= sing performance >> results[1]. This patchset would avoid getting base pages during split = if possible. >> > Yes, I know. And it would be great to get some actual numbers with/with= out your patches to show that this optimization actually matters in pract= ice. Sure. Will try to add perf numbers in the next version. > > Unrelated, your cover letter mentions "file folio truncate operations."= =2E Would it also apply to FALLOC_FL_PUNCH_HOLE, when partially zapping a= THP? Yes. In the self tests, I have fallocate(fd, FALLOC_FL_PUNCH_HOLE|FALLOC_FL_KEEP_SIZE, offset[j], len[j]= ); and it uses the truncate operation I updated in patch 6. > >>> >>> Until then, "365 insertions(+), 68 deletions(-)" certainly needs some= reasonable motivation. >> >> Come on. 225 out of 365 insertions are self tests code. We need motiva= tion to add >> testing code? > > Well, if you add feature X and the tests target feature X, then certain= ly having the tests require the same motivation as feature X. But yeah, t= he actual kernel code change is smaller than it looks at first sight. > > -- = > Thanks, > > David / dhildenb -- Best Regards, Yan, Zi --=_MailMate_7EF800F6-588F-4AE4-909D-5775F8A02B83_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmQ+oowPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhU3ykP+wRt9zBYbVEprluv/xhZhFq8Vxhlfgi/v6Yo ZGoedu6yksFPONQvTFuIsb73w1kjvVGHy60h9OqWWoMQGOvB+2lPC/tWMK/8TcE0 9PZrzo0Frt5XiMrDXWdBFHsSEbwFupITrNvbooqout+JEkWLDGifwTM05bZQJgwg 8MgccjHopOimBACXMTNNzIkW4iePMXnB5BxBRlSKn1RQCSv2bEFjOMZdMFi7M1LD 2WC79ipJl1qN1PZ2YKb5NCOjj3S57nPEW42QZWuL9MgitWLJmfBUodca500GEG50 pirkM6MQPmIkNsgBClFvPIVYuwuuebrndos7wkdGBJ3bfAGt0v91b8gC0ilhXjUX le1SzCkTfFtJeo1gbN9baKln61USx3BtavmJKQA0dTLuzWD23QFb+/9lq5YC425r F9cwwXEnI7Yvtuxh2Q8I/3vVF4MwGM+/2isL+mWzU5jd+7yokaukiaWpPBcyPrOu Nm28lfqoMttOxumZOraG2/OaNfh74ZQ4IPG1T1grBCu0hVp/WIxqMZlvBpC4ROZv mqc/vmoMiQSy3MIs0R08TQWLbxenNevwFeqAIWKwNkFyBwam4Gk8Al29DyqF3hX/ 2BHaNVVmi6mNaIifx1vnFajVbvsKGURvUCDXHEKxCXYJ7HePnAwhZ7IBx1eb3wy/ o8QXb+77 =4mbv -----END PGP SIGNATURE----- --=_MailMate_7EF800F6-588F-4AE4-909D-5775F8A02B83_=--