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Kravetz , Hugh Dickins , "Matthew Wilcox (Oracle)" , Ryan Roberts , Yin Fengwei , Yang Shi Subject: Re: [PATCH mm-unstable v1] mm: add a total mapcount for large folios Date: Wed, 09 Aug 2023 11:45:31 -0400 X-Mailer: MailMate (1.14r5964) Message-ID: <6BE8E079-974A-4D4D-8577-92DE72759710@nvidia.com> In-Reply-To: <20230809083256.699513-1-david@redhat.com> References: <20230809083256.699513-1-david@redhat.com> Content-Type: multipart/signed; boundary="=_MailMate_BEE70BB7-7018-472C-9985-F5285C122516_="; micalg=pgp-sha512; protocol="application/pgp-signature" X-ClientProxiedBy: BL1PR13CA0095.namprd13.prod.outlook.com (2603:10b6:208:2b9::10) To DS7PR12MB5744.namprd12.prod.outlook.com (2603:10b6:8:73::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB5744:EE_|DS0PR12MB8200:EE_ X-MS-Office365-Filtering-Correlation-Id: 20e91367-67f4-407e-de42-08db98efab09 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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 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_BEE70BB7-7018-472C-9985-F5285C122516_= Content-Type: text/plain On 9 Aug 2023, at 4:32, David Hildenbrand wrote: > Let's track the total mapcount for all large folios in the first subpage. > > The total mapcount is what we actually want to know in folio_mapcount() > and it is also sufficient for implementing folio_mapped(). This also > gets rid of any "raceiness" concerns as expressed in > folio_total_mapcount(). > > With sub-PMD THP becoming more important and things looking promising > that we will soon get support for such anon THP, we want to avoid looping > over all pages of a folio just to calculate the total mapcount. Further, > we may soon want to use the total mapcount in other context more > frequently, so prepare for reading it efficiently and atomically. > > Make room for the total mapcount in page[1] of the folio by moving > _nr_pages_mapped to page[2] of the folio: it is not applicable to hugetlb > -- and with the total mapcount in place probably also not desirable even > if PMD-mappable hugetlb pages could get PTE-mapped at some point -- so we > can overlay the hugetlb fields. > > Note that we currently don't expect any order-1 compound pages / THP in > rmap code, and that such support is not planned. If ever desired, we could > move the compound mapcount to another page, because it only applies to > PMD-mappable folios that are definitely larger. Let's avoid consuming > more space elsewhere for now -- we might need more space for a different > purpose in some subpages soon. > > Maintain the total mapcount also for hugetlb pages. Use the total mapcount > to implement folio_mapcount(), total_mapcount(), folio_mapped() and > page_mapped(). > > We can now get rid of folio_total_mapcount() and > folio_large_is_mapped(), by just inlining reading of the total mapcount. > > _nr_pages_mapped is now only used in rmap code, so not accidentially > externally where it might be used on arbitrary order-1 pages. The remaining > usage is: > > (1) Detect how to adjust stats: NR_ANON_MAPPED and NR_FILE_MAPPED > -> If we would account the total folio as mapped when mapping a > page (based on the total mapcount), we could remove that usage. > > (2) Detect when to add a folio to the deferred split queue > -> If we would apply a different heuristic, or scan using the rmap on > the memory reclaim path for partially mapped anon folios to > split them, we could remove that usage as well. > > So maybe, we can simplify things in the future and remove > _nr_pages_mapped. For now, leave these things as they are, they need more > thought. Hugh really did a nice job implementing that precise tracking > after all. > > Note: Not adding order-1 sanity checks to the file_rmap functions for > now. For anon pages, they are certainly not required right now. > > Cc: Andrew Morton > Cc: Jonathan Corbet > Cc: Mike Kravetz > Cc: Hugh Dickins > Cc: "Matthew Wilcox (Oracle)" > Cc: Ryan Roberts > Cc: Yin Fengwei > Cc: Yang Shi > Cc: Zi Yan > Signed-off-by: David Hildenbrand > --- > Documentation/mm/transhuge.rst | 12 +++++----- > include/linux/mm.h | 31 ++++++------------------ > include/linux/mm_types.h | 6 +++-- > include/linux/rmap.h | 7 ++++-- > mm/debug.c | 4 ++-- > mm/huge_memory.c | 2 ++ > mm/hugetlb.c | 4 ++-- > mm/internal.h | 17 ++++--------- > mm/page_alloc.c | 4 ++-- > mm/rmap.c | 44 ++++++++++++++-------------------- > 10 files changed, 52 insertions(+), 79 deletions(-) > LGTM. Thanks. Reviewed-by: Zi Yan -- Best Regards, Yan, Zi --=_MailMate_BEE70BB7-7018-472C-9985-F5285C122516_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEE6rR4j8RuQ2XmaZol4n+egRQHKFQFAmTTtJsPHHppeUBudmlk aWEuY29tAAoJEOJ/noEUByhUkvsQAKaDcC33LSGlycVnoWQPQSytt2U8ogKzyEuq JwKbl5WIwGdKxenJELgWvDDMtjuu8KI58/3Mjk3nHwobb5U1lDLmY5+Adid6/mEK SVEnmQVwsVgDbhMW0jd7rCEhPoFfJfIuP7mjW1YO1BvswpPxmvXwqTfNjPMVfEOi AJjSV0LPn2lI6pQzMYUz3xkkTsSEyl2Mjhgiy4bU9g45LH7OaDv+SJH7hLYAkcsV rR+YzYB9Hah1wDhnzY3vLZiyZghAp0EWQYkNeOfYLuLvxHWiuT3+7Wswc1MobXv0 tqT/OAUG01iwVoEV9dq4zrlTurYb+XS8mCppRn2/pxx96cGQ0gz32ByhHLlIzmGa wyEeG3SCE09G3s5DqRTFEcbE5vBwrzgKXz31Bh8+DHzz2QBSU2RVE00wyCzATnEp 8LhZKz5JrkaGgOMcMv6PceOFtot+HraXhJdFmQmXNqIkmgHaycoO/11CSwENvceT zINfGGmFQOOrF61qM/M6BypDNo7s3kzs/MBh9K6PLk4gep4jxfi24LA/gN/oLDNg pL3IKQt2u0E/15CUL50hEqXj6U+MRAamBvxXrYg4R3PiFeivTTDGiXp2rps80LHR HMDK0f1v4ECGhlyDvTlYQx95hj5brxLYqp3WWnMw2lB0uh6At/xePS+ITkK5Bnbb CY+P0VNY =XamJ -----END PGP SIGNATURE----- --=_MailMate_BEE70BB7-7018-472C-9985-F5285C122516_=--