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Sat, 15 May 2021 10:26:30 +0000 From: William Kucharski To: "Matthew Wilcox (Oracle)" CC: Andrew Morton , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" Subject: Re: [PATCH v10 00/33] Memory folios Thread-Topic: [PATCH v10 00/33] Memory folios Thread-Index: AQHXRq9jswEPtfPw80CEn1XLLho2uKrkXCmA Date: Sat, 15 May 2021 10:26:29 +0000 Message-ID: <26A8948B-00BC-49F1-A0B7-CE6310FA7A71@oracle.com> References: <20210511214735.1836149-1-willy@infradead.org> In-Reply-To: <20210511214735.1836149-1-willy@infradead.org> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3654.100.0.2.22) x-originating-ip: [2601:285:8200:4089:3d23:2196:422a:2535] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: c3081ff2-2957-469a-9583-08d9178be76d x-ms-traffictypediagnostic: CY4PR10MB1975: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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dkim=pass header.d=oracle.com header.s=corp-2020-01-29 header.b=aB04aaFH; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=d9Pkj+CA; spf=none (imf07.hostedemail.com: domain of william.kucharski@oracle.com has no SPF policy when checking 141.146.126.79) smtp.mailfrom=william.kucharski@oracle.com; dmarc=pass (policy=none) header.from=oracle.com X-Rspamd-Server: rspam04 X-Stat-Signature: 8tjhyr6rg3kh3yka5p1xbf7wzbfz8r7x X-HE-Tag: 1621074411-954213 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: I have a nit on part 01/33, but will respond directly there. For the series: Reviewed-by: William Kucharski > On May 11, 2021, at 3:47 PM, Matthew Wilcox (Oracle) wrote: >=20 > Managing memory in 4KiB pages is a serious overhead. Many benchmarks > benefit from a larger "page size". As an example, an earlier iteration > of this idea which used compound pages (and wasn't particularly tuned) > got a 7% performance boost when compiling the kernel. >=20 > Using compound pages or THPs exposes a weakness of our type system. > Functions are often unprepared for compound pages to be passed to them, > and may only act on PAGE_SIZE chunks. Even functions which are aware of > compound pages may expect a head page, and do the wrong thing if passed > a tail page. >=20 > We also waste a lot of instructions ensuring that we're not looking at > a tail page. Almost every call to PageFoo() contains one or more hidden > calls to compound_head(). This also happens for get_page(), put_page() > and many more functions. There does not appear to be a way to tell gcc > that it can cache the result of compound_head(), nor is there a way to > tell it that compound_head() is idempotent. >=20 > This patch series uses a new type, the struct folio, to manage memory. > It provides some basic infrastructure that's worthwhile in its own right, > shrinking the kernel by about 5kB of text. >=20 > Since v9: > - Rebase onto mmotm 2021-05-10-21-46 > - Add folio_memcg() definition for !MEMCG (intel lkp) > - Change folio->private from an unsigned long to a void * > - Use folio_page() to implement folio_file_page() > - Add folio_try_get() and folio_try_get_rcu() > - Trim back down to just the first few patches, which are better-reviewed= . > v9: https://lore.kernel.org/linux-mm/20210505150628.111735-1-willy@infrad= ead.org/ > v8: https://lore.kernel.org/linux-mm/20210430180740.2707166-1-willy@infra= dead.org/ >=20 > Matthew Wilcox (Oracle) (33): > mm: Introduce struct folio > mm: Add folio_pgdat and folio_zone > mm/vmstat: Add functions to account folio statistics > mm/debug: Add VM_BUG_ON_FOLIO and VM_WARN_ON_ONCE_FOLIO > mm: Add folio reference count functions > mm: Add folio_put > mm: Add folio_get > mm: Add folio_try_get_rcu > mm: Add folio flag manipulation functions > mm: Add folio_young and folio_idle > mm: Handle per-folio private data > mm/filemap: Add folio_index, folio_file_page and folio_contains > mm/filemap: Add folio_next_index > mm/filemap: Add folio_offset and folio_file_offset > mm/util: Add folio_mapping and folio_file_mapping > mm: Add folio_mapcount > mm/memcg: Add folio wrappers for various functions > mm/filemap: Add folio_unlock > mm/filemap: Add folio_lock > mm/filemap: Add folio_lock_killable > mm/filemap: Add __folio_lock_async > mm/filemap: Add __folio_lock_or_retry > mm/filemap: Add folio_wait_locked > mm/swap: Add folio_rotate_reclaimable > mm/filemap: Add folio_end_writeback > mm/writeback: Add folio_wait_writeback > mm/writeback: Add folio_wait_stable > mm/filemap: Add folio_wait_bit > mm/filemap: Add folio_wake_bit > mm/filemap: Convert page wait queues to be folios > mm/filemap: Add folio private_2 functions > fs/netfs: Add folio fscache functions > mm: Add folio_mapped >=20 > Documentation/core-api/mm-api.rst | 4 + > Documentation/filesystems/netfs_library.rst | 2 + > fs/afs/write.c | 9 +- > fs/cachefiles/rdwr.c | 16 +- > fs/io_uring.c | 2 +- > include/linux/memcontrol.h | 63 ++++ > include/linux/mm.h | 174 ++++++++-- > include/linux/mm_types.h | 71 ++++ > include/linux/mmdebug.h | 20 ++ > include/linux/netfs.h | 77 +++-- > include/linux/page-flags.h | 230 ++++++++++--- > include/linux/page_idle.h | 99 +++--- > include/linux/page_ref.h | 158 ++++++++- > include/linux/pagemap.h | 358 ++++++++++++-------- > include/linux/swap.h | 7 +- > include/linux/vmstat.h | 107 ++++++ > mm/Makefile | 2 +- > mm/filemap.c | 315 ++++++++--------- > mm/folio-compat.c | 43 +++ > mm/internal.h | 1 + > mm/memory.c | 8 +- > mm/page-writeback.c | 72 ++-- > mm/page_io.c | 4 +- > mm/swap.c | 18 +- > mm/swapfile.c | 8 +- > mm/util.c | 59 ++-- > 26 files changed, 1374 insertions(+), 553 deletions(-) > create mode 100644 mm/folio-compat.c >=20 > --=20 > 2.30.2 >=20 >=20