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Tue, 28 Mar 2023 21:17:33 -0400 (EDT) From: Zi Yan To: "Matthew Wilcox (Oracle)" , Yang Shi , Yu Zhao , linux-mm@kvack.org Cc: Zi Yan , "Kirill A . Shutemov" , Ryan Roberts , =?utf-8?q?Michal_Koutn=C3=BD?= , Roman Gushchin , "Zach O'Keefe" , Andrew Morton , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v2 0/7] Split a folio to any lower order folios Date: Tue, 28 Mar 2023 21:17:05 -0400 Message-Id: <20230329011712.3242298-1-zi.yan@sent.com> X-Mailer: git-send-email 2.39.2 Reply-To: Zi Yan MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam03 X-Stat-Signature: 3fji18tc7u6cfebp3zpmyg5am47oxpgw X-Rspamd-Queue-Id: 834E340005 X-HE-Tag: 1680052656-264151 X-HE-Meta: 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 Bao1oa/e 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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: From: Zi Yan Hi all, File folio supports any order and people would like to support flexible orders for anonymous folio[1] too. Currently, split_huge_page() only splits a huge page to order-0 pages, but splitting to orders higher than 0 is also useful. This patchset adds support for splitting a huge page to any lower order pages and uses it during folio truncate operations. The patchset is on top of mm-everything-2023-03-27-21-20. Changelog from v1 === 1. Changed split_page_memcg() and split_page_owner() parameter to use order 2. Used folio_test_pmd_mappable() in place of the equivalent code Details === * Patch 1 changes split_page_memcg() to use order instead of nr_pages * Patch 2 changes split_page_owner() to use order instead of nr_pages * Patch 3 and 4 add new_order parameter split_page_memcg() and split_page_owner() and prepare for upcoming changes. * Patch 5 adds split_huge_page_to_list_to_order() to split a huge page to any lower order. The original split_huge_page_to_list() calls split_huge_page_to_list_to_order() with new_order = 0. * Patch 6 uses split_huge_page_to_list_to_order() in large pagecache folio truncation instead of split the large folio all the way down to order-0. * Patch 7 adds a test API to debugfs and test cases in split_huge_page_test selftests. Comments and/or suggestions are welcome. [1] https://lore.kernel.org/linux-mm/Y%2FblF0GIunm+pRIC@casper.infradead.org/ Zi Yan (7): mm/memcg: use order instead of nr in split_page_memcg() mm/page_owner: use order instead of nr in split_page_owner() mm: memcg: make memcg huge page split support any order split. mm: page_owner: add support for splitting to any order in split page_owner. mm: thp: split huge page to any lower order pages. mm: truncate: split huge page cache page to a non-zero order if possible. mm: huge_memory: enable debugfs to split huge pages to any order. include/linux/huge_mm.h | 10 +- include/linux/memcontrol.h | 4 +- include/linux/page_owner.h | 10 +- mm/huge_memory.c | 137 ++++++++--- mm/memcontrol.c | 10 +- mm/page_alloc.c | 8 +- mm/page_owner.c | 10 +- mm/truncate.c | 21 +- .../selftests/mm/split_huge_page_test.c | 225 +++++++++++++++++- 9 files changed, 366 insertions(+), 69 deletions(-)