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Fri, 23 Jan 2026 00:23:07 -0800 (PST) Received: from localhost.localdomain ([221.227.246.159]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-c635a43f11csm1348363a12.35.2026.01.23.00.23.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Jan 2026 00:23:06 -0800 (PST) From: Vernon Yang To: akpm@linux-foundation.org, david@kernel.org Cc: lorenzo.stoakes@oracle.com, ziy@nvidia.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vernon Yang Subject: [PATCH mm-new v5 3/5] mm: add folio_test_lazyfree helper Date: Fri, 23 Jan 2026 16:22:30 +0800 Message-ID: <20260123082232.16413-4-vernon2gm@gmail.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260123082232.16413-1-vernon2gm@gmail.com> References: <20260123082232.16413-1-vernon2gm@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 778FE80011 X-Stat-Signature: 77xmubqazqukui573fxahm8mk6bascpt X-Rspam-User: X-HE-Tag: 1769156588-717285 X-HE-Meta: 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 5TJZYryO 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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: List-Subscribe: List-Unsubscribe: From: Vernon Yang Add folio_test_lazyfree() function to identify lazy-free folios to improve code readability. Signed-off-by: Vernon Yang Acked-by: David Hildenbrand (Red Hat) Reviewed-by: Lance Yang --- include/linux/page-flags.h | 5 +++++ mm/rmap.c | 2 +- mm/vmscan.c | 5 ++--- 3 files changed, 8 insertions(+), 4 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index f7a0e4af0c73..415e9f2ef616 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -724,6 +724,11 @@ static __always_inline bool folio_test_anon(const struct folio *folio) return ((unsigned long)folio->mapping & FOLIO_MAPPING_ANON) != 0; } +static __always_inline bool folio_test_lazyfree(const struct folio *folio) +{ + return folio_test_anon(folio) && !folio_test_swapbacked(folio); +} + static __always_inline bool PageAnonNotKsm(const struct page *page) { unsigned long flags = (unsigned long)page_folio(page)->mapping; diff --git a/mm/rmap.c b/mm/rmap.c index 088723f909e4..6b09be06c707 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -2049,7 +2049,7 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, } if (!pvmw.pte) { - if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) { + if (folio_test_lazyfree(folio)) { if (unmap_huge_pmd_locked(vma, pvmw.address, pvmw.pmd, folio)) goto walk_done; /* diff --git a/mm/vmscan.c b/mm/vmscan.c index 8643c0fb9162..1f32c74ec738 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -944,8 +944,7 @@ static void folio_check_dirty_writeback(struct folio *folio, * They could be mistakenly treated as file lru. So further anon * test is needed. */ - if (!folio_is_file_lru(folio) || - (folio_test_anon(folio) && !folio_test_swapbacked(folio))) { + if (!folio_is_file_lru(folio) || folio_test_lazyfree(folio)) { *dirty = false; *writeback = false; return; @@ -1489,7 +1488,7 @@ static unsigned int shrink_folio_list(struct list_head *folio_list, } } - if (folio_test_anon(folio) && !folio_test_swapbacked(folio)) { + if (folio_test_lazyfree(folio)) { /* follow __remove_mapping for reference */ if (!folio_ref_freeze(folio, 1)) goto keep_locked; -- 2.51.0