From 553e5d6ddaef758bea4647c4fa333971b76046a7 Mon Sep 17 00:00:00 2001 From: Yang Shi Date: Thu, 14 Apr 2022 12:16:45 -0700 Subject: [PATCH] mm: thp: only regular file could be THP eligible Since commit a4aeaa06d45e ("mm: khugepaged: skip huge page collapse for special files"), khugepaged just collapses THP for regular file which is the intended usecase for readonly fs THP. Only show regular file as THP eligible accordingly. And make file_thp_enabled() available for khugepaged too in order to remove duplicate code. Link: https://lkml.kernel.org/r/20220404200250.321455-5-shy828301@gmail.com Signed-off-by: Yang Shi Acked-by: Song Liu Cc: "Kirill A. Shutemov" Cc: Matthew Wilcox Cc: Miaohe Lin Cc: Rik van Riel Cc: Theodore Ts'o Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- include/linux/huge_mm.h | 14 ++++++++++++++ mm/huge_memory.c | 11 ++--------- mm/khugepaged.c | 9 ++------- 3 files changed, 18 insertions(+), 16 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 9a26bd10e083..816a9937f30e 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -173,6 +173,20 @@ static inline bool __transparent_hugepage_enabled(struct vm_area_struct *vma) return false; } +static inline bool file_thp_enabled(struct vm_area_struct *vma) +{ + struct inode *inode; + + if (!vma->vm_file) + return false; + + inode = vma->vm_file->f_inode; + + return (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) && + (vma->vm_flags & VM_EXEC) && + !inode_is_open_for_write(inode) && S_ISREG(inode->i_mode); +} + bool transparent_hugepage_active(struct vm_area_struct *vma); #define transparent_hugepage_use_zero_page() \ diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 6ca56eb75681..8103b518b46e 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -69,13 +69,6 @@ static atomic_t huge_zero_refcount; struct page *huge_zero_page __read_mostly; unsigned long huge_zero_pfn __read_mostly = ~0UL; -static inline bool file_thp_enabled(struct vm_area_struct *vma) -{ - return transhuge_vma_enabled(vma, vma->vm_flags) && vma->vm_file && - !inode_is_open_for_write(vma->vm_file->f_inode) && - (vma->vm_flags & VM_EXEC); -} - bool transparent_hugepage_active(struct vm_area_struct *vma) { /* The addr is used to check if the vma size fits */ @@ -87,8 +80,8 @@ bool transparent_hugepage_active(struct vm_area_struct *vma) return __transparent_hugepage_enabled(vma); if (vma_is_shmem(vma)) return shmem_huge_enabled(vma); - if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS)) - return file_thp_enabled(vma); + if (transhuge_vma_enabled(vma, vma->vm_flags) && file_thp_enabled(vma)) + return true; return false; } diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 5693489cbfb1..c41587d5b912 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -464,13 +464,8 @@ static bool hugepage_vma_check(struct vm_area_struct *vma, return false; /* Only regular file is valid */ - if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && vma->vm_file && - (vm_flags & VM_EXEC)) { - struct inode *inode = vma->vm_file->f_inode; - - return !inode_is_open_for_write(inode) && - S_ISREG(inode->i_mode); - } + if (file_thp_enabled(vma)) + return true; if (!vma->anon_vma || vma->vm_ops) return false; -- 2.50.1