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charset="utf-8" This allows to test folio_split() by specifying an additional in folio page offset parameter to split_huge_page debugfs interface. Signed-off-by: Zi Yan Cc: Baolin Wang Cc: David Hildenbrand Cc: Hugh Dickins Cc: John Hubbard Cc: Kefeng Wang Cc: Kirill A. Shuemov Cc: Matthew Wilcox Cc: Miaohe Lin Cc: Ryan Roberts Cc: Yang Shi Cc: Yu Zhao Cc: Kairui Song --- mm/huge_memory.c | 47 ++++++++++++++++++++++++++++++++++------------- 1 file changed, 34 insertions(+), 13 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 6cc97d592797..d44b6d4b7f32 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -4325,7 +4325,8 @@ static inline bool vma_not_suitable_for_thp_split(str= uct vm_area_struct *vma) } =20 static int split_huge_pages_pid(int pid, unsigned long vaddr_start, - unsigned long vaddr_end, unsigned int new_order) + unsigned long vaddr_end, unsigned int new_order, + long in_folio_offset) { int ret =3D 0; struct task_struct *task; @@ -4409,8 +4410,16 @@ static int split_huge_pages_pid(int pid, unsigned lo= ng vaddr_start, if (!folio_test_anon(folio) && folio->mapping !=3D mapping) goto unlock; =20 - if (!split_folio_to_order(folio, target_order)) - split++; + if (in_folio_offset < 0 || + in_folio_offset >=3D folio_nr_pages(folio)) { + if (!split_folio_to_order(folio, target_order)) + split++; + } else { + struct page *split_at =3D folio_page(folio, + in_folio_offset); + if (!folio_split(folio, target_order, split_at, NULL)) + split++; + } =20 unlock: =20 @@ -4433,7 +4442,8 @@ static int split_huge_pages_pid(int pid, unsigned lon= g vaddr_start, } =20 static int split_huge_pages_in_file(const char *file_path, pgoff_t off_sta= rt, - pgoff_t off_end, unsigned int new_order) + pgoff_t off_end, unsigned int new_order, + long in_folio_offset) { struct filename *file; struct file *candidate; @@ -4482,8 +4492,15 @@ static int split_huge_pages_in_file(const char *file= _path, pgoff_t off_start, if (folio->mapping !=3D mapping) goto unlock; =20 - if (!split_folio_to_order(folio, target_order)) - split++; + if (in_folio_offset < 0 || in_folio_offset >=3D nr_pages) { + if (!split_folio_to_order(folio, target_order)) + split++; + } else { + struct page *split_at =3D folio_page(folio, + in_folio_offset); + if (!folio_split(folio, target_order, split_at, NULL)) + split++; + } =20 unlock: folio_unlock(folio); @@ -4516,6 +4533,7 @@ static ssize_t split_huge_pages_write(struct file *fi= le, const char __user *buf, int pid; unsigned long vaddr_start, vaddr_end; unsigned int new_order =3D 0; + long in_folio_offset =3D -1; =20 ret =3D mutex_lock_interruptible(&split_debug_mutex); if (ret) @@ -4544,30 +4562,33 @@ static ssize_t split_huge_pages_write(struct file *= file, const char __user *buf, goto out; } =20 - ret =3D sscanf(tok_buf, "0x%lx,0x%lx,%d", &off_start, - &off_end, &new_order); - if (ret !=3D 2 && ret !=3D 3) { + ret =3D sscanf(tok_buf, "0x%lx,0x%lx,%d,%ld", &off_start, &off_end, + &new_order, &in_folio_offset); + if (ret !=3D 2 && ret !=3D 3 && ret !=3D 4) { ret =3D -EINVAL; goto out; } - ret =3D split_huge_pages_in_file(file_path, off_start, off_end, new_orde= r); + ret =3D split_huge_pages_in_file(file_path, off_start, off_end, + new_order, in_folio_offset); if (!ret) ret =3D input_len; =20 goto out; } =20 - ret =3D sscanf(input_buf, "%d,0x%lx,0x%lx,%d", &pid, &vaddr_start, &vaddr= _end, &new_order); + ret =3D sscanf(input_buf, "%d,0x%lx,0x%lx,%d,%ld", &pid, &vaddr_start, + &vaddr_end, &new_order, &in_folio_offset); if (ret =3D=3D 1 && pid =3D=3D 1) { split_huge_pages_all(); ret =3D strlen(input_buf); goto out; - } else if (ret !=3D 3 && ret !=3D 4) { + } else if (ret !=3D 3 && ret !=3D 4 && ret !=3D 5) { ret =3D -EINVAL; goto out; } =20 - ret =3D split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order); + ret =3D split_huge_pages_pid(pid, vaddr_start, vaddr_end, new_order, + in_folio_offset); if (!ret) ret =3D strlen(input_buf); out: --=20 2.47.2