diff options
| author | Hugh Dickins <hughd@google.com> | 2021-06-24 18:39:23 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-06-24 19:40:53 -0700 |
| commit | a765c417d876cc635f628365ec9aa6f09470069a (patch) | |
| tree | 7b213a4aac5f5b8c8c5b80189007049054764586 | |
| parent | 474466301dfd8b39a10c01db740645f3f7ae9a28 (diff) | |
| download | linux-a765c417d876cc635f628365ec9aa6f09470069a.tar.gz linux-a765c417d876cc635f628365ec9aa6f09470069a.tar.xz | |
mm: page_vma_mapped_walk(): get vma_address_end() earlier
page_vma_mapped_walk() cleanup: get THP's vma_address_end() at the
start, rather than later at next_pte.
It's a little unnecessary overhead on the first call, but makes for a
simpler loop in the following commit.
Link: https://lkml.kernel.org/r/4542b34d-862f-7cb4-bb22-e0df6ce830a2@google.com
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Wang Yugui <wangyugui@e16-tech.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page_vma_mapped.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/mm/page_vma_mapped.c b/mm/page_vma_mapped.c index 6b9320340f1b..df89ea3df4f4 100644 --- a/mm/page_vma_mapped.c +++ b/mm/page_vma_mapped.c @@ -171,6 +171,15 @@ bool page_vma_mapped_walk(struct page_vma_mapped_walk *pvmw) return true; } + /* + * Seek to next pte only makes sense for THP. + * But more important than that optimization, is to filter out + * any PageKsm page: whose page->index misleads vma_address() + * and vma_address_end() to disaster. + */ + end = PageTransCompound(page) ? + vma_address_end(page, pvmw->vma) : + pvmw->address + PAGE_SIZE; if (pvmw->pte) goto next_pte; restart: @@ -238,10 +247,6 @@ this_pte: if (check_pte(pvmw)) return true; next_pte: - /* Seek to next pte only makes sense for THP */ - if (!PageTransHuge(page)) - return not_found(pvmw); - end = vma_address_end(page, pvmw->vma); do { pvmw->address += PAGE_SIZE; if (pvmw->address >= end) |