diff options
author | Kirill A. Shutemov <kirill@shutemov.name> | 2014-12-11 02:44:36 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-11 04:41:08 +0300 |
commit | c164e038eee805147e95789dddb88ae3b3aca11c (patch) | |
tree | 6e3c5c99920142d46a9acb3d334e58c78d005467 /arch/sparc/include | |
parent | 2314b42db67be30b747122d65c6cd2c85da34538 (diff) | |
download | linux-c164e038eee805147e95789dddb88ae3b3aca11c.tar.xz |
mm: fix huge zero page accounting in smaps report
As a small zero page, huge zero page should not be accounted in smaps
report as normal page.
For small pages we rely on vm_normal_page() to filter out zero page, but
vm_normal_page() is not designed to handle pmds. We only get here due
hackish cast pmd to pte in smaps_pte_range() -- pte and pmd format is not
necessary compatible on each and every architecture.
Let's add separate codepath to handle pmds. follow_trans_huge_pmd() will
detect huge zero page for us.
We would need pmd_dirty() helper to do this properly. The patch adds it
to THP-enabled architectures which don't yet have one.
[akpm@linux-foundation.org: use do_div to fix 32-bit build]
Signed-off-by: "Kirill A. Shutemov" <kirill@shutemov.name>
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Tested-by: Fengwei Yin <yfw.kernel@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/sparc/include')
-rw-r--r-- | arch/sparc/include/asm/pgtable_64.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index bfeb626085ac..1ff9e7864168 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -667,6 +667,13 @@ static inline unsigned long pmd_pfn(pmd_t pmd) } #ifdef CONFIG_TRANSPARENT_HUGEPAGE +static inline unsigned long pmd_dirty(pmd_t pmd) +{ + pte_t pte = __pte(pmd_val(pmd)); + + return pte_dirty(pte); +} + static inline unsigned long pmd_young(pmd_t pmd) { pte_t pte = __pte(pmd_val(pmd)); |