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author | 2014-12-10 15:44:36 -0800 | |
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committer | 2014-12-10 17:41:08 -0800 | |
commit | c164e038eee805147e95789dddb88ae3b3aca11c (patch) | |
tree | 6e3c5c99920142d46a9acb3d334e58c78d005467 /mm/rmap.c | |
parent | mm: memcontrol: drop bogus RCU locking from mem_cgroup_same_or_subtree() (diff) | |
download | linux-c164e038eee805147e95789dddb88ae3b3aca11c.tar.gz linux-c164e038eee805147e95789dddb88ae3b3aca11c.tar.bz2 linux-c164e038eee805147e95789dddb88ae3b3aca11c.zip |
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 'mm/rmap.c')
0 files changed, 0 insertions, 0 deletions