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mm:add KPF_ZERO_PAGE flag for /proc/kpageflags

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Add KPF_ZERO_PAGE flag for zero_page, so that userspace processes can
detect zero_page in /proc/kpageflags, and then do memory analysis more
accurately.

Signed-off-by: Yalin Wang <[email protected]>
Acked-by: Kirill A. Shutemov <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Cc: Naoya Horiguchi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Wang, Yalin 2015-02-11 15:24:51 -08:00 • committed by Linus Torvalds
commit 56873f43ab
6 changed files with 36 additions and 9 deletions
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8
Documentation/vm/pagemap.txt
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@ -62,6 +62,8 @@ There are three components to pagemap:
20. NOPAGE
21. KSM
22. THP
23. BALLOON
24. ZERO_PAGE
Short descriptions to the page flags:
@ -102,6 +104,12 @@ Short descriptions to the page flags:
22. THP
contiguous pages which construct transparent hugepages
23. BALLOON
balloon compaction page
24. ZERO_PAGE
zero page for pfn_zero or huge_zero page
[IO related page flags]
1. ERROR IO error occurred
3. UPTODATE page has up-to-date data