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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 <yalin.wang@sonymobile.com>
Acked-by: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Wang, Yalin
2015-02-11 15:24:51 -08:00
committed by Linus Torvalds
parent 1d148e218a
commit 56873f43ab
6 changed files with 36 additions and 9 deletions
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Documentation/vm/pagemap.txt
+8
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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