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authorWang, Yalin <Yalin.Wang@sonymobile.com>2015-02-11 15:24:51 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 17:06:00 -0800
commit56873f43abdcd574b25105867a990f067747b2f4 (patch)
treebe55c69ee61da7b4e10e46c89e62a2ca68adaf81 /Documentation
parent1d148e218a0d0566b1c06f2f45f1436d53b049b2 (diff)
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mm:add KPF_ZERO_PAGE flag for /proc/kpageflags
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>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/vm/pagemap.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/vm/pagemap.txt b/Documentation/vm/pagemap.txt
index 5948e455c4d2..6fbd55ef6b45 100644
--- a/Documentation/vm/pagemap.txt
+++ b/Documentation/vm/pagemap.txt
@@ -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