[PATCH 3/6] pagemap: export KPF_THP
From: Naoya Horiguchi <hidden>
Date: 2012-02-08 15:52:53
Also in:
lkml
This flag shows that a given pages is a subpage of transparent hugepage. It helps us debug and test kernel by showing physical address of thp. Signed-off-by: Naoya Horiguchi <redacted> Reviewed-by: Wu Fengguang <redacted> Reviewed-by: KAMEZAWA Hiroyuki <redacted> Acked-by: KOSAKI Motohiro <redacted> Changes since v2: - replace if with else-if not to set KPF_THP for hugetlbfs page Changes since v1: - remove unnecessary ifdefs - fix confusing patch description --- fs/proc/page.c | 2 ++ include/linux/kernel-page-flags.h | 1 + 2 files changed, 3 insertions(+), 0 deletions(-)
diff --git 3.3-rc2.orig/fs/proc/page.c 3.3-rc2/fs/proc/page.c
index 6d8e6a9..7fcd0d6 100644
--- 3.3-rc2.orig/fs/proc/page.c
+++ 3.3-rc2/fs/proc/page.c@@ -115,6 +115,8 @@ u64 stable_page_flags(struct page *page) u |= 1 << KPF_COMPOUND_TAIL; if (PageHuge(page)) u |= 1 << KPF_HUGE; + else if (PageTransCompound(page)) + u |= 1 << KPF_THP; /* * Caveats on high order pages: page->_count will only be set
diff --git 3.3-rc2.orig/include/linux/kernel-page-flags.h 3.3-rc2/include/linux/kernel-page-flags.h
index bd92a89..26a6571 100644
--- 3.3-rc2.orig/include/linux/kernel-page-flags.h
+++ 3.3-rc2/include/linux/kernel-page-flags.h@@ -30,6 +30,7 @@ #define KPF_NOPAGE 20 #define KPF_KSM 21 +#define KPF_THP 22 /* kernel hacking assistances * WARNING: subject to change, never rely on them!
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1.7.7.6
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