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 <n-horiguchi@xxxxxxxxxxxxx> Reviewed-by: Wu Fengguang <fengguang.wu@xxxxxxxxx> Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Acked-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> 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-rc1.orig/fs/proc/page.c 3.3-rc1/fs/proc/page.c index 6d8e6a9..7fcd0d6 100644 --- 3.3-rc1.orig/fs/proc/page.c +++ 3.3-rc1/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-rc1.orig/include/linux/kernel-page-flags.h 3.3-rc1/include/linux/kernel-page-flags.h index bd92a89..26a6571 100644 --- 3.3-rc1.orig/include/linux/kernel-page-flags.h +++ 3.3-rc1/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! -- 1.7.7.6 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>