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Commit e873c49f authored by Naoya Horiguchi's avatar Naoya Horiguchi Committed by Linus Torvalds
Browse files

pagemap: export KPF_THP 



This flag shows that a given page is a subpage of a transparent hugepage.
It helps us debug and test the kernel by showing physical address of thp.

Signed-off-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Reviewed-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 025c5b24

fs/proc/page.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -115,6 +115,8 @@ u64 stable_page_flags(struct page *page) 
		u |= 1 << KPF_COMPOUND_TAIL;

		u |= 1 << KPF_COMPOUND_TAIL;

	if (PageHuge(page))

	if (PageHuge(page))

		u |= 1 << KPF_HUGE;

		u |= 1 << KPF_HUGE;

	else if (PageTransCompound(page))

		u |= 1 << KPF_THP;





	/*

	/*

	 * Caveats on high order pages: page->_count will only be set

	 * Caveats on high order pages: page->_count will only be set

include/linux/kernel-page-flags.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -30,6 +30,7 @@ 
#define KPF_NOPAGE		20

#define KPF_NOPAGE		20





#define KPF_KSM			21

#define KPF_KSM			21

#define KPF_THP			22





/* kernel hacking assistances

/* kernel hacking assistances

 * WARNING: subject to change, never rely on them!

 * WARNING: subject to change, never rely on them!