The patch titled
Subject: pagemap: export KPF_THP
has been added to the -mm tree. Its filename is
pagemap-export-kpf_thp.patch
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------------------------------------------------------
From: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Subject: 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: 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>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Andi Kleen <andi@xxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/page.c | 2 ++
include/linux/kernel-page-flags.h | 1 +
2 files changed, 3 insertions(+)
diff -puN fs/proc/page.c~pagemap-export-kpf_thp fs/proc/page.c
--- a/fs/proc/page.c~pagemap-export-kpf_thp
+++ a/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 -puN include/linux/kernel-page-flags.h~pagemap-export-kpf_thp include/linux/kernel-page-flags.h
--- a/include/linux/kernel-page-flags.h~pagemap-export-kpf_thp
+++ a/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!
_
Subject: Subject: pagemap: export KPF_THP
Patches currently in -mm which might be from n-horiguchi@xxxxxxxxxxxxx are
pagemap-avoid-splitting-thp-when-reading-proc-pid-pagemap.patch
thp-optimize-away-unnecessary-page-table-locking.patch
pagemap-export-kpf_thp.patch
pagemap-document-kpf_thp-and-make-page-types-aware-of-it.patch
mm-introduce-pmd_to_pte_t.patch
pagemap-introduce-data-structure-for-pagemap-entry.patch
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