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Subject[RFC PATCH v2 10/30] fs: proc: add PUD THP kpageflag.
Date
From: Zi Yan <ziy@nvidia.com>

Bit 27 is used to identify PUD THP.

Signed-off-by: Zi Yan <ziy@nvidia.com>
---
fs/proc/page.c | 2 ++
include/uapi/linux/kernel-page-flags.h | 1 +
2 files changed, 3 insertions(+)

diff --git a/fs/proc/page.c b/fs/proc/page.c
index f3b39a7d2bf3..e4e2ad3612c9 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -161,6 +161,8 @@ u64 stable_page_flags(struct page *page)
u |= BIT_ULL(KPF_ZERO_PAGE);
u |= BIT_ULL(KPF_THP);
}
+ if (compound_order(head) == HPAGE_PUD_ORDER)
+ u |= 1 << KPF_PUD_THP;
} else if (is_zero_pfn(page_to_pfn(page)))
u |= BIT_ULL(KPF_ZERO_PAGE);

diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h
index 6f2f2720f3ac..62c5fc70909b 100644
--- a/include/uapi/linux/kernel-page-flags.h
+++ b/include/uapi/linux/kernel-page-flags.h
@@ -36,5 +36,6 @@
#define KPF_ZERO_PAGE 24
#define KPF_IDLE 25
#define KPF_PGTABLE 26
+#define KPF_PUD_THP 27

#endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
--
2.28.0
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