linux-kernel - [RFC PATCH v2 10/30] fs: proc: add PUD THP kpageflag.

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Message-Id: <20200928175428.4110504-11-zi.yan@sent.com>
Date:   Mon, 28 Sep 2020 13:54:08 -0400
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org
Cc:     "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Roman Gushchin <guro@...com>, Rik van Riel <riel@...riel.com>,
        Matthew Wilcox <willy@...radead.org>,
        Shakeel Butt <shakeelb@...gle.com>,
        Yang Shi <shy828301@...il.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Michal Hocko <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        William Kucharski <william.kucharski@...cle.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        John Hubbard <jhubbard@...dia.com>,
        David Nellans <dnellans@...dia.com>,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH v2 10/30] fs: proc: add PUD THP kpageflag.

From: Zi Yan <ziy@...dia.com>

Bit 27 is used to identify PUD THP.

Signed-off-by: Zi Yan <ziy@...dia.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