linux-kernel - [RFC PATCH 10/31] mm: proc: add 1GB THP kpageflag.

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Date:   Fri, 15 Feb 2019 14:08:35 -0800
From:   Zi Yan <zi.yan@...t.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Michal Hocko <mhocko@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        John Hubbard <jhubbard@...dia.com>,
        Mark Hairgrove <mhairgrove@...dia.com>,
        Nitin Gupta <nigupta@...dia.com>,
        David Nellans <dnellans@...dia.com>, Zi Yan <ziy@...dia.com>
Subject: [RFC PATCH 10/31] mm: proc: add 1GB THP kpageflag.

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

Bit 27 is used to identify 1GB THP.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 fs/proc/page.c                         | 2 ++
 include/uapi/linux/kernel-page-flags.h | 2 ++
 2 files changed, 4 insertions(+)

diff --git a/fs/proc/page.c b/fs/proc/page.c
index 40b05e0d4274..5d1471a6082a 100644
--- a/fs/proc/page.c
+++ b/fs/proc/page.c
@@ -138,6 +138,8 @@ u64 stable_page_flags(struct page *page)
 			u |= 1 << KPF_ZERO_PAGE;
 			u |= 1 << KPF_THP;
 		}
+		if (compound_order(head) == HPAGE_PUD_ORDER)
+			u |= 1 << KPF_PUD_THP;
 	} else if (is_zero_pfn(page_to_pfn(page)))
 		u |= 1 << KPF_ZERO_PAGE;
 
diff --git a/include/uapi/linux/kernel-page-flags.h b/include/uapi/linux/kernel-page-flags.h
index 21b9113c69da..743bd730917d 100644
--- a/include/uapi/linux/kernel-page-flags.h
+++ b/include/uapi/linux/kernel-page-flags.h
@@ -36,5 +36,7 @@
 #define KPF_ZERO_PAGE		24
 #define KPF_IDLE		25
 #define KPF_PGTABLE		26
+#define KPF_PUD_THP		27
+
 
 #endif /* _UAPILINUX_KERNEL_PAGE_FLAGS_H */
-- 
2.20.1