linux-kernel - [RFC PATCH 11/31] mm: debug: print compound page order in dump

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Date:   Fri, 15 Feb 2019 14:08:36 -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 11/31] mm: debug: print compound page order in dump_page().

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

Since we have more than just PMD-level THPs, printing compound page
order is helpful to check the actual compound page sizes.

Signed-off-by: Zi Yan <ziy@...dia.com>
---
 mm/debug.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/debug.c b/mm/debug.c
index 0abb987dad9b..21d211d7776c 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -68,8 +68,12 @@ void __dump_page(struct page *page, const char *reason)
 	pr_warn("page:%px count:%d mapcount:%d mapping:%px index:%#lx",
 		  page, page_ref_count(page), mapcount,
 		  page->mapping, page_to_pgoff(page));
-	if (PageCompound(page))
-		pr_cont(" compound_mapcount: %d", compound_mapcount(page));
+	if (PageCompound(page)) {
+		struct page *head = compound_head(page);
+
+		pr_cont(" compound_mapcount: %d, order: %d", compound_mapcount(page),
+				compound_order(head));
+	}
 	pr_cont("\n");
 	if (PageAnon(page))
 		pr_warn("anon ");
-- 
2.20.1