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From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>, linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: [PATCH] mm/debug: Improve memcg debugging
Date: Thu, 14 Jan 2021 19:02:00 +0000
Message-ID: <20210114190200.1894484-1-willy@infradead.org> (raw)

The memcg_data is only valid on the head page, not the tail pages.
Change the format and location of the printout within the dump to
match the other parts of struct page better.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
 mm/debug.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/debug.c b/mm/debug.c
index 8a40b3fefbeb..0bdda8407f71 100644
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -110,6 +110,11 @@ void __dump_page(struct page *page, const char *reason)
 					head_compound_mapcount(head));
 		}
 	}
+
+#ifdef CONFIG_MEMCG
+	if (head->memcg_data)
+		pr_warn("memcg:%lx\n", head->memcg_data);
+#endif
 	if (PageKsm(page))
 		type = "ksm ";
 	else if (PageAnon(page))
@@ -180,11 +185,6 @@ void __dump_page(struct page *page, const char *reason)
 
 	if (reason)
 		pr_warn("page dumped because: %s\n", reason);
-
-#ifdef CONFIG_MEMCG
-	if (!page_poisoned && page->memcg_data)
-		pr_warn("pages's memcg:%lx\n", page->memcg_data);
-#endif
 }
 
 void dump_page(struct page *page, const char *reason)
-- 
2.29.2



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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-14 19:02 Matthew Wilcox (Oracle) [this message]
2021-01-15  2:19 ` Zi Yan

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