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From: Huangzhaoyang <huangzhaoyang@gmail.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	Zhaoyang Huang <zhaoyang.huang@unisoc.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH] mm: record context on page->mapping
Date: Thu, 10 Feb 2022 17:01:55 +0800	[thread overview]
Message-ID: <1644483715-7981-1-git-send-email-huangzhaoyang@gmail.com> (raw)

From: Zhaoyang Huang <zhaoyang.huang@unisoc.com>

Since page->mapping is vacant in the pages which used by kernel(drivers etc)
Have it record current context to help tracking the page's owner in system
memory dump.

Signed-off-by: Zhaoyang Huang <zhaoyang.huang@unisoc.com>
---
 mm/page_alloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index c595274..2757d10 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2430,6 +2430,8 @@ static void prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags
 		set_page_pfmemalloc(page);
 	else
 		clear_page_pfmemalloc(page);
+
+	page->mapping = (struct address_space *)current;
 }
 
 /*
-- 
1.9.1


             reply	other threads:[~2022-02-10  9:02 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-10  9:01 Huangzhaoyang [this message]
2022-02-10 10:00 ` [RFC PATCH] mm: record context on page->mapping Zhaoyang Huang
2022-02-10 13:18 ` Matthew Wilcox

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