linux-kernel - [RFC PATCH] mm: record context on page->mapping

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Date:   Thu, 10 Feb 2022 17:01:55 +0800
From:   Huangzhaoyang <huangzhaoyang@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Zhaoyang Huang <zhaoyang.huang@...soc.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH] mm: record context on page->mapping

From: Zhaoyang Huang <zhaoyang.huang@...soc.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@...soc.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