linux-kernel - [PATCH RFC 1/9] mm: add config option SWAP_PAGE

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Message-ID: <20251205231721.104505-2-mfo@igalia.com>
Date: Fri,  5 Dec 2025 20:17:13 -0300
From: Mauricio Faria de Oliveira <mfo@...lia.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Michal Hocko <mhocko@...e.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Oscar Salvador <osalvador@...e.de>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	kernel-dev@...lia.com
Subject: [PATCH RFC 1/9] mm: add config option SWAP_PAGE_OWNER

Add config option for page_owner support for pages in swap space.

Signed-off-by: Mauricio Faria de Oliveira <mfo@...lia.com>
---
 mm/Kconfig.debug | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index 7638d75b27db..60bc0b6c3d69 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug
@@ -119,6 +119,15 @@ config PAGE_OWNER
 
 	  If unsure, say N.
 
+config SWAP_PAGE_OWNER
+	bool "Track page owner in swap space (EXPERIMENTAL)"
+	depends on PAGE_OWNER
+	help
+	  This also keeps track of what call chain is the owner of a page
+	  in swap space, maintaining the initial call chain over swap-out
+	  and swap-in (otherwise lost at swap-out and reset at swap-in).
+	  You should pass the "page_owner=on,swap" parameter to enable it.
+
 config PAGE_TABLE_CHECK
 	bool "Check for invalid mappings in user page tables"
 	depends on ARCH_SUPPORTS_PAGE_TABLE_CHECK
-- 
2.51.0