linux-kernel - [v5][PATCH 4/6] mm: vmscan: break out mapping "freepage" code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 03 Jun 2013 13:02:07 -0700
From:	Dave Hansen <dave@...1.net>
To:	linux-mm@...ck.org
Cc:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mgorman@...e.de, tim.c.chen@...ux.intel.com, minchan@...nel.org,
	Dave Hansen <dave@...1.net>
Subject: [v5][PATCH 4/6] mm: vmscan: break out mapping "freepage" code


From: Dave Hansen <dave.hansen@...ux.intel.com>

__remove_mapping() only deals with pages with mappings, meaning
page cache and swap cache.

At this point, the page has been removed from the mapping's radix
tree, and we need to ensure that any fs-specific (or swap-
specific) resources are freed up.

We will be using this function from a second location in a
following patch.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
Acked-by: Mel Gorman <mgorman@...e.de>
Reviewed-by: Minchan Kim <minchan@...nel.org>
---

 linux.git-davehans/mm/vmscan.c |   27 ++++++++++++++++++---------
 1 file changed, 18 insertions(+), 9 deletions(-)

diff -puN mm/vmscan.c~free_mapping_page mm/vmscan.c
--- linux.git/mm/vmscan.c~free_mapping_page	2013-06-03 12:41:31.155740124 -0700
+++ linux.git-davehans/mm/vmscan.c	2013-06-03 12:41:31.159740301 -0700
@@ -496,6 +496,23 @@ static int __remove_mapping(struct addre
 	return 1;
 }
 
+/*
+ * Release any resources the mapping had tied up in the page.
+ */
+static void mapping_release_page(struct address_space *mapping,
+				 struct page *page)
+{
+	if (PageSwapCache(page)) {
+		swapcache_free_page_entry(page);
+	} else {
+		void (*freepage)(struct page *);
+		freepage = mapping->a_ops->freepage;
+		mem_cgroup_uncharge_cache_page(page);
+		if (freepage != NULL)
+			freepage(page);
+	}
+}
+
 static int lock_remove_mapping(struct address_space *mapping, struct page *page)
 {
 	int ret;
@@ -509,15 +526,7 @@ static int lock_remove_mapping(struct ad
 	if (!ret)
 		return 0;
 
-	if (PageSwapCache(page)) {
-		swapcache_free_page_entry(page);
-	} else {
-		void (*freepage)(struct page *);
-		freepage = mapping->a_ops->freepage;
-		mem_cgroup_uncharge_cache_page(page);
-		if (freepage != NULL)
-			freepage(page);
-	}
+	mapping_release_page(mapping, page);
 	return ret;
 }
 
_
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/