---

yaml --- r: 144375 b: refs/heads/master c: 9e4a5bd h: refs/heads/master i: 144373: 2e8275a 144371: 3f27fea 144367: a054394 v: v3
git-mirror · May 2, 2009 · c6eb5d9 · c6eb5d9
1 parent 6c47a6a
commit c6eb5d9
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Showing 3 changed files with 9 additions and 2 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8713e01295140f674a41f2199b0f7ca99dfb69d5
+refs/heads/master: 9e4a5bda89034502fb144331e71a0efdfd5fae97
diff --git a/trunk/Documentation/sysctl/vm.txt b/trunk/Documentation/sysctl/vm.txt
@@ -90,6 +90,10 @@ will itself start writeback.
 If dirty_bytes is written, dirty_ratio becomes a function of its value
 (dirty_bytes / the amount of dirtyable system memory).
 
+Note: the minimum value allowed for dirty_bytes is two pages (in bytes); any
+value lower than this limit will be ignored and the old configuration will be
+retained.
+
 ==============================================================
 
 dirty_expire_centisecs

diff --git a/trunk/kernel/sysctl.c b/trunk/kernel/sysctl.c
@@ -103,6 +103,9 @@ static unsigned long one_ul = 1;
 static int one_hundred = 100;
 static int one_thousand = 1000;
 
+/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
+static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
+
 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 static int maxolduid = 65535;
 static int minolduid;
@@ -1006,7 +1009,7 @@ static struct ctl_table vm_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &dirty_bytes_handler,
 		.strategy	= &sysctl_intvec,
-		.extra1		= &one_ul,
+		.extra1		= &dirty_bytes_min,
 	},
 	{
 		.procname	= "dirty_writeback_centisecs",