[PATCH] vm thrashing control tuning

This patch adds "swap_token_timeout" parameter in /proc/sys/vm.  The
parameter means expired time of token.  Unit of the value is HZ, and the
default value is the same as current SWAP_TOKEN_TIMEOUT (i.e.  HZ * 300).

Signed-off-by: Hideo Aoki <aoki@sdl.hitachi.co.jp>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 80bf15f035cde2..fed8d5a8aa626c 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -783,6 +783,7 @@ static ctl_table vm_table[] = {
 		.strategy	= &sysctl_intvec,
 		.extra1		= &zero,
 	},
+#ifdef CONFIG_SWAP
 	{
 		.ctl_name	= VM_VFS_CACHE_PRESSURE,
 		.procname	= "vfs_cache_pressure",
@@ -805,6 +806,15 @@ static ctl_table vm_table[] = {
 		.extra1		= &zero,
 	},
 #endif
+	{
+		.ctl_name	= VM_SWAP_TOKEN_TIMEOUT,
+		.procname	= "swap_token_timeout",
+		.data		= &swap_token_default_timeout,
+		.maxlen		= sizeof(swap_token_default_timeout),
+		.mode		= 0644,
+		.proc_handler	= &proc_dointvec_jiffies,
+		.strategy	= &sysctl_jiffies,
+	},
 	{ .ctl_name = 0 }
 };
 
@@ -915,6 +925,7 @@ static ctl_table fs_table[] = {
 		.mode		= 0644,
 		.proc_handler	= &proc_dointvec,
 	},
+#endif
 	{ .ctl_name = 0 }
 };