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authorMichal Hocko <mhocko@suse.cz>2011-02-02 02:52:31 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-02-03 03:03:18 +0300
commit552b372ba9db85751e7db2998f07cca2e51f5865 (patch)
tree9d3aed4ed1959aeedc05be5436910ced5afc6928
parentfceda1bf498677501befc7da72fd2e4de7f18466 (diff)
downloadlinux-552b372ba9db85751e7db2998f07cca2e51f5865.tar.xz
memsw: deprecate noswapaccount kernel parameter and schedule it for removal
noswapaccount couldn't be used to control memsw for both on/off cases so we have added swapaccount[=0|1] parameter. This way we can turn the feature in two ways noswapaccount resp. swapaccount=0. We have kept the original noswapaccount but I think we should remove it after some time as it just makes more command line parameters without any advantages and also the code to handle parameters is uglier if we want both parameters. Signed-off-by: Michal Hocko <mhocko@suse.cz> Requested-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--Documentation/feature-removal-schedule.txt16
-rw-r--r--mm/memcontrol.c1
2 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index b959659c5df4..b3f35e5f9c95 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -603,3 +603,19 @@ Why: The adm9240, w83792d and w83793 hardware monitoring drivers have
Who: Jean Delvare <khali@linux-fr.org>
----------------------------
+
+What: noswapaccount kernel command line parameter
+When: 2.6.40
+Why: The original implementation of memsw feature enabled by
+ CONFIG_CGROUP_MEM_RES_CTLR_SWAP could be disabled by the noswapaccount
+ kernel parameter (introduced in 2.6.29-rc1). Later on, this decision
+ turned out to be not ideal because we cannot have the feature compiled
+ in and disabled by default and let only interested to enable it
+ (e.g. general distribution kernels might need it). Therefore we have
+ added swapaccount[=0|1] parameter (introduced in 2.6.37) which provides
+ the both possibilities. If we remove noswapaccount we will have
+ less command line parameters with the same functionality and we
+ can also cleanup the parameter handling a bit ().
+Who: Michal Hocko <mhocko@suse.cz>
+
+----------------------------
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 44f9f9c89f0c..79abb1fd39d2 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5034,6 +5034,7 @@ __setup("swapaccount", enable_swap_account);
static int __init disable_swap_account(char *s)
{
+ printk_once("noswapaccount is deprecated and will be removed in 2.6.40. Use swapaccount=0 instead\n");
enable_swap_account("=0");
return 1;
}