target/linux/brcm2708/patches-4.9/950-0060-config-Enable-CONFIG_MEMCG-but-leave-it-disabled-due.patch

   1 From c50fe09c78e9b87137e0188139c774bd4f12dcb2 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Wed, 18 Dec 2013 22:16:19 +0000
   4 Subject: [PATCH] config: Enable CONFIG_MEMCG, but leave it disabled (due to
   5  memory cost). Enable with cgroup_enable=memory.
   6
   7 ---
   8  kernel/cgroup.c | 24 +++++++++++++++++++++++-
   9  1 file changed, 23 insertions(+), 1 deletion(-)
  10
  11 --- a/kernel/cgroup.c
  12 +++ b/kernel/cgroup.c
  13 @@ -5626,7 +5626,7 @@ int __init cgroup_init_early(void)
  14         return 0;
  15  }
  16
  17 -static u16 cgroup_disable_mask __initdata;
  18 +static u16 cgroup_disable_mask __initdata = 1<<0;
  19
  20  /**
  21   * cgroup_init - cgroup initialization
  22 @@ -6163,6 +6163,28 @@ static int __init cgroup_no_v1(char *str
  23  }
  24  __setup("cgroup_no_v1=", cgroup_no_v1);
  25
  26 +static int __init cgroup_enable(char *str)
  27 +{
  28 +       struct cgroup_subsys *ss;
  29 +       char *token;
  30 +       int i;
  31 +
  32 +       while ((token = strsep(&str, ",")) != NULL) {
  33 +               if (!*token)
  34 +                       continue;
  35 +
  36 +               for_each_subsys(ss, i) {
  37 +                       if (strcmp(token, ss->name) &&
  38 +                           strcmp(token, ss->legacy_name))
  39 +                               continue;
  40 +
  41 +                       cgroup_disable_mask &= ~(1 << i);
  42 +               }
  43 +       }
  44 +       return 1;
  45 +}
  46 +__setup("cgroup_enable=", cgroup_enable);
  47 +
  48  /**
  49   * css_tryget_online_from_dir - get corresponding css from a cgroup dentry
  50   * @dentry: directory dentry of interest