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- From 584bc4a6093ceb9aea07673185ee0084edc8690b Mon Sep 17 00:00:00 2001
- From: Phil Elwell <[email protected]>
- Date: Mon, 27 Nov 2017 17:14:54 +0000
- Subject: [PATCH 136/454] cgroup: Disable cgroup "memory" by default
- Some Raspberry Pis have limited RAM and most users won't use the
- cgroup memory support so it is disabled by default. Enable with:
- cgroup_enable=memory
- See: https://github.com/raspberrypi/linux/issues/1950
- Signed-off-by: Phil Elwell <[email protected]>
- ---
- kernel/cgroup/cgroup.c | 30 ++++++++++++++++++++++++++++++
- 1 file changed, 30 insertions(+)
- --- a/kernel/cgroup/cgroup.c
- +++ b/kernel/cgroup/cgroup.c
- @@ -5162,6 +5162,8 @@ int __init cgroup_init_early(void)
- }
-
- static u16 cgroup_disable_mask __initdata;
- +static u16 cgroup_enable_mask __initdata;
- +static int __init cgroup_disable(char *str);
-
- /**
- * cgroup_init - cgroup initialization
- @@ -5200,6 +5202,12 @@ int __init cgroup_init(void)
-
- mutex_unlock(&cgroup_mutex);
-
- + /* Apply an implicit disable... */
- + cgroup_disable("memory");
- +
- + /* ...knowing that an explicit enable will override it. */
- + cgroup_disable_mask &= ~cgroup_enable_mask;
- +
- for_each_subsys(ss, ssid) {
- if (ss->early_init) {
- struct cgroup_subsys_state *css =
- @@ -5583,6 +5591,28 @@ static int __init cgroup_disable(char *s
- }
- __setup("cgroup_disable=", cgroup_disable);
-
- +static int __init cgroup_enable(char *str)
- +{
- + struct cgroup_subsys *ss;
- + char *token;
- + int i;
- +
- + while ((token = strsep(&str, ",")) != NULL) {
- + if (!*token)
- + continue;
- +
- + for_each_subsys(ss, i) {
- + if (strcmp(token, ss->name) &&
- + strcmp(token, ss->legacy_name))
- + continue;
- +
- + cgroup_enable_mask |= 1 << i;
- + }
- + }
- + return 1;
- +}
- +__setup("cgroup_enable=", cgroup_enable);
- +
- /**
- * css_tryget_online_from_dir - get corresponding css from a cgroup dentry
- * @dentry: directory dentry of interest
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