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From 584bc4a6093ceb9aea07673185ee0084edc8690b Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 27 Nov 2017 17:14:54 +0000
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Subject: [PATCH 136/454] cgroup: Disable cgroup "memory" by default
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Some Raspberry Pis have limited RAM and most users won't use the
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cgroup memory support so it is disabled by default. Enable with:
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cgroup_enable=memory
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See: https://github.com/raspberrypi/linux/issues/1950
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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kernel/cgroup/cgroup.c | 30 ++++++++++++++++++++++++++++++
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1 file changed, 30 insertions(+)
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--- a/kernel/cgroup/cgroup.c
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+++ b/kernel/cgroup/cgroup.c
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@@ -5207,6 +5207,8 @@ int __init cgroup_init_early(void)
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}
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static u16 cgroup_disable_mask __initdata;
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+static u16 cgroup_enable_mask __initdata;
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+static int __init cgroup_disable(char *str);
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/**
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* cgroup_init - cgroup initialization
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@@ -5245,6 +5247,12 @@ int __init cgroup_init(void)
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mutex_unlock(&cgroup_mutex);
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+ /* Apply an implicit disable... */
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+ cgroup_disable("memory");
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+
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+ /* ...knowing that an explicit enable will override it. */
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+ cgroup_disable_mask &= ~cgroup_enable_mask;
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+
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for_each_subsys(ss, ssid) {
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if (ss->early_init) {
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struct cgroup_subsys_state *css =
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@@ -5636,6 +5644,28 @@ static int __init cgroup_disable(char *s
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}
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__setup("cgroup_disable=", cgroup_disable);
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+static int __init cgroup_enable(char *str)
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+{
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+ struct cgroup_subsys *ss;
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+ char *token;
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+ int i;
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+
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+ while ((token = strsep(&str, ",")) != NULL) {
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+ if (!*token)
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+ continue;
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+
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+ for_each_subsys(ss, i) {
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+ if (strcmp(token, ss->name) &&
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+ strcmp(token, ss->legacy_name))
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+ continue;
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+
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+ cgroup_enable_mask |= 1 << i;
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+ }
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+ }
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+ return 1;
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+}
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+__setup("cgroup_enable=", cgroup_enable);
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+
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/**
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* css_tryget_online_from_dir - get corresponding css from a cgroup dentry
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* @dentry: directory dentry of interest
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