86 lines
2.2 KiB
Diff
86 lines
2.2 KiB
Diff
From 2b13c54592135b6fab269517ed687fa9f80bf8e5 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] 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 | 38 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 38 insertions(+)
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--- a/kernel/cgroup/cgroup.c
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+++ b/kernel/cgroup/cgroup.c
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@@ -5690,6 +5690,9 @@ int __init cgroup_init_early(void)
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return 0;
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}
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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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/**
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* cgroup_init - cgroup initialization
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*
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@@ -5728,6 +5731,12 @@ int __init cgroup_init(void)
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mutex_unlock(&cgroup_mutex);
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+ /*
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+ * Apply an implicit disable, knowing that an explicit enable will
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+ * prevent if from doing anything.
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+ */
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+ cgroup_disable("memory");
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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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@@ -6265,6 +6274,10 @@ static int __init cgroup_disable(char *s
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strcmp(token, ss->legacy_name))
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continue;
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+ /* An explicit cgroup_enable overrides a disable */
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+ if (cgroup_enable_mask & (1 << i))
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+ continue;
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+
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static_branch_disable(cgroup_subsys_enabled_key[i]);
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pr_info("Disabling %s control group subsystem\n",
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ss->name);
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@@ -6274,6 +6287,31 @@ 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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+ static_branch_enable(cgroup_subsys_enabled_key[i]);
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+ pr_info("Enabling %s control group subsystem\n",
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+ ss->name);
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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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void __init __weak enable_debug_cgroup(void) { }
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static int __init enable_cgroup_debug(char *str)
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