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cgroup: Add kernel param to enable memory group

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cgroup support is useful, but enabling the "memory" cgroup has a 32-byte
overhead per page. Arrange that "memory" cgroup is disabled by default
unless the "cgroup_memory" parameter is set to a true value.

See: https://github.com/raspberrypi/issues/1950

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2017-09-18 12:01:46 +01:00
committed by popcornmix
parent b169647170
commit e74571f978
1 changed files with 12 additions and 0 deletions
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12
kernel/cgroup.c
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@@ -5638,6 +5638,8 @@ int __init cgroup_init_early(void)
}
static u16 cgroup_disable_mask __initdata;
static bool cgroup_enable_memory;
static int __init cgroup_disable(char *str);
/**
* cgroup_init - cgroup initialization
@@ -5676,6 +5678,9 @@ int __init cgroup_init(void)
mutex_unlock(&cgroup_mutex);
if (!cgroup_enable_memory)
cgroup_disable("memory");
for_each_subsys(ss, ssid) {
if (ss->early_init) {
struct cgroup_subsys_state *css =
@@ -6151,6 +6156,13 @@ static int __init cgroup_disable(char *str)
}
__setup("cgroup_disable=", cgroup_disable);
static int __init cgroup_memory(char *str)
{
kstrtobool(str, &cgroup_enable_memory);
return 1;
}
__setup("cgroup_memory=", cgroup_memory);
static int __init cgroup_no_v1(char *str)
{
struct cgroup_subsys *ss;