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memcg: clean up swap accounting initialization code 

Memcg swap accounting is currently enabled by enable_swap_cgroup when
the root cgroup is created.  mem_cgroup_init acts as a memcg subsystem
initializer which sounds like a much better place for enable_swap_cgroup
as well.  We already register memsw files from there so it makes a lot
of sense to merge those two into a single enable_swap_cgroup function.

This patch doesn't introduce any semantic changes.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Zhouping Liu <zliu@redhat.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Li Zefan <lizefan@huawei.com>
Cc: CAI Qian <caiqian@redhat.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2013-02-22 16:34:45 -08:00 committed by Linus Torvalds
parent 2d11085e40
commit 6acc8b0251
1 changed files with 12 additions and 18 deletions
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30
mm/memcontrol.c
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@ -6046,18 +6046,6 @@ struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *memcg)
}
EXPORT_SYMBOL(parent_mem_cgroup);
#ifdef CONFIG_MEMCG_SWAP
static void __init enable_swap_cgroup(void)
{
if (!mem_cgroup_disabled() && really_do_swap_account)
do_swap_account = 1;
}
#else
static void __init enable_swap_cgroup(void)
{
}
#endif
static int mem_cgroup_soft_limit_tree_init(void)
{
struct mem_cgroup_tree_per_node *rtpn;
@ -6111,7 +6099,6 @@ mem_cgroup_css_alloc(struct cgroup *cont)
/* root ? */
if (cont->parent == NULL) {
int cpu;
enable_swap_cgroup();
parent = NULL;
if (mem_cgroup_soft_limit_tree_init())
goto free_out;
@ -6800,12 +6787,19 @@ __setup("swapaccount=", enable_swap_account);
static void __init memsw_file_init(void)
{
if (really_do_swap_account)
WARN_ON(cgroup_add_cftypes(&mem_cgroup_subsys,
memsw_cgroup_files));
WARN_ON(cgroup_add_cftypes(&mem_cgroup_subsys, memsw_cgroup_files));
}
static void __init enable_swap_cgroup(void)
{
if (!mem_cgroup_disabled() && really_do_swap_account) {
do_swap_account = 1;
memsw_file_init();
}
}
#else
static void __init memsw_file_init(void)
static void __init enable_swap_cgroup(void)
{
}
#endif
@ -6819,7 +6813,7 @@ static void __init memsw_file_init(void)
static int __init mem_cgroup_init(void)
{
hotcpu_notifier(memcg_cpu_hotplug_callback, 0);
memsw_file_init();
enable_swap_cgroup();
return 0;
}
subsys_initcall(mem_cgroup_init);