Install the callbacks via the state machine.
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: cgroups@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/cpuhotplug.h | 1 +
mm/memcontrol.c | 24 ++++++++----------------
2 files changed, 9 insertions(+), 16 deletions(-)
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 4174083280d7..c622ab349af3 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -32,6 +32,7 @@ enum cpuhp_state {
CPUHP_BLK_MQ_DEAD,
CPUHP_FS_BUFF_DEAD,
CPUHP_PRINTK_DEAD,
+ CPUHP_MM_MEMCQ_DEAD,
CPUHP_WORKQUEUE_PREP,
CPUHP_POWER_NUMA_PREPARE,
CPUHP_HRTIMERS_PREPARE,
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 0f870ba43942..6c2043509fb5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1816,22 +1816,13 @@ static void drain_all_stock(struct mem_cgroup *root_memcg)
mutex_unlock(&percpu_charge_mutex);
}
-static int memcg_cpu_hotplug_callback(struct notifier_block *nb,
- unsigned long action,
- void *hcpu)
+static int memcg_hotplug_cpu_dead(unsigned int cpu)
{
- int cpu = (unsigned long)hcpu;
struct memcg_stock_pcp *stock;
- if (action == CPU_ONLINE)
- return NOTIFY_OK;
-
- if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
- return NOTIFY_OK;
-
stock = &per_cpu(memcg_stock, cpu);
drain_stock(stock);
- return NOTIFY_OK;
+ return 0;
}
static void reclaim_high(struct mem_cgroup *memcg,
@@ -5774,16 +5765,17 @@ __setup("cgroup.memory=", cgroup_memory);
/*
* subsys_initcall() for memory controller.
*
- * Some parts like hotcpu_notifier() have to be initialized from this context
- * because of lock dependencies (cgroup_lock -> cpu hotplug) but basically
- * everything that doesn't depend on a specific mem_cgroup structure should
- * be initialized from here.
+ * Some parts like memcg_hotplug_cpu_dead() have to be initialized from this
+ * context because of lock dependencies (cgroup_lock -> cpu hotplug) but
+ * basically everything that doesn't depend on a specific mem_cgroup structure
+ * should be initialized from here.
*/
static int __init mem_cgroup_init(void)
{
int cpu, node;
- hotcpu_notifier(memcg_cpu_hotplug_callback, 0);
+ cpuhp_setup_state_nocalls(CPUHP_MM_MEMCQ_DEAD, "mm/memctrl:dead", NULL,
+ memcg_hotplug_cpu_dead);
for_each_possible_cpu(cpu)
INIT_WORK(&per_cpu_ptr(&memcg_stock, cpu)->work,
--
2.10.2
--
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