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Subject[RFC][PATCH 5/5] memcg: drain per cpu stock

Add function for dropping per-cpu stock of charges.
This is called when
- cpu is unplugged.
- force_empty
- recalim seems to be not easy.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
---
mm/memcontrol.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 70 insertions(+), 1 deletion(-)
Index: mmotm-2.6.31-Aug27/mm/memcontrol.c
===================================================================
--- mmotm-2.6.31-Aug27.orig/mm/memcontrol.c
+++ mmotm-2.6.31-Aug27/mm/memcontrol.c
@@ -38,6 +38,8 @@
#include <linux/vmalloc.h>
#include <linux/mm_inline.h>
#include <linux/page_cgroup.h>
+#include <linux/notifier.h>
+#include <linux/cpu.h>
#include "internal.h"

#include <asm/uaccess.h>
@@ -77,6 +79,8 @@ enum mem_cgroup_stat_index {

struct mem_cgroup_stat_cpu {
s64 count[MEM_CGROUP_STAT_NSTATS];
+ struct work_struct work;
+ struct mem_cgroup *mem;
} ____cacheline_aligned_in_smp;

struct mem_cgroup_stat {
@@ -277,6 +281,7 @@ enum charge_type {
static void mem_cgroup_get(struct mem_cgroup *mem);
static void mem_cgroup_put(struct mem_cgroup *mem);
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
+static void schedule_drain_stock_all(struct mem_cgroup *mem, bool sync);

static struct mem_cgroup_per_zone *
mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
@@ -1195,6 +1200,9 @@ static int mem_cgroup_hierarchical_recla
return total;
} else if (mem_cgroup_check_under_limit(root_mem))
return 1 + total;
+
+ if (loop > 0)
+ schedule_drain_stock_all(victim, false);
}
return total;
}
@@ -1292,6 +1300,48 @@ void do_local_stock(struct mem_cgroup *m
put_cpu();
}

+/* called by cpu hotplug and workqueue */
+int force_drain_local_stock(struct mem_cgroup *mem, void *data)
+{
+ struct mem_cgroup_stat_cpu *cstat;
+ int cpu = *(unsigned long *)data;
+ unsigned long stock;
+
+ cstat = &mem->stat.cpustat[cpu];
+ stock = cstat->count[MEM_CGROUP_STAT_STOCK];
+ cstat->count[MEM_CGROUP_STAT_STOCK] = 0;
+ res_counter_uncharge(&mem->res, stock);
+ return 0;
+}
+
+
+void drain_local_stock(struct work_struct *work)
+{
+ struct mem_cgroup_stat_cpu *cstat;
+ struct mem_cgroup *mem;
+ unsigned long cpu;
+
+ cpu = get_cpu();
+ cstat = container_of(work, struct mem_cgroup_stat_cpu, work);
+ mem = cstat->mem;
+ force_drain_local_stock(mem, &cpu);
+ put_cpu();
+}
+
+
+void schedule_drain_stock_all(struct mem_cgroup *mem, bool sync)
+{
+ struct mem_cgroup_stat_cpu *cstat;
+ int cpu;
+
+ for_each_online_cpu(cpu) {
+ cstat = &mem->stat.cpustat[cpu];
+ schedule_work_on(cpu, &cstat->work);
+ if (sync)
+ flush_work(&cstat->work);
+ }
+}
+
/*
* Unlike exported interface, "oom" parameter is added. if oom==true,
* oom-killer can be invoked.
@@ -2471,6 +2521,7 @@ move_account:
if (signal_pending(current))
goto out;
/* This is for making all *used* pages to be on LRU. */
+ schedule_drain_stock_all(mem, true);
lru_add_drain_all();
ret = 0;
for_each_node_state(node, N_HIGH_MEMORY) {
@@ -3081,6 +3132,7 @@ static struct mem_cgroup *mem_cgroup_all
{
struct mem_cgroup *mem;
int size = mem_cgroup_size();
+ int i;

if (size < PAGE_SIZE)
mem = kmalloc(size, GFP_KERNEL);
@@ -3089,9 +3141,26 @@ static struct mem_cgroup *mem_cgroup_all

if (mem)
memset(mem, 0, size);
+ for (i = 0; i < nr_cpu_ids; i++)
+ INIT_WORK(&mem->stat.cpustat[i].work, drain_local_stock);
+
return mem;
}

+static int __cpuinit percpu_memcg_hotcpu_callback(struct notifier_block *nb,
+ unsigned long action, void *hcpu)
+{
+#ifdef CONFIG_HOTPLUG_CPU
+ if (action != CPU_DEAD)
+ return NOTIFY_OK;
+ if (!root_mem_cgroup)
+ return NOTIFY_OK;
+ mem_cgroup_walk_tree(root_mem_cgroup, hcpu, force_drain_local_stock);
+#endif
+ return NOTIFY_OK;
+}
+
+
/*
* At destroying mem_cgroup, references from swap_cgroup can remain.
* (scanning all at force_empty is too costly...)
@@ -3203,7 +3272,7 @@ mem_cgroup_create(struct cgroup_subsys *
root_mem_cgroup = mem;
if (mem_cgroup_soft_limit_tree_init())
goto free_out;
-
+ hotcpu_notifier(percpu_memcg_hotcpu_callback, 0);
} else {
parent = mem_cgroup_from_cont(cont->parent);
mem->use_hierarchy = parent->use_hierarchy;


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