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memcg: reduce size of mem_cgroup by using nr_cpu_ids

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As Jan Blunck <jblunck@suse.de> pointed out, allocating per-cpu stat for
memcg to the size of NR_CPUS is not good.

This patch changes mem_cgroup's cpustat allocation not based on NR_CPUS
but based on nr_cpu_ids.

Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Blunck 2009-01-07 18:07:53 -08:00 committed by Linus Torvalds
parent f817ed4853
commit c8dad2bb63
1 changed files with 18 additions and 17 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

35
mm/memcontrol.c
View file

@ -60,7 +60,7 @@ struct mem_cgroup_stat_cpu {
} ____cacheline_aligned_in_smp;
struct mem_cgroup_stat {
struct mem_cgroup_stat_cpu cpustat[NR_CPUS];
struct mem_cgroup_stat_cpu cpustat[0];
};
/*
@ -129,11 +129,10 @@ struct mem_cgroup {
int prev_priority; /* for recording reclaim priority */
/*
* statistics.
* statistics. This must be placed at the end of memcg.
*/
struct mem_cgroup_stat stat;
};
static struct mem_cgroup init_mem_cgroup;
enum charge_type {
MEM_CGROUP_CHARGE_TYPE_CACHE = 0,
@ -1293,23 +1292,30 @@ static void free_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
kfree(mem->info.nodeinfo[node]);
}
static int mem_cgroup_size(void)
{
int cpustat_size = nr_cpu_ids * sizeof(struct mem_cgroup_stat_cpu);
return sizeof(struct mem_cgroup) + cpustat_size;
}
static struct mem_cgroup *mem_cgroup_alloc(void)
{
struct mem_cgroup *mem;
int size = mem_cgroup_size();
if (sizeof(*mem) < PAGE_SIZE)
mem = kmalloc(sizeof(*mem), GFP_KERNEL);
if (size < PAGE_SIZE)
mem = kmalloc(size, GFP_KERNEL);
else
mem = vmalloc(sizeof(*mem));
mem = vmalloc(size);
if (mem)
memset(mem, 0, sizeof(*mem));
memset(mem, 0, size);
return mem;
}
static void mem_cgroup_free(struct mem_cgroup *mem)
{
if (sizeof(*mem) < PAGE_SIZE)
if (mem_cgroup_size() < PAGE_SIZE)
kfree(mem);
else
vfree(mem);
@ -1322,13 +1328,9 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
struct mem_cgroup *mem;
int node;
if (unlikely((cont->parent) == NULL)) {
mem = &init_mem_cgroup;
} else {
mem = mem_cgroup_alloc();
if (!mem)
return ERR_PTR(-ENOMEM);
}
mem = mem_cgroup_alloc();
if (!mem)
return ERR_PTR(-ENOMEM);
res_counter_init(&mem->res);
@ -1340,8 +1342,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
free_out:
for_each_node_state(node, N_POSSIBLE)
free_mem_cgroup_per_zone_info(mem, node);
if (cont->parent != NULL)
mem_cgroup_free(mem);
mem_cgroup_free(mem);
return ERR_PTR(-ENOMEM);
}