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Subject[PATCH v2 02/13] memcg: Kernel memory accounting infrastructure.
Date
Enabled with CONFIG_CGROUP_MEM_RES_CTLR_KMEM.

Adds the following files:
- memory.kmem.independent_kmem_limit
- memory.kmem.usage_in_bytes
- memory.kmem.limit_in_bytes

Signed-off-by: Suleiman Souhlal <suleiman@google.com>
---
mm/memcontrol.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 135 insertions(+), 1 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 37ad2cb..e6fd558 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -220,6 +220,10 @@ enum memcg_flags {
*/
MEMCG_MEMSW_IS_MINIMUM, /* Set when res.limit == memsw.limit */
MEMCG_OOM_KILL_DISABLE, /* OOM-Killer disable */
+ MEMCG_INDEPENDENT_KMEM_LIMIT, /*
+ * kernel memory is not counted in
+ * memory.usage_in_bytes
+ */
};

/*
@@ -244,6 +248,10 @@ struct mem_cgroup {
*/
struct res_counter memsw;
/*
+ * the counter to account for kernel memory usage.
+ */
+ struct res_counter kmem;
+ /*
* Per cgroup active and inactive list, similar to the
* per zone LRU lists.
*/
@@ -355,6 +363,7 @@ enum charge_type {
#define _MEM (0)
#define _MEMSWAP (1)
#define _OOM_TYPE (2)
+#define _KMEM (3)
#define MEMFILE_PRIVATE(x, val) (((x) << 16) | (val))
#define MEMFILE_TYPE(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
@@ -371,6 +380,8 @@ enum charge_type {

static void mem_cgroup_get(struct mem_cgroup *memcg);
static void mem_cgroup_put(struct mem_cgroup *memcg);
+static void memcg_kmem_init(struct mem_cgroup *memcg,
+ struct mem_cgroup *parent);

static inline bool
mem_cgroup_test_flag(const struct mem_cgroup *memcg, enum memcg_flags flag)
@@ -1435,6 +1446,10 @@ done:
res_counter_read_u64(&memcg->memsw, RES_USAGE) >> 10,
res_counter_read_u64(&memcg->memsw, RES_LIMIT) >> 10,
res_counter_read_u64(&memcg->memsw, RES_FAILCNT));
+ printk(KERN_INFO "kmem: usage %llukB, limit %llukB, failcnt %llu\n",
+ res_counter_read_u64(&memcg->kmem, RES_USAGE) >> 10,
+ res_counter_read_u64(&memcg->kmem, RES_LIMIT) >> 10,
+ res_counter_read_u64(&memcg->kmem, RES_FAILCNT));
}

/*
@@ -3868,6 +3883,9 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
else
val = res_counter_read_u64(&memcg->memsw, name);
break;
+ case _KMEM:
+ val = res_counter_read_u64(&memcg->kmem, name);
+ break;
default:
BUG();
break;
@@ -3900,8 +3918,15 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
break;
if (type == _MEM)
ret = mem_cgroup_resize_limit(memcg, val);
- else
+ else if (type == _MEMSWAP)
ret = mem_cgroup_resize_memsw_limit(memcg, val);
+ else if (type == _KMEM) {
+ if (!mem_cgroup_test_flag(memcg,
+ MEMCG_INDEPENDENT_KMEM_LIMIT))
+ return -EINVAL;
+ ret = res_counter_set_limit(&memcg->kmem, val);
+ } else
+ return -EINVAL;
break;
case RES_SOFT_LIMIT:
ret = res_counter_memparse_write_strategy(buffer, &val);
@@ -4606,8 +4631,56 @@ static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
#endif /* CONFIG_NUMA */

#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+static u64
+mem_cgroup_independent_kmem_limit_read(struct cgroup *cgrp, struct cftype *cft)
+{
+ return mem_cgroup_test_flag(mem_cgroup_from_cont(cgrp),
+ MEMCG_INDEPENDENT_KMEM_LIMIT);
+}
+
+static int mem_cgroup_independent_kmem_limit_write(struct cgroup *cgrp,
+ struct cftype *cft, u64 val)
+{
+ struct mem_cgroup *memcg;
+
+ memcg = mem_cgroup_from_cont(cgrp);
+ if (val)
+ mem_cgroup_set_flag(memcg, MEMCG_INDEPENDENT_KMEM_LIMIT);
+ else {
+ mem_cgroup_clear_flag(memcg, MEMCG_INDEPENDENT_KMEM_LIMIT);
+ res_counter_set_limit(&memcg->kmem, RESOURCE_MAX);
+ }
+
+ return 0;
+}
+
+static struct cftype kmem_cgroup_files[] = {
+ {
+ .name = "kmem.independent_kmem_limit",
+ .write_u64 = mem_cgroup_independent_kmem_limit_write,
+ .read_u64 = mem_cgroup_independent_kmem_limit_read,
+ },
+ {
+ .name = "kmem.limit_in_bytes",
+ .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT),
+ .write_string = mem_cgroup_write,
+ .read_u64 = mem_cgroup_read,
+ },
+ {
+ .name = "kmem.usage_in_bytes",
+ .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE),
+ .read_u64 = mem_cgroup_read,
+ },
+};
+
static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
{
+ int ret;
+
+ ret = cgroup_add_files(cont, ss, kmem_cgroup_files,
+ ARRAY_SIZE(kmem_cgroup_files));
+ if (ret)
+ return ret;
/*
* Part of this would be better living in a separate allocation
* function, leaving us with just the cgroup tree population work.
@@ -4621,6 +4694,10 @@ static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
static void kmem_cgroup_destroy(struct cgroup_subsys *ss,
struct cgroup *cont)
{
+ struct mem_cgroup *memcg;
+
+ memcg = mem_cgroup_from_cont(cont);
+ BUG_ON(res_counter_read_u64(&memcg->kmem, RES_USAGE) != 0);
mem_cgroup_sockets_destroy(cont, ss);
}
#else
@@ -4980,6 +5057,8 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
}
memcg->last_scanned_node = MAX_NUMNODES;
INIT_LIST_HEAD(&memcg->oom_notify);
+ memcg_kmem_init(memcg, parent && mem_cgroup_test_flag(parent,
+ MEMCG_USE_HIERARCHY) ? parent : NULL);

if (parent)
memcg->swappiness = mem_cgroup_swappiness(parent);
@@ -5561,3 +5640,58 @@ static int __init enable_swap_account(char *s)
__setup("swapaccount=", enable_swap_account);

#endif
+
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+int
+memcg_charge_kmem(struct mem_cgroup *memcg, gfp_t gfp, long long delta)
+{
+ struct res_counter *fail_res;
+ struct mem_cgroup *_memcg;
+ int may_oom, ret;
+
+ may_oom = (gfp & __GFP_WAIT) && (gfp & __GFP_FS) &&
+ !(gfp & __GFP_NORETRY);
+
+ ret = 0;
+
+ _memcg = memcg;
+ if (memcg && !mem_cgroup_test_flag(memcg,
+ MEMCG_INDEPENDENT_KMEM_LIMIT)) {
+ ret = __mem_cgroup_try_charge(NULL, gfp, delta / PAGE_SIZE,
+ &_memcg, may_oom);
+ if (ret == -ENOMEM)
+ return ret;
+ }
+
+ if (memcg && _memcg == memcg)
+ ret = res_counter_charge(&memcg->kmem, delta, &fail_res);
+
+ return ret;
+}
+
+void
+memcg_uncharge_kmem(struct mem_cgroup *memcg, long long delta)
+{
+ if (memcg)
+ res_counter_uncharge(&memcg->kmem, delta);
+
+ if (memcg && !mem_cgroup_test_flag(memcg, MEMCG_INDEPENDENT_KMEM_LIMIT))
+ res_counter_uncharge(&memcg->res, delta);
+}
+
+static void
+memcg_kmem_init(struct mem_cgroup *memcg, struct mem_cgroup *parent)
+{
+ struct res_counter *parent_res;
+
+ parent_res = NULL;
+ if (parent && parent != root_mem_cgroup)
+ parent_res = &parent->kmem;
+ res_counter_init(&memcg->kmem, parent_res);
+}
+#else /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
+static void
+memcg_kmem_init(struct mem_cgroup *memcg, struct mem_cgroup *parent)
+{
+}
+#endif /* CONFIG_CGROUP_MEM_RES_CTLR_KMEM */
--
1.7.7.3


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