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-rw-r--r--mm/memcontrol.c115
1 files changed, 52 insertions, 63 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 7685d4a0b3c..f342778a0c0 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -3873,14 +3873,21 @@ static inline u64 mem_cgroup_usage(struct mem_cgroup *memcg, bool swap)
return val << PAGE_SHIFT;
}
-static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
+static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft,
+ struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
+ char str[64];
u64 val;
- int type, name;
+ int type, name, len;
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
+
+ if (!do_swap_account && type == _MEMSWAP)
+ return -EOPNOTSUPP;
+
switch (type) {
case _MEM:
if (name == RES_USAGE)
@@ -3897,7 +3904,9 @@ static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
default:
BUG();
}
- return val;
+
+ len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val);
+ return simple_read_from_buffer(buf, nbytes, ppos, str, len);
}
/*
* The user of this function is...
@@ -3913,6 +3922,10 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
type = MEMFILE_TYPE(cft->private);
name = MEMFILE_ATTR(cft->private);
+
+ if (!do_swap_account && type == _MEMSWAP)
+ return -EOPNOTSUPP;
+
switch (name) {
case RES_LIMIT:
if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */
@@ -3978,12 +3991,15 @@ out:
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
{
- struct mem_cgroup *memcg;
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
int type, name;
- memcg = mem_cgroup_from_cont(cont);
type = MEMFILE_TYPE(event);
name = MEMFILE_ATTR(event);
+
+ if (!do_swap_account && type == _MEMSWAP)
+ return -EOPNOTSUPP;
+
switch (name) {
case RES_MAX_USAGE:
if (type == _MEM)
@@ -4624,29 +4640,22 @@ static int mem_control_numa_stat_open(struct inode *unused, struct file *file)
#endif /* CONFIG_NUMA */
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
-static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
- /*
- * Part of this would be better living in a separate allocation
- * function, leaving us with just the cgroup tree population work.
- * We, however, depend on state such as network's proto_list that
- * is only initialized after cgroup creation. I found the less
- * cumbersome way to deal with it to defer it all to populate time
- */
- return mem_cgroup_sockets_init(cont, ss);
+ return mem_cgroup_sockets_init(memcg, ss);
};
-static void kmem_cgroup_destroy(struct cgroup *cont)
+static void kmem_cgroup_destroy(struct mem_cgroup *memcg)
{
- mem_cgroup_sockets_destroy(cont);
+ mem_cgroup_sockets_destroy(memcg);
}
#else
-static int register_kmem_files(struct cgroup *cont, struct cgroup_subsys *ss)
+static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss)
{
return 0;
}
-static void kmem_cgroup_destroy(struct cgroup *cont)
+static void kmem_cgroup_destroy(struct mem_cgroup *memcg)
{
}
#endif
@@ -4655,7 +4664,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_USAGE),
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
.register_event = mem_cgroup_usage_register_event,
.unregister_event = mem_cgroup_usage_unregister_event,
},
@@ -4663,25 +4672,25 @@ static struct cftype mem_cgroup_files[] = {
.name = "max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
{
.name = "limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_LIMIT),
.write_string = mem_cgroup_write,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
{
.name = "soft_limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_SOFT_LIMIT),
.write_string = mem_cgroup_write,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
{
.name = "failcnt",
.private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT),
.trigger = mem_cgroup_reset,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
{
.name = "stat",
@@ -4721,14 +4730,11 @@ static struct cftype mem_cgroup_files[] = {
.mode = S_IRUGO,
},
#endif
-};
-
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
-static struct cftype memsw_cgroup_files[] = {
{
.name = "memsw.usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_USAGE),
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
.register_event = mem_cgroup_usage_register_event,
.unregister_event = mem_cgroup_usage_unregister_event,
},
@@ -4736,35 +4742,23 @@ static struct cftype memsw_cgroup_files[] = {
.name = "memsw.max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
{
.name = "memsw.limit_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_LIMIT),
.write_string = mem_cgroup_write,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
{
.name = "memsw.failcnt",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT),
.trigger = mem_cgroup_reset,
- .read_u64 = mem_cgroup_read,
+ .read = mem_cgroup_read,
},
-};
-
-static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
-{
- if (!do_swap_account)
- return 0;
- return cgroup_add_files(cont, ss, memsw_cgroup_files,
- ARRAY_SIZE(memsw_cgroup_files));
-};
-#else
-static int register_memsw_files(struct cgroup *cont, struct cgroup_subsys *ss)
-{
- return 0;
-}
#endif
+ { }, /* terminate */
+};
static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *memcg, int node)
{
@@ -5016,6 +5010,17 @@ mem_cgroup_create(struct cgroup *cont)
memcg->move_charge_at_immigrate = 0;
mutex_init(&memcg->thresholds_lock);
spin_lock_init(&memcg->move_lock);
+
+ error = memcg_init_kmem(memcg, &mem_cgroup_subsys);
+ if (error) {
+ /*
+ * We call put now because our (and parent's) refcnts
+ * are already in place. mem_cgroup_put() will internally
+ * call __mem_cgroup_free, so return directly
+ */
+ mem_cgroup_put(memcg);
+ return ERR_PTR(error);
+ }
return &memcg->css;
free_out:
__mem_cgroup_free(memcg);
@@ -5033,28 +5038,11 @@ static void mem_cgroup_destroy(struct cgroup *cont)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cont);
- kmem_cgroup_destroy(cont);
+ kmem_cgroup_destroy(memcg);
mem_cgroup_put(memcg);
}
-static int mem_cgroup_populate(struct cgroup_subsys *ss,
- struct cgroup *cont)
-{
- int ret;
-
- ret = cgroup_add_files(cont, ss, mem_cgroup_files,
- ARRAY_SIZE(mem_cgroup_files));
-
- if (!ret)
- ret = register_memsw_files(cont, ss);
-
- if (!ret)
- ret = register_kmem_files(cont, ss);
-
- return ret;
-}
-
#ifdef CONFIG_MMU
/* Handlers for move charge at task migration. */
#define PRECHARGE_COUNT_AT_ONCE 256
@@ -5638,12 +5626,13 @@ struct cgroup_subsys mem_cgroup_subsys = {
.create = mem_cgroup_create,
.pre_destroy = mem_cgroup_pre_destroy,
.destroy = mem_cgroup_destroy,
- .populate = mem_cgroup_populate,
.can_attach = mem_cgroup_can_attach,
.cancel_attach = mem_cgroup_cancel_attach,
.attach = mem_cgroup_move_task,
+ .base_cftypes = mem_cgroup_files,
.early_init = 0,
.use_id = 1,
+ .__DEPRECATED_clear_css_refs = true,
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-21 01:57:45 +0000