diff options
| -rw-r--r-- | init/Kconfig | 1 | ||||
| -rw-r--r-- | mm/memcontrol.c | 126 |
2 files changed, 124 insertions, 3 deletions
diff --git a/init/Kconfig b/init/Kconfig index 675d8a2326cf..19ccb33c99d9 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -882,6 +882,7 @@ config MEMCG_SWAP_ENABLED config MEMCG_KMEM bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)" depends on MEMCG && EXPERIMENTAL + depends on SLUB || SLAB default n help The Kernel Memory extension for Memory Resource Controller can limit diff --git a/mm/memcontrol.c b/mm/memcontrol.c index c7b0b1b803a5..bba1cb4bbb82 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -268,6 +268,10 @@ struct mem_cgroup { }; /* + * 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. */ @@ -282,6 +286,7 @@ struct mem_cgroup { * Should the accounting and control be hierarchical, per subtree? */ bool use_hierarchy; + unsigned long kmem_account_flags; /* See KMEM_ACCOUNTED_*, below */ bool oom_lock; atomic_t under_oom; @@ -334,6 +339,20 @@ struct mem_cgroup { #endif }; +/* internal only representation about the status of kmem accounting. */ +enum { + KMEM_ACCOUNTED_ACTIVE = 0, /* accounted by this cgroup itself */ +}; + +#define KMEM_ACCOUNTED_MASK (1 << KMEM_ACCOUNTED_ACTIVE) + +#ifdef CONFIG_MEMCG_KMEM +static inline void memcg_kmem_set_active(struct mem_cgroup *memcg) +{ + set_bit(KMEM_ACCOUNTED_ACTIVE, &memcg->kmem_account_flags); +} +#endif + /* Stuffs for move charges at task migration. */ /* * Types of charges to be moved. "move_charge_at_immitgrate" is treated as a @@ -392,6 +411,7 @@ enum res_type { _MEM, _MEMSWAP, _OOM_TYPE, + _KMEM, }; #define MEMFILE_PRIVATE(x, val) ((x) << 16 | (val)) @@ -1456,6 +1476,10 @@ 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)); } /* @@ -3977,6 +4001,9 @@ static ssize_t 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(); } @@ -3984,6 +4011,59 @@ static ssize_t mem_cgroup_read(struct cgroup *cont, struct cftype *cft, len = scnprintf(str, sizeof(str), "%llu\n", (unsigned long long)val); return simple_read_from_buffer(buf, nbytes, ppos, str, len); } + +static int memcg_update_kmem_limit(struct cgroup *cont, u64 val) +{ + int ret = -EINVAL; +#ifdef CONFIG_MEMCG_KMEM + struct mem_cgroup *memcg = mem_cgroup_from_cont(cont); + /* + * For simplicity, we won't allow this to be disabled. It also can't + * be changed if the cgroup has children already, or if tasks had + * already joined. + * + * If tasks join before we set the limit, a person looking at + * kmem.usage_in_bytes will have no way to determine when it took + * place, which makes the value quite meaningless. + * + * After it first became limited, changes in the value of the limit are + * of course permitted. + * + * Taking the cgroup_lock is really offensive, but it is so far the only + * way to guarantee that no children will appear. There are plenty of + * other offenders, and they should all go away. Fine grained locking + * is probably the way to go here. When we are fully hierarchical, we + * can also get rid of the use_hierarchy check. + */ + cgroup_lock(); + mutex_lock(&set_limit_mutex); + if (!memcg->kmem_account_flags && val != RESOURCE_MAX) { + if (cgroup_task_count(cont) || (memcg->use_hierarchy && + !list_empty(&cont->children))) { + ret = -EBUSY; + goto out; + } + ret = res_counter_set_limit(&memcg->kmem, val); + VM_BUG_ON(ret); + + memcg_kmem_set_active(memcg); + } else + ret = res_counter_set_limit(&memcg->kmem, val); +out: + mutex_unlock(&set_limit_mutex); + cgroup_unlock(); +#endif + return ret; +} + +static void memcg_propagate_kmem(struct mem_cgroup *memcg) +{ + struct mem_cgroup *parent = parent_mem_cgroup(memcg); + if (!parent) + return; + memcg->kmem_account_flags = parent->kmem_account_flags; +} + /* * The user of this function is... * RES_LIMIT. @@ -4015,8 +4095,12 @@ 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) + ret = memcg_update_kmem_limit(cont, val); + else + return -EINVAL; break; case RES_SOFT_LIMIT: ret = res_counter_memparse_write_strategy(buffer, &val); @@ -4082,14 +4166,22 @@ static int mem_cgroup_reset(struct cgroup *cont, unsigned int event) case RES_MAX_USAGE: if (type == _MEM) res_counter_reset_max(&memcg->res); - else + else if (type == _MEMSWAP) res_counter_reset_max(&memcg->memsw); + else if (type == _KMEM) + res_counter_reset_max(&memcg->kmem); + else + return -EINVAL; break; case RES_FAILCNT: if (type == _MEM) res_counter_reset_failcnt(&memcg->res); - else + else if (type == _MEMSWAP) res_counter_reset_failcnt(&memcg->memsw); + else if (type == _KMEM) + res_counter_reset_failcnt(&memcg->kmem); + else + return -EINVAL; break; } @@ -4651,6 +4743,7 @@ static int mem_cgroup_oom_control_write(struct cgroup *cgrp, #ifdef CONFIG_MEMCG_KMEM static int memcg_init_kmem(struct mem_cgroup *memcg, struct cgroup_subsys *ss) { + memcg_propagate_kmem(memcg); return mem_cgroup_sockets_init(memcg, ss); }; @@ -4765,6 +4858,31 @@ static struct cftype mem_cgroup_files[] = { .read = mem_cgroup_read, }, #endif +#ifdef CONFIG_MEMCG_KMEM + { + .name = "kmem.limit_in_bytes", + .private = MEMFILE_PRIVATE(_KMEM, RES_LIMIT), + .write_string = mem_cgroup_write, + .read = mem_cgroup_read, + }, + { + .name = "kmem.usage_in_bytes", + .private = MEMFILE_PRIVATE(_KMEM, RES_USAGE), + .read = mem_cgroup_read, + }, + { + .name = "kmem.failcnt", + .private = MEMFILE_PRIVATE(_KMEM, RES_FAILCNT), + .trigger = mem_cgroup_reset, + .read = mem_cgroup_read, + }, + { + .name = "kmem.max_usage_in_bytes", + .private = MEMFILE_PRIVATE(_KMEM, RES_MAX_USAGE), + .trigger = mem_cgroup_reset, + .read = mem_cgroup_read, + }, +#endif { }, /* terminate */ }; @@ -5010,6 +5128,7 @@ mem_cgroup_css_alloc(struct cgroup *cont) if (parent && parent->use_hierarchy) { res_counter_init(&memcg->res, &parent->res); res_counter_init(&memcg->memsw, &parent->memsw); + res_counter_init(&memcg->kmem, &parent->kmem); /* * We increment refcnt of the parent to ensure that we can * safely access it on res_counter_charge/uncharge. @@ -5020,6 +5139,7 @@ mem_cgroup_css_alloc(struct cgroup *cont) } else { res_counter_init(&memcg->res, NULL); res_counter_init(&memcg->memsw, NULL); + res_counter_init(&memcg->kmem, NULL); /* * Deeper hierachy with use_hierarchy == false doesn't make * much sense so let cgroup subsystem know about this |