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-rw-r--r--mm/hugetlb_cgroup.c11
-rw-r--r--mm/memcontrol.c110
-rw-r--r--mm/memory-failure.c8
3 files changed, 43 insertions, 86 deletions
diff --git a/mm/hugetlb_cgroup.c b/mm/hugetlb_cgroup.c
index cb00829bb466..595d7fd795e1 100644
--- a/mm/hugetlb_cgroup.c
+++ b/mm/hugetlb_cgroup.c
@@ -30,7 +30,6 @@ struct hugetlb_cgroup {
#define MEMFILE_IDX(val) (((val) >> 16) & 0xffff)
#define MEMFILE_ATTR(val) ((val) & 0xffff)
-struct cgroup_subsys hugetlb_subsys __read_mostly;
static struct hugetlb_cgroup *root_h_cgroup __read_mostly;
static inline
@@ -42,7 +41,7 @@ struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
static inline
struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
{
- return hugetlb_cgroup_from_css(task_css(task, hugetlb_subsys_id));
+ return hugetlb_cgroup_from_css(task_css(task, hugetlb_cgrp_id));
}
static inline bool hugetlb_cgroup_is_root(struct hugetlb_cgroup *h_cg)
@@ -255,7 +254,7 @@ static u64 hugetlb_cgroup_read_u64(struct cgroup_subsys_state *css,
}
static int hugetlb_cgroup_write(struct cgroup_subsys_state *css,
- struct cftype *cft, const char *buffer)
+ struct cftype *cft, char *buffer)
{
int idx, name, ret;
unsigned long long val;
@@ -358,7 +357,7 @@ static void __init __hugetlb_cgroup_file_init(int idx)
cft = &h->cgroup_files[4];
memset(cft, 0, sizeof(*cft));
- WARN_ON(cgroup_add_cftypes(&hugetlb_subsys, h->cgroup_files));
+ WARN_ON(cgroup_add_cftypes(&hugetlb_cgrp_subsys, h->cgroup_files));
return;
}
@@ -402,10 +401,8 @@ void hugetlb_cgroup_migrate(struct page *oldhpage, struct page *newhpage)
return;
}
-struct cgroup_subsys hugetlb_subsys = {
- .name = "hugetlb",
+struct cgroup_subsys hugetlb_cgrp_subsys = {
.css_alloc = hugetlb_cgroup_css_alloc,
.css_offline = hugetlb_cgroup_css_offline,
.css_free = hugetlb_cgroup_css_free,
- .subsys_id = hugetlb_subsys_id,
};
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 5b6b0039f725..dcc8153a1681 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -66,8 +66,8 @@
#include <trace/events/vmscan.h>
-struct cgroup_subsys mem_cgroup_subsys __read_mostly;
-EXPORT_SYMBOL(mem_cgroup_subsys);
+struct cgroup_subsys memory_cgrp_subsys __read_mostly;
+EXPORT_SYMBOL(memory_cgrp_subsys);
#define MEM_CGROUP_RECLAIM_RETRIES 5
static struct mem_cgroup *root_mem_cgroup __read_mostly;
@@ -538,7 +538,7 @@ static inline struct mem_cgroup *mem_cgroup_from_id(unsigned short id)
{
struct cgroup_subsys_state *css;
- css = css_from_id(id - 1, &mem_cgroup_subsys);
+ css = css_from_id(id - 1, &memory_cgrp_subsys);
return mem_cgroup_from_css(css);
}
@@ -1072,7 +1072,7 @@ struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p)
if (unlikely(!p))
return NULL;
- return mem_cgroup_from_css(task_css(p, mem_cgroup_subsys_id));
+ return mem_cgroup_from_css(task_css(p, memory_cgrp_id));
}
struct mem_cgroup *try_get_mem_cgroup_from_mm(struct mm_struct *mm)
@@ -1683,15 +1683,8 @@ static void move_unlock_mem_cgroup(struct mem_cgroup *memcg,
*/
void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
{
- /*
- * protects memcg_name and makes sure that parallel ooms do not
- * interleave
- */
+ /* oom_info_lock ensures that parallel ooms do not interleave */
static DEFINE_MUTEX(oom_info_lock);
- struct cgroup *task_cgrp;
- struct cgroup *mem_cgrp;
- static char memcg_name[PATH_MAX];
- int ret;
struct mem_cgroup *iter;
unsigned int i;
@@ -1701,36 +1694,14 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
mutex_lock(&oom_info_lock);
rcu_read_lock();
- mem_cgrp = memcg->css.cgroup;
- task_cgrp = task_cgroup(p, mem_cgroup_subsys_id);
-
- ret = cgroup_path(task_cgrp, memcg_name, PATH_MAX);
- if (ret < 0) {
- /*
- * Unfortunately, we are unable to convert to a useful name
- * But we'll still print out the usage information
- */
- rcu_read_unlock();
- goto done;
- }
- rcu_read_unlock();
-
- pr_info("Task in %s killed", memcg_name);
+ pr_info("Task in ");
+ pr_cont_cgroup_path(task_cgroup(p, memory_cgrp_id));
+ pr_info(" killed as a result of limit of ");
+ pr_cont_cgroup_path(memcg->css.cgroup);
+ pr_info("\n");
- rcu_read_lock();
- ret = cgroup_path(mem_cgrp, memcg_name, PATH_MAX);
- if (ret < 0) {
- rcu_read_unlock();
- goto done;
- }
rcu_read_unlock();
- /*
- * Continues from above, so we don't need an KERN_ level
- */
- pr_cont(" as a result of limit of %s\n", memcg_name);
-done:
-
pr_info("memory: usage %llukB, limit %llukB, failcnt %llu\n",
res_counter_read_u64(&memcg->res, RES_USAGE) >> 10,
res_counter_read_u64(&memcg->res, RES_LIMIT) >> 10,
@@ -1745,13 +1716,8 @@ done:
res_counter_read_u64(&memcg->kmem, RES_FAILCNT));
for_each_mem_cgroup_tree(iter, memcg) {
- pr_info("Memory cgroup stats");
-
- rcu_read_lock();
- ret = cgroup_path(iter->css.cgroup, memcg_name, PATH_MAX);
- if (!ret)
- pr_cont(" for %s", memcg_name);
- rcu_read_unlock();
+ pr_info("Memory cgroup stats for ");
+ pr_cont_cgroup_path(iter->css.cgroup);
pr_cont(":");
for (i = 0; i < MEM_CGROUP_STAT_NSTATS; i++) {
@@ -3401,7 +3367,7 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
struct kmem_cache *s)
{
struct kmem_cache *new = NULL;
- static char *tmp_name = NULL;
+ static char *tmp_path = NULL, *tmp_name = NULL;
static DEFINE_MUTEX(mutex); /* protects tmp_name */
BUG_ON(!memcg_can_account_kmem(memcg));
@@ -3413,18 +3379,20 @@ static struct kmem_cache *memcg_create_kmem_cache(struct mem_cgroup *memcg,
* This static temporary buffer is used to prevent from
* pointless shortliving allocation.
*/
- if (!tmp_name) {
- tmp_name = kmalloc(PATH_MAX, GFP_KERNEL);
+ if (!tmp_path || !tmp_name) {
+ if (!tmp_path)
+ tmp_path = kmalloc(PATH_MAX, GFP_KERNEL);
if (!tmp_name)
+ tmp_name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
+ if (!tmp_path || !tmp_name)
goto out;
}
- rcu_read_lock();
- snprintf(tmp_name, PATH_MAX, "%s(%d:%s)", s->name,
- memcg_cache_id(memcg), cgroup_name(memcg->css.cgroup));
- rcu_read_unlock();
+ cgroup_name(memcg->css.cgroup, tmp_name, NAME_MAX + 1);
+ snprintf(tmp_path, PATH_MAX, "%s(%d:%s)", s->name,
+ memcg_cache_id(memcg), tmp_name);
- new = kmem_cache_create_memcg(memcg, tmp_name, s->object_size, s->align,
+ new = kmem_cache_create_memcg(memcg, tmp_path, s->object_size, s->align,
(s->flags & ~SLAB_PANIC), s->ctor, s);
if (new)
new->allocflags |= __GFP_KMEMCG;
@@ -4990,7 +4958,7 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg)
struct cgroup *cgrp = memcg->css.cgroup;
/* returns EBUSY if there is a task or if we come here twice. */
- if (cgroup_task_count(cgrp) || !list_empty(&cgrp->children))
+ if (cgroup_has_tasks(cgrp) || !list_empty(&cgrp->children))
return -EBUSY;
/* we call try-to-free pages for make this cgroup empty */
@@ -5172,7 +5140,7 @@ static int __memcg_activate_kmem(struct mem_cgroup *memcg,
* of course permitted.
*/
mutex_lock(&memcg_create_mutex);
- if (cgroup_task_count(memcg->css.cgroup) || memcg_has_children(memcg))
+ if (cgroup_has_tasks(memcg->css.cgroup) || memcg_has_children(memcg))
err = -EBUSY;
mutex_unlock(&memcg_create_mutex);
if (err)
@@ -5274,7 +5242,7 @@ static int memcg_update_kmem_limit(struct mem_cgroup *memcg,
* RES_LIMIT.
*/
static int mem_cgroup_write(struct cgroup_subsys_state *css, struct cftype *cft,
- const char *buffer)
+ char *buffer)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
enum res_type type;
@@ -6095,7 +6063,7 @@ static void memcg_event_ptable_queue_proc(struct file *file,
* Interpretation of args is defined by control file implementation.
*/
static int memcg_write_event_control(struct cgroup_subsys_state *css,
- struct cftype *cft, const char *buffer)
+ struct cftype *cft, char *buffer)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_event *event;
@@ -6183,17 +6151,15 @@ static int memcg_write_event_control(struct cgroup_subsys_state *css,
* automatically removed on cgroup destruction but the removal is
* asynchronous, so take an extra ref on @css.
*/
- rcu_read_lock();
-
+ cfile_css = css_tryget_from_dir(cfile.file->f_dentry->d_parent,
+ &memory_cgrp_subsys);
ret = -EINVAL;
- cfile_css = css_from_dir(cfile.file->f_dentry->d_parent,
- &mem_cgroup_subsys);
- if (cfile_css == css && css_tryget(css))
- ret = 0;
-
- rcu_read_unlock();
- if (ret)
+ if (IS_ERR(cfile_css))
+ goto out_put_cfile;
+ if (cfile_css != css) {
+ css_put(cfile_css);
goto out_put_cfile;
+ }
ret = event->register_event(memcg, event->eventfd, buffer);
if (ret)
@@ -6566,11 +6532,11 @@ mem_cgroup_css_online(struct cgroup_subsys_state *css)
* unfortunate state in our controller.
*/
if (parent != root_mem_cgroup)
- mem_cgroup_subsys.broken_hierarchy = true;
+ memory_cgrp_subsys.broken_hierarchy = true;
}
mutex_unlock(&memcg_create_mutex);
- return memcg_init_kmem(memcg, &mem_cgroup_subsys);
+ return memcg_init_kmem(memcg, &memory_cgrp_subsys);
}
/*
@@ -7272,9 +7238,7 @@ static void mem_cgroup_bind(struct cgroup_subsys_state *root_css)
mem_cgroup_from_css(root_css)->use_hierarchy = true;
}
-struct cgroup_subsys mem_cgroup_subsys = {
- .name = "memory",
- .subsys_id = mem_cgroup_subsys_id,
+struct cgroup_subsys memory_cgrp_subsys = {
.css_alloc = mem_cgroup_css_alloc,
.css_online = mem_cgroup_css_online,
.css_offline = mem_cgroup_css_offline,
@@ -7300,7 +7264,7 @@ __setup("swapaccount=", enable_swap_account);
static void __init memsw_file_init(void)
{
- WARN_ON(cgroup_add_cftypes(&mem_cgroup_subsys, memsw_cgroup_files));
+ WARN_ON(cgroup_add_cftypes(&memory_cgrp_subsys, memsw_cgroup_files));
}
static void __init enable_swap_cgroup(void)
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 90002ea43638..35ef28acf137 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -145,14 +145,10 @@ static int hwpoison_filter_task(struct page *p)
return -EINVAL;
css = mem_cgroup_css(mem);
- /* root_mem_cgroup has NULL dentries */
- if (!css->cgroup->dentry)
- return -EINVAL;
-
- ino = css->cgroup->dentry->d_inode->i_ino;
+ ino = cgroup_ino(css->cgroup);
css_put(css);
- if (ino != hwpoison_filter_memcg)
+ if (!ino || ino != hwpoison_filter_memcg)
return -EINVAL;
return 0;
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