struct cgroup_subsys mem_cgroup_subsys __read_mostly;
#define MEM_CGROUP_RECLAIM_RETRIES 5
-struct mem_cgroup *root_mem_cgroup __read_mostly;
+static struct mem_cgroup *root_mem_cgroup __read_mostly;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
/* Turned on only when memory cgroup is enabled && really_do_swap_account = 1 */
struct mem_cgroup_reclaim_iter reclaim_iter[DEF_PRIORITY + 1];
- struct zone_reclaim_stat reclaim_stat;
struct rb_node tree_node; /* RB tree node */
unsigned long long usage_in_excess;/* Set to the value by which */
/* the soft limit is exceeded*/
mz->lru_size[lru] -= 1 << compound_order(page);
}
-void mem_cgroup_lru_del(struct page *page)
-{
- mem_cgroup_lru_del_list(page, page_lru(page));
-}
-
/**
* mem_cgroup_lru_move_lists - account for moving a page between lrus
* @zone: zone of the page
* Checks whether given mem is same or in the root_mem_cgroup's
* hierarchy subtree
*/
+bool __mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
+ struct mem_cgroup *memcg)
+{
+ if (root_memcg == memcg)
+ return true;
+ if (!root_memcg->use_hierarchy)
+ return false;
+ return css_is_ancestor(&memcg->css, &root_memcg->css);
+}
+
static bool mem_cgroup_same_or_subtree(const struct mem_cgroup *root_memcg,
- struct mem_cgroup *memcg)
+ struct mem_cgroup *memcg)
{
- if (root_memcg != memcg) {
- return (root_memcg->use_hierarchy &&
- css_is_ancestor(&memcg->css, &root_memcg->css));
- }
+ bool ret;
- return true;
+ rcu_read_lock();
+ ret = __mem_cgroup_same_or_subtree(root_memcg, memcg);
+ rcu_read_unlock();
+ return ret;
}
int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg)
return (active > inactive);
}
-struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
- struct zone *zone)
-{
- int nid = zone_to_nid(zone);
- int zid = zone_idx(zone);
- struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
-
- return &mz->reclaim_stat;
-}
-
struct zone_reclaim_stat *
mem_cgroup_get_reclaim_stat_from_page(struct page *page)
{
/* Ensure pc->mem_cgroup is visible after reading PCG_USED. */
smp_rmb();
mz = page_cgroup_zoneinfo(pc->mem_cgroup, page);
- return &mz->reclaim_stat;
+ return &mz->lruvec.reclaim_stat;
}
#define mem_cgroup_from_res_counter(counter, member) \
* unused nodes. But scan_nodes is lazily updated and may not cotain
* enough new information. We need to do double check.
*/
-bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
+static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
{
int nid;
return 0;
}
-bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
+static bool mem_cgroup_reclaimable(struct mem_cgroup *memcg, bool noswap)
{
return test_mem_cgroup_node_reclaimable(memcg, 0, noswap);
}
/*
* try to call OOM killer. returns false if we should exit memory-reclaim loop.
*/
-bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order)
+static bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask,
+ int order)
{
struct oom_wait_info owait;
bool locked, need_to_kill;
*/
if (do_swap_account && PageSwapCache(page)) {
swp_entry_t ent = {.val = page_private(page)};
- struct mem_cgroup *swap_memcg;
- unsigned short id;
-
- id = swap_cgroup_record(ent, 0);
- rcu_read_lock();
- swap_memcg = mem_cgroup_lookup(id);
- if (swap_memcg) {
- /*
- * This recorded memcg can be obsolete one. So, avoid
- * calling css_tryget
- */
- if (!mem_cgroup_is_root(swap_memcg))
- res_counter_uncharge(&swap_memcg->memsw,
- PAGE_SIZE);
- mem_cgroup_swap_statistics(swap_memcg, false);
- mem_cgroup_put(swap_memcg);
- }
- rcu_read_unlock();
+ mem_cgroup_uncharge_swap(ent);
}
/*
* At swapin, we may charge account against cgroup which has no tasks.
* @entry: swap entry to be moved
* @from: mem_cgroup which the entry is moved from
* @to: mem_cgroup which the entry is moved to
- * @need_fixup: whether we should fixup res_counters and refcounts.
*
* It succeeds only when the swap_cgroup's record for this entry is the same
* as the mem_cgroup's id of @from.
* both res and memsw, and called css_get().
*/
static int mem_cgroup_move_swap_account(swp_entry_t entry,
- struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup)
+ struct mem_cgroup *from, struct mem_cgroup *to)
{
unsigned short old_id, new_id;
* swap-in, the refcount of @to might be decreased to 0.
*/
mem_cgroup_get(to);
- if (need_fixup) {
- if (!mem_cgroup_is_root(from))
- res_counter_uncharge(&from->memsw, PAGE_SIZE);
- mem_cgroup_put(from);
- /*
- * we charged both to->res and to->memsw, so we should
- * uncharge to->res.
- */
- if (!mem_cgroup_is_root(to))
- res_counter_uncharge(&to->res, PAGE_SIZE);
- }
return 0;
}
return -EINVAL;
}
#else
static inline int mem_cgroup_move_swap_account(swp_entry_t entry,
- struct mem_cgroup *from, struct mem_cgroup *to, bool need_fixup)
+ struct mem_cgroup *from, struct mem_cgroup *to)
{
return -EINVAL;
}
void mem_cgroup_replace_page_cache(struct page *oldpage,
struct page *newpage)
{
- struct mem_cgroup *memcg;
+ struct mem_cgroup *memcg = NULL;
struct page_cgroup *pc;
enum charge_type type = MEM_CGROUP_CHARGE_TYPE_CACHE;
pc = lookup_page_cgroup(oldpage);
/* fix accounting on old pages */
lock_page_cgroup(pc);
- memcg = pc->mem_cgroup;
- mem_cgroup_charge_statistics(memcg, false, -1);
- ClearPageCgroupUsed(pc);
+ if (PageCgroupUsed(pc)) {
+ memcg = pc->mem_cgroup;
+ mem_cgroup_charge_statistics(memcg, false, -1);
+ ClearPageCgroupUsed(pc);
+ }
unlock_page_cgroup(pc);
+ /*
+ * When called from shmem_replace_page(), in some cases the
+ * oldpage has already been charged, and in some cases not.
+ */
+ if (!memcg)
+ return;
+
if (PageSwapBacked(oldpage))
type = MEM_CGROUP_CHARGE_TYPE_SHMEM;
goto move_account;
}
-int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
+static int mem_cgroup_force_empty_write(struct cgroup *cont, unsigned int event)
{
return mem_cgroup_force_empty(mem_cgroup_from_cont(cont), true);
}
s64 stat[NR_MCS_STAT];
};
-struct {
+static struct {
char *local_name;
char *total_name;
} memcg_stat_strings[NR_MCS_STAT] = {
{
int nid, zid;
struct mem_cgroup_per_zone *mz;
+ struct zone_reclaim_stat *rstat;
unsigned long recent_rotated[2] = {0, 0};
unsigned long recent_scanned[2] = {0, 0};
for_each_online_node(nid)
for (zid = 0; zid < MAX_NR_ZONES; zid++) {
mz = mem_cgroup_zoneinfo(memcg, nid, zid);
+ rstat = &mz->lruvec.reclaim_stat;
- recent_rotated[0] +=
- mz->reclaim_stat.recent_rotated[0];
- recent_rotated[1] +=
- mz->reclaim_stat.recent_rotated[1];
- recent_scanned[0] +=
- mz->reclaim_stat.recent_scanned[0];
- recent_scanned[1] +=
- mz->reclaim_stat.recent_scanned[1];
+ recent_rotated[0] += rstat->recent_rotated[0];
+ recent_rotated[1] += rstat->recent_rotated[1];
+ recent_scanned[0] += rstat->recent_scanned[0];
+ recent_scanned[1] += rstat->recent_scanned[1];
}
cb->fill(cb, "recent_rotated_anon", recent_rotated[0]);
cb->fill(cb, "recent_rotated_file", recent_rotated[1]);
return NULL;
if (PageAnon(page)) {
/* we don't move shared anon */
- if (!move_anon() || page_mapcount(page) > 2)
+ if (!move_anon())
return NULL;
} else if (!move_file())
/* we ignore mapcount for file pages */
return page;
}
+#ifdef CONFIG_SWAP
static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, swp_entry_t *entry)
{
- int usage_count;
struct page *page = NULL;
swp_entry_t ent = pte_to_swp_entry(ptent);
if (!move_anon() || non_swap_entry(ent))
return NULL;
- usage_count = mem_cgroup_count_swap_user(ent, &page);
- if (usage_count > 1) { /* we don't move shared anon */
- if (page)
- put_page(page);
- return NULL;
- }
+ /*
+ * Because lookup_swap_cache() updates some statistics counter,
+ * we call find_get_page() with swapper_space directly.
+ */
+ page = find_get_page(&swapper_space, ent.val);
if (do_swap_account)
entry->val = ent.val;
return page;
}
+#else
+static struct page *mc_handle_swap_pte(struct vm_area_struct *vma,
+ unsigned long addr, pte_t ptent, swp_entry_t *entry)
+{
+ return NULL;
+}
+#endif
static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
unsigned long addr, pte_t ptent, swp_entry_t *entry)
{
struct page *page = NULL;
- struct inode *inode;
struct address_space *mapping;
pgoff_t pgoff;
if (!move_file())
return NULL;
- inode = vma->vm_file->f_path.dentry->d_inode;
mapping = vma->vm_file->f_mapping;
if (pte_none(ptent))
pgoff = linear_page_index(vma, addr);
break;
case MC_TARGET_SWAP:
ent = target.ent;
- if (!mem_cgroup_move_swap_account(ent,
- mc.from, mc.to, false)) {
+ if (!mem_cgroup_move_swap_account(ent, mc.from, mc.to)) {
mc.precharge--;
/* we fixup refcnts and charges later. */
mc.moved_swap++;
if (mm) {
if (mc.to)
mem_cgroup_move_charge(mm);
- put_swap_token(mm);
mmput(mm);
}
if (mc.to)
projects / deliverable / linux.git / blobdiff