memcg: remove the overhead associated with the root cgroup

Change the memory cgroup to remove the overhead associated with accounting
all pages in the root cgroup.  As a side-effect, we can no longer set a
memory hard limit in the root cgroup.

A new flag to track whether the page has been accounted or not has been
added as well.  Flags are now set atomically for page_cgroup,
pcg_default_flags is now obsolete and removed.

[akpm@linux-foundation.org: fix a few documentation glitches]
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 40 insertions, 14 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index cf2e717f5c12..b0757660663f 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -43,6 +43,7 @@
 
 struct cgroup_subsys mem_cgroup_subsys __read_mostly;
 #define MEM_CGROUP_RECLAIM_RETRIES      5
+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 */
@@ -200,13 +201,8 @@ enum charge_type {
 #define PCGF_CACHE      (1UL << PCG_CACHE)
 #define PCGF_USED       (1UL << PCG_USED)
 #define PCGF_LOCK       (1UL << PCG_LOCK)
-static const unsigned long
-pcg_default_flags[NR_CHARGE_TYPE] = {
-        PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* File Cache */
-        PCGF_USED | PCGF_LOCK, /* Anon */
-        PCGF_CACHE | PCGF_USED | PCGF_LOCK, /* Shmem */
-        0, /* FORCE */
-};
+/* Not used, but added here for completeness */
+#define PCGF_ACCT       (1UL << PCG_ACCT)
 
 /* for encoding cft->private value on file */
 #define _MEM                    (0)
@@ -354,6 +350,11 @@ static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data,
         return ret;
 }
 
+static inline bool mem_cgroup_is_root(struct mem_cgroup *mem)
+{
+        return (mem == root_mem_cgroup);
+}
+
 /*
  * Following LRU functions are allowed to be used without PCG_LOCK.
  * Operations are called by routine of global LRU independently from memcg.
@@ -371,22 +372,24 @@ static int mem_cgroup_walk_tree(struct mem_cgroup *root, void *data,
 void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru)
 {
         struct page_cgroup *pc;
-        struct mem_cgroup *mem;
         struct mem_cgroup_per_zone *mz;
 
         if (mem_cgroup_disabled())
                 return;
         pc = lookup_page_cgroup(page);
         /* can happen while we handle swapcache. */
-        if (list_empty(&pc->lru) || !pc->mem_cgroup)
+        if (!TestClearPageCgroupAcctLRU(pc))
                 return;
+        VM_BUG_ON(!pc->mem_cgroup);
         /*
          * We don't check PCG_USED bit. It's cleared when the "page" is finally
          * removed from global LRU.
          */
         mz = page_cgroup_zoneinfo(pc);
-        mem = pc->mem_cgroup;
         MEM_CGROUP_ZSTAT(mz, lru) -= 1;
+        if (mem_cgroup_is_root(pc->mem_cgroup))
+                return;
+        VM_BUG_ON(list_empty(&pc->lru));
         list_del_init(&pc->lru);
         return;
 }
@@ -410,8 +413,8 @@ void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru)
          * For making pc->mem_cgroup visible, insert smp_rmb() here.
          */
         smp_rmb();
-        /* unused page is not rotated. */
-        if (!PageCgroupUsed(pc))
+        /* unused or root page is not rotated. */
+        if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup))
                 return;
         mz = page_cgroup_zoneinfo(pc);
         list_move(&pc->lru, &mz->lists[lru]);
@@ -425,6 +428,7 @@ void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru)
         if (mem_cgroup_disabled())
                 return;
         pc = lookup_page_cgroup(page);
+        VM_BUG_ON(PageCgroupAcctLRU(pc));
         /*
          * Used bit is set without atomic ops but after smp_wmb().
          * For making pc->mem_cgroup visible, insert smp_rmb() here.
@@ -435,6 +439,9 @@ void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru)
 
         mz = page_cgroup_zoneinfo(pc);
         MEM_CGROUP_ZSTAT(mz, lru) += 1;
+        SetPageCgroupAcctLRU(pc);
+        if (mem_cgroup_is_root(pc->mem_cgroup))
+                return;
         list_add(&pc->lru, &mz->lists[lru]);
 }
 
@@ -469,7 +476,7 @@ static void mem_cgroup_lru_add_after_commit_swapcache(struct page *page)
 
         spin_lock_irqsave(&zone->lru_lock, flags);
         /* link when the page is linked to LRU but page_cgroup isn't */
-        if (PageLRU(page) && list_empty(&pc->lru))
+        if (PageLRU(page) && !PageCgroupAcctLRU(pc))
                 mem_cgroup_add_lru_list(page, page_lru(page));
         spin_unlock_irqrestore(&zone->lru_lock, flags);
 }
@@ -1125,9 +1132,22 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem,
                 css_put(&mem->css);
                 return;
         }
+
         pc->mem_cgroup = mem;
         smp_wmb();
-        pc->flags = pcg_default_flags[ctype];
+        switch (ctype) {
+        case MEM_CGROUP_CHARGE_TYPE_CACHE:
+        case MEM_CGROUP_CHARGE_TYPE_SHMEM:
+                SetPageCgroupCache(pc);
+                SetPageCgroupUsed(pc);
+                break;
+        case MEM_CGROUP_CHARGE_TYPE_MAPPED:
+                ClearPageCgroupCache(pc);
+                SetPageCgroupUsed(pc);
+                break;
+        default:
+                break;
+        }
 
         mem_cgroup_charge_statistics(mem, pc, true);
 
@@ -2083,6 +2103,10 @@ static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
         name = MEMFILE_ATTR(cft->private);
         switch (name) {
         case RES_LIMIT:
+                if (mem_cgroup_is_root(memcg)) { /* Can't set limit on root */
+                        ret = -EINVAL;
+                        break;
+                }
                 /* This function does all necessary parse...reuse it */
                 ret = res_counter_memparse_write_strategy(buffer, &val);
                 if (ret)
@@ -2549,6 +2573,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
         if (cont->parent == NULL) {
                 enable_swap_cgroup();
                 parent = NULL;
+                root_mem_cgroup = mem;
         } else {
                 parent = mem_cgroup_from_cont(cont->parent);
                 mem->use_hierarchy = parent->use_hierarchy;
@@ -2577,6 +2602,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
         return &mem->css;
 free_out:
         __mem_cgroup_free(mem);
+        root_mem_cgroup = NULL;
         return ERR_PTR(error);
 }