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Date: Mon, 27 Sep 2010 18:51:23 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: "linux-mm@...ck.org" <linux-mm@...ck.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: [RFC][PATCH 1/4] memcg: replace page_cgroup->mem_cgroup to be
unsigned short
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
replaces page_cgroup->mem_cgroup to be an unsigned short.
And add an ID for blkio cgroup.
More work will be required for reducing sturct page_cgroup size,
but maybe good as 1st step. As far as I tested, css_lookup() is enough fast.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
include/linux/page_cgroup.h | 3 +
mm/memcontrol.c | 86 +++++++++++++++++++++++++++-----------------
mm/page_cgroup.c | 2 -
3 files changed, 57 insertions(+), 34 deletions(-)
Index: mmotm-0922/include/linux/page_cgroup.h
===================================================================
--- mmotm-0922.orig/include/linux/page_cgroup.h
+++ mmotm-0922/include/linux/page_cgroup.h
@@ -12,7 +12,8 @@
*/
struct page_cgroup {
unsigned long flags;
- struct mem_cgroup *mem_cgroup;
+ unsigned short mem_cgroup;
+ unsigned short blkio_cgroup;
struct page *page;
struct list_head lru; /* per cgroup LRU list */
};
Index: mmotm-0922/mm/memcontrol.c
===================================================================
--- mmotm-0922.orig/mm/memcontrol.c
+++ mmotm-0922/mm/memcontrol.c
@@ -352,6 +352,40 @@ static void mem_cgroup_put(struct mem_cg
static struct mem_cgroup *parent_mem_cgroup(struct mem_cgroup *mem);
static void drain_all_stock_async(void);
+/*
+ * A helper function to get mem_cgroup from ID. must be called under
+ * rcu_read_lock(). The caller must check css_is_removed() or some if
+ * it's concern. (dropping refcnt from swap can be called against removed
+ * memcg.)
+ */
+static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
+{
+ struct cgroup_subsys_state *css;
+
+ /* ID 0 is unused ID */
+ if (!id)
+ return NULL;
+ if (id == 1)
+ return root_mem_cgroup;
+ css = css_lookup(&mem_cgroup_subsys, id);
+ if (!css)
+ return NULL;
+ return container_of(css, struct mem_cgroup, css);
+}
+
+/*
+ * If the ID is from pc->mem_cgroup, the mem_cgroup refered by ID must be
+ * exist as "valid" cgroup. It's guaranteed. You can use this easy function.
+ */
+static struct memcg_lookup(unsigned short id)
+{
+ struct mem_cgroup *mem;
+
+ rcu_read_lock();
+ mem = mem_cgroup_lookup(id);
+ rcu_read_unlock();
+ return mem;
+}
static struct mem_cgroup_per_zone *
mem_cgroup_zoneinfo(struct mem_cgroup *mem, int nid, int zid)
@@ -367,7 +401,7 @@ struct cgroup_subsys_state *mem_cgroup_c
static struct mem_cgroup_per_zone *
page_cgroup_zoneinfo(struct page_cgroup *pc)
{
- struct mem_cgroup *mem = pc->mem_cgroup;
+ struct mem_cgroup *mem = memcg_lookup(pc->mem_cgroup);
int nid = page_cgroup_nid(pc);
int zid = page_cgroup_zid(pc);
@@ -778,6 +812,11 @@ static inline bool mem_cgroup_is_root(st
return (mem == root_mem_cgroup);
}
+static inline bool mem_cgroup_id_is_root(unsigned short id)
+{
+ return (id == 1);
+}
+
/*
* Following LRU functions are allowed to be used without PCG_LOCK.
* Operations are called by routine of global LRU independently from memcg.
@@ -810,7 +849,7 @@ void mem_cgroup_del_lru_list(struct page
*/
mz = page_cgroup_zoneinfo(pc);
MEM_CGROUP_ZSTAT(mz, lru) -= 1;
- if (mem_cgroup_is_root(pc->mem_cgroup))
+ if (mem_cgroup_id_is_root(pc->mem_cgroup))
return;
VM_BUG_ON(list_empty(&pc->lru));
list_del_init(&pc->lru);
@@ -837,7 +876,7 @@ void mem_cgroup_rotate_lru_list(struct p
*/
smp_rmb();
/* unused or root page is not rotated. */
- if (!PageCgroupUsed(pc) || mem_cgroup_is_root(pc->mem_cgroup))
+ if (!PageCgroupUsed(pc) || mem_cgroup_id_is_root(pc->mem_cgroup))
return;
mz = page_cgroup_zoneinfo(pc);
list_move(&pc->lru, &mz->lists[lru]);
@@ -863,7 +902,7 @@ void mem_cgroup_add_lru_list(struct page
mz = page_cgroup_zoneinfo(pc);
MEM_CGROUP_ZSTAT(mz, lru) += 1;
SetPageCgroupAcctLRU(pc);
- if (mem_cgroup_is_root(pc->mem_cgroup))
+ if (mem_cgroup_id_is_root(pc->mem_cgroup))
return;
list_add(&pc->lru, &mz->lists[lru]);
}
@@ -1603,7 +1642,7 @@ static void mem_cgroup_update_file_stat(
return;
rcu_read_lock();
- mem = pc->mem_cgroup;
+ mem = memcg_lookup(pc->mem_cgroup);
if (unlikely(!mem || !PageCgroupUsed(pc)))
goto out;
/* pc->mem_cgroup is unstable ? */
@@ -1611,7 +1650,7 @@ static void mem_cgroup_update_file_stat(
/* take a lock against to access pc->mem_cgroup */
lock_page_cgroup(pc);
need_unlock = true;
- mem = pc->mem_cgroup;
+ mem = memcg_lookup(pc->mem_cgroup);
if (!mem || !PageCgroupUsed(pc))
goto out;
}
@@ -2030,24 +2069,6 @@ static void mem_cgroup_cancel_charge(str
__mem_cgroup_cancel_charge(mem, 1);
}
-/*
- * A helper function to get mem_cgroup from ID. must be called under
- * rcu_read_lock(). The caller must check css_is_removed() or some if
- * it's concern. (dropping refcnt from swap can be called against removed
- * memcg.)
- */
-static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
-{
- struct cgroup_subsys_state *css;
-
- /* ID 0 is unused ID */
- if (!id)
- return NULL;
- css = css_lookup(&mem_cgroup_subsys, id);
- if (!css)
- return NULL;
- return container_of(css, struct mem_cgroup, css);
-}
struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
{
@@ -2061,7 +2082,7 @@ struct mem_cgroup *try_get_mem_cgroup_fr
pc = lookup_page_cgroup(page);
lock_page_cgroup(pc);
if (PageCgroupUsed(pc)) {
- mem = pc->mem_cgroup;
+ mem = memcg_lookup(pc->mem_cgroup);
if (mem && !css_tryget(&mem->css))
mem = NULL;
} else if (PageSwapCache(page)) {
@@ -2097,7 +2118,7 @@ static void __mem_cgroup_commit_charge(s
return;
}
- pc->mem_cgroup = mem;
+ pc->mem_cgroup = css_id(&mem->css);
/*
* We access a page_cgroup asynchronously without lock_page_cgroup().
* Especially when a page_cgroup is taken from a page, pc->mem_cgroup
@@ -2155,7 +2176,7 @@ static void __mem_cgroup_move_account(st
VM_BUG_ON(PageLRU(pc->page));
VM_BUG_ON(!PageCgroupLocked(pc));
VM_BUG_ON(!PageCgroupUsed(pc));
- VM_BUG_ON(pc->mem_cgroup != from);
+ VM_BUG_ON(pc->mem_cgroup != css_id(&from->css));
if (PageCgroupFileMapped(pc)) {
/* Update mapped_file data for mem_cgroup */
@@ -2170,7 +2191,7 @@ static void __mem_cgroup_move_account(st
mem_cgroup_cancel_charge(from);
/* caller should have done css_get */
- pc->mem_cgroup = to;
+ pc->mem_cgroup = css_id(&to->css);
mem_cgroup_charge_statistics(to, pc, true);
/*
* We charges against "to" which may not have any tasks. Then, "to"
@@ -2190,7 +2211,7 @@ static int mem_cgroup_move_account(struc
{
int ret = -EINVAL;
lock_page_cgroup(pc);
- if (PageCgroupUsed(pc) && pc->mem_cgroup == from) {
+ if (PageCgroupUsed(pc) && pc->mem_cgroup == css_id(&from->css)) {
__mem_cgroup_move_account(pc, from, to, uncharge);
ret = 0;
}
@@ -2529,7 +2550,7 @@ __mem_cgroup_uncharge_common(struct page
lock_page_cgroup(pc);
- mem = pc->mem_cgroup;
+ mem = memcg_lookup(pc->mem_cgroup);
if (!PageCgroupUsed(pc))
goto unlock_out;
@@ -2774,7 +2795,7 @@ int mem_cgroup_prepare_migration(struct
pc = lookup_page_cgroup(page);
lock_page_cgroup(pc);
if (PageCgroupUsed(pc)) {
- mem = pc->mem_cgroup;
+ mem = memcg_lookup(pc->mem_cgroup);
css_get(&mem->css);
/*
* At migrating an anonymous page, its mapcount goes down
@@ -4585,7 +4606,8 @@ static int is_target_pte_for_mc(struct v
* mem_cgroup_move_account() checks the pc is valid or not under
* the lock.
*/
- if (PageCgroupUsed(pc) && pc->mem_cgroup == mc.from) {
+ if (PageCgroupUsed(pc) &&
+ pc->mem_cgroup == css_id(&mc.from->css)) {
ret = MC_TARGET_PAGE;
if (target)
target->page = page;
Index: mmotm-0922/mm/page_cgroup.c
===================================================================
--- mmotm-0922.orig/mm/page_cgroup.c
+++ mmotm-0922/mm/page_cgroup.c
@@ -15,7 +15,7 @@ static void __meminit
__init_page_cgroup(struct page_cgroup *pc, unsigned long pfn)
{
pc->flags = 0;
- pc->mem_cgroup = NULL;
+ pc->mem_cgroup = 0;
pc->page = pfn_to_page(pfn);
INIT_LIST_HEAD(&pc->lru);
}
--
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