[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]

[dm-devel] [PATCH 5/7] bio-cgroup: Remove a lot of ifdefs



This patch is for cleaning up the code of the cgroup memory subsystem
to remove a lot of "#ifdef"s.

Based on 2.6.27-rc1-mm1
Signed-off-by: Ryo Tsuruta <ryov valinux co jp>
Signed-off-by: Hirokazu Takahashi <taka valinux co jp>

diff -Ndupr linux-2.6.27-rc1-mm1.cg0/mm/memcontrol.c linux-2.6.27-rc1-mm1.cg1/mm/memcontrol.c
--- linux-2.6.27-rc1-mm1.cg0/mm/memcontrol.c	2008-08-01 19:48:55.000000000 +0900
+++ linux-2.6.27-rc1-mm1.cg1/mm/memcontrol.c	2008-08-01 19:49:38.000000000 +0900
@@ -228,6 +228,47 @@ struct mem_cgroup *mem_cgroup_from_task(
 				struct mem_cgroup, css);
 }
 
+static inline void get_mem_cgroup(struct mem_cgroup *mem)
+{
+	css_get(&mem->css);
+}
+
+static inline void put_mem_cgroup(struct mem_cgroup *mem)
+{
+	css_put(&mem->css);
+}
+
+static inline void set_mem_cgroup(struct page_cgroup *pc,
+					struct mem_cgroup *mem)
+{
+	pc->mem_cgroup = mem;
+}
+
+static inline void clear_mem_cgroup(struct page_cgroup *pc)
+{
+	struct mem_cgroup *mem = pc->mem_cgroup;
+	res_counter_uncharge(&mem->res, PAGE_SIZE);
+	pc->mem_cgroup = NULL;
+	put_mem_cgroup(mem);
+}
+
+static inline struct mem_cgroup *get_mem_page_cgroup(struct page_cgroup *pc)
+{
+	struct mem_cgroup *mem = pc->mem_cgroup;
+	css_get(&mem->css);
+	return mem;
+}
+
+/* This sould be called in an RCU-protected section. */
+static inline struct mem_cgroup *mm_get_mem_cgroup(struct mm_struct *mm)
+{
+	struct mem_cgroup *mem;
+
+	mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
+	get_mem_cgroup(mem);
+	return mem;
+}
+
 static void __mem_cgroup_remove_list(struct mem_cgroup_per_zone *mz,
 			struct page_cgroup *pc)
 {
@@ -297,6 +338,26 @@ static void __mem_cgroup_move_lists(stru
 	list_move(&pc->lru, &mz->lists[lru]);
 }
 
+static inline void mem_cgroup_add_page(struct page_cgroup *pc)
+{
+	struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mz->lru_lock, flags);
+	__mem_cgroup_add_list(mz, pc);
+	spin_unlock_irqrestore(&mz->lru_lock, flags);
+}
+
+static inline void mem_cgroup_remove_page(struct page_cgroup *pc)
+{
+	struct mem_cgroup_per_zone *mz = page_cgroup_zoneinfo(pc);
+	unsigned long flags;
+
+	spin_lock_irqsave(&mz->lru_lock, flags);
+	__mem_cgroup_remove_list(mz, pc);
+	spin_unlock_irqrestore(&mz->lru_lock, flags);
+}
+
 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
 {
 	int ret;
@@ -339,6 +400,36 @@ void mem_cgroup_move_lists(struct page *
 	unlock_page_cgroup(page);
 }
 
+static inline int mem_cgroup_try_to_allocate(struct mem_cgroup *mem,
+						gfp_t gfp_mask)
+{
+	unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
+
+	while (res_counter_charge(&mem->res, PAGE_SIZE)) {
+		if (!(gfp_mask & __GFP_WAIT))
+			return -1;
+
+		if (try_to_free_mem_cgroup_pages(mem, gfp_mask))
+			continue;
+
+		/*
+		 * try_to_free_mem_cgroup_pages() might not give us a full
+		 * picture of reclaim. Some pages are reclaimed and might be
+		 * moved to swap cache or just unmapped from the cgroup.
+		 * Check the limit again to see if the reclaim reduced the
+		 * current usage of the cgroup before giving up
+		 */
+		if (res_counter_check_under_limit(&mem->res))
+			continue;
+
+		if (!nr_retries--) {
+			mem_cgroup_out_of_memory(mem, gfp_mask);
+			return -1;
+		}
+	}
+	return 0;
+}
+
 /*
  * Calculate mapped_ratio under memory controller. This will be used in
  * vmscan.c for deteremining we have to reclaim mapped pages.
@@ -469,15 +560,14 @@ int mem_cgroup_shrink_usage(struct mm_st
 		return 0;
 
 	rcu_read_lock();
-	mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
-	css_get(&mem->css);
+	mem = mm_get_mem_cgroup(mm);
 	rcu_read_unlock();
 
 	do {
 		progress = try_to_free_mem_cgroup_pages(mem, gfp_mask);
 	} while (!progress && --retry);
 
-	css_put(&mem->css);
+	put_mem_cgroup(mem);
 	if (!retry)
 		return -ENOMEM;
 	return 0;
@@ -558,7 +648,7 @@ static int mem_cgroup_force_empty(struct
 	int ret = -EBUSY;
 	int node, zid;
 
-	css_get(&mem->css);
+	get_mem_cgroup(mem);
 	/*
 	 * page reclaim code (kswapd etc..) will move pages between
 	 * active_list <-> inactive_list while we don't take a lock.
@@ -578,7 +668,7 @@ static int mem_cgroup_force_empty(struct
 	}
 	ret = 0;
 out:
-	css_put(&mem->css);
+	put_mem_cgroup(mem);
 	return ret;
 }
 
@@ -873,10 +963,37 @@ struct cgroup_subsys mem_cgroup_subsys =
 
 #else /* CONFIG_CGROUP_MEM_RES_CTLR */
 
+struct mem_cgroup;
+
 static inline int mem_cgroup_disabled(void)
 {
 	return 1;
 }
+
+static inline void mem_cgroup_add_page(struct page_cgroup *pc) {}
+static inline void mem_cgroup_remove_page(struct page_cgroup *pc) {}
+static inline void get_mem_cgroup(struct mem_cgroup *mem) {}
+static inline void put_mem_cgroup(struct mem_cgroup *mem) {}
+static inline void set_mem_cgroup(struct page_cgroup *pc,
+					struct mem_cgroup *mem) {}
+static inline void clear_mem_cgroup(struct page_cgroup *pc) {}
+
+static inline struct mem_cgroup *get_mem_page_cgroup(struct page_cgroup *pc)
+{
+	return NULL;
+}
+
+static inline struct mem_cgroup *mm_get_mem_cgroup(struct mm_struct *mm)
+{
+	return NULL;
+}
+
+static inline int mem_cgroup_try_to_allocate(struct mem_cgroup *mem,
+					gfp_t gfp_mask)
+{
+	return 0;
+}
+
 #endif /* CONFIG_CGROUP_MEM_RES_CTLR */
 
 static inline int page_cgroup_locked(struct page *page)
@@ -906,12 +1023,7 @@ static int mem_cgroup_charge_common(stru
 				struct mem_cgroup *memcg)
 {
 	struct page_cgroup *pc;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
 	struct mem_cgroup *mem;
-	unsigned long flags;
-	unsigned long nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
-	struct mem_cgroup_per_zone *mz;
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
 
 	pc = kmem_cache_alloc(page_cgroup_cache, gfp_mask);
 	if (unlikely(pc == NULL))
@@ -925,47 +1037,16 @@ static int mem_cgroup_charge_common(stru
 	 */
 	if (likely(!memcg)) {
 		rcu_read_lock();
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-		mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
-		/*
-		 * For every charge from the cgroup, increment reference count
-		 */
-		css_get(&mem->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+		mem = mm_get_mem_cgroup(mm);
 		rcu_read_unlock();
 	} else {
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
 		mem = memcg;
-		css_get(&memcg->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
-	}
-
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-	while (res_counter_charge(&mem->res, PAGE_SIZE)) {
-		if (!(gfp_mask & __GFP_WAIT))
-			goto out;
-
-		if (try_to_free_mem_cgroup_pages(mem, gfp_mask))
-			continue;
-
-		/*
-		 * try_to_free_mem_cgroup_pages() might not give us a full
-		 * picture of reclaim. Some pages are reclaimed and might be
-		 * moved to swap cache or just unmapped from the cgroup.
-		 * Check the limit again to see if the reclaim reduced the
-		 * current usage of the cgroup before giving up
-		 */
-		if (res_counter_check_under_limit(&mem->res))
-			continue;
-
-		if (!nr_retries--) {
-			mem_cgroup_out_of_memory(mem, gfp_mask);
-			goto out;
-		}
+		get_mem_cgroup(mem);
 	}
-	pc->mem_cgroup = mem;
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
 
+	if (mem_cgroup_try_to_allocate(mem, gfp_mask) < 0)
+		goto out;
+	set_mem_cgroup(pc, mem);
 	pc->page = page;
 	/*
 	 * If a page is accounted as a page cache, insert to inactive list.
@@ -983,29 +1064,19 @@ static int mem_cgroup_charge_common(stru
 	lock_page_cgroup(page);
 	if (unlikely(page_get_page_cgroup(page))) {
 		unlock_page_cgroup(page);
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-		res_counter_uncharge(&mem->res, PAGE_SIZE);
-		css_put(&mem->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+		clear_mem_cgroup(pc);
 		kmem_cache_free(page_cgroup_cache, pc);
 		goto done;
 	}
 	page_assign_page_cgroup(page, pc);
 
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-	mz = page_cgroup_zoneinfo(pc);
-	spin_lock_irqsave(&mz->lru_lock, flags);
-	__mem_cgroup_add_list(mz, pc);
-	spin_unlock_irqrestore(&mz->lru_lock, flags);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+	mem_cgroup_add_page(pc);
 
 	unlock_page_cgroup(page);
 done:
 	return 0;
 out:
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-	css_put(&mem->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+	put_mem_cgroup(mem);
 	kmem_cache_free(page_cgroup_cache, pc);
 err:
 	return -ENOMEM;
@@ -1074,11 +1145,6 @@ static void
 __mem_cgroup_uncharge_common(struct page *page, enum charge_type ctype)
 {
 	struct page_cgroup *pc;
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-	struct mem_cgroup *mem;
-	struct mem_cgroup_per_zone *mz;
-	unsigned long flags;
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
 
 	if (mem_cgroup_disabled())
 		return;
@@ -1099,21 +1165,12 @@ __mem_cgroup_uncharge_common(struct page
 		|| PageSwapCache(page)))
 		goto unlock;
 
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-	mz = page_cgroup_zoneinfo(pc);
-	spin_lock_irqsave(&mz->lru_lock, flags);
-	__mem_cgroup_remove_list(mz, pc);
-	spin_unlock_irqrestore(&mz->lru_lock, flags);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+	mem_cgroup_remove_page(pc);
 
 	page_assign_page_cgroup(page, NULL);
 	unlock_page_cgroup(page);
 
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-	mem = pc->mem_cgroup;
-	res_counter_uncharge(&mem->res, PAGE_SIZE);
-	css_put(&mem->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+	clear_mem_cgroup(pc);
 
 	kmem_cache_free(page_cgroup_cache, pc);
 	return;
@@ -1148,10 +1205,7 @@ int mem_cgroup_prepare_migration(struct 
 	lock_page_cgroup(page);
 	pc = page_get_page_cgroup(page);
 	if (pc) {
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-		mem = pc->mem_cgroup;
-		css_get(&mem->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+		mem = get_mem_page_cgroup(pc);
 		if (pc->flags & PAGE_CGROUP_FLAG_CACHE)
 			ctype = MEM_CGROUP_CHARGE_TYPE_CACHE;
 	}
@@ -1159,9 +1213,7 @@ int mem_cgroup_prepare_migration(struct 
 	if (mem) {
 		ret = mem_cgroup_charge_common(newpage, NULL, GFP_KERNEL,
 			ctype, mem);
-#ifdef CONFIG_CGROUP_MEM_RES_CTLR
-		css_put(&mem->css);
-#endif /* CONFIG_CGROUP_MEM_RES_CTLR */
+		put_mem_cgroup(mem);
 	}
 	return ret;
 }


[Date Prev][Date Next]   [Thread Prev][Thread Next]   [Thread Index] [Date Index] [Author Index]