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Date: Fri, 5 Dec 2008 17:32:27 +0900
From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: "linux-mm@...ck.org" <linux-mm@...ck.org>,
"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"menage@...gle.com" <menage@...gle.com>
Subject: [RFC][PATCH 4/4] fix oom kill under hierarchy
From: KAMEZAWA Hiroyki <kamezawa.hiroyu@...fujitsu.com>
Current oom-kill by memcg cannot handle hierarchy in correct way.
This is a trial. please review.
After this.
- OOM Killer check hierarchy and can Kill badprocess under hierarchy.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
include/linux/cgroup.h | 1
include/linux/memcontrol.h | 7 +++--
kernel/cgroup.c | 14 ++++++++++
mm/memcontrol.c | 59 ++++++++++++++++++++++++++++++++++++++++++---
mm/oom_kill.c | 4 +--
5 files changed, 77 insertions(+), 8 deletions(-)
Index: mmotm-2.6.28-Dec03/mm/memcontrol.c
===================================================================
--- mmotm-2.6.28-Dec03.orig/mm/memcontrol.c
+++ mmotm-2.6.28-Dec03/mm/memcontrol.c
@@ -380,12 +380,38 @@ void mem_cgroup_move_lists(struct page *
mem_cgroup_add_lru_list(page, to);
}
-int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem)
+static int mm_under_cgroup(struct mm_struct *mm, struct mem_cgroup *mcg)
+{
+ struct cgroup *cg, *check;
+ int ret = 0;
+
+ if (!mm)
+ return 0;
+
+ rcu_read_lock();
+
+ VM_BUG_ON(css_under_removal(&mcg->css));
+
+ cg = task_cgroup(rcu_dereference(mm->owner), mem_cgroup_subsys_id);
+ check = mcg->css.cgroup;
+
+ if (!mcg->use_hierarchy)
+ ret = (cg == check);
+ else
+ ret = cgroup_check_ancestor(cg, check);
+ rcu_read_unlock();
+
+ return ret;
+}
+
+
+int task_in_mem_cgroup_hierarchy(struct task_struct *task,
+ struct mem_cgroup *mem)
{
int ret;
task_lock(task);
- ret = task->mm && mm_match_cgroup(task->mm, mem);
+ ret = mm_under_cgroup(task->mm, mem);
task_unlock(task);
return ret;
}
@@ -636,6 +662,33 @@ static int mem_cgroup_hierarchical_recla
return ret;
}
+void update_oom_jiffies(struct mem_cgroup *mem)
+{
+ struct cgroup *cgroup, *rootcg;
+ struct mem_cgroup *tmp;
+ int rootid, nextid, depth, found;
+
+ if (!mem->use_hierarchy) {
+ mem->last_oom_jiffies = jiffies;
+ return;
+ }
+ rootcg = mem->css.cgroup;
+ rootid = cgroup_id(rootcg);
+ depth = cgroup_depth(rootcg);
+ nextid = 0;
+ rcu_read_lock();
+ while (1) {
+ cgroup = cgroup_get_next(nextid, rootid, depth, &found);
+
+ if (!cgroup)
+ break;
+ tmp = mem_cgroup_from_cont(cgroup);
+ tmp->last_oom_jiffies = jiffies;
+ nextid = found + 1;
+ }
+ rcu_read_unlock();
+}
+
bool mem_cgroup_oom_called(struct task_struct *task)
{
bool ret = false;
@@ -735,7 +788,7 @@ static int __mem_cgroup_try_charge(struc
if (oom) {
mem_cgroup_out_of_memory(mem_over_limit,
gfp_mask);
- mem_over_limit->last_oom_jiffies = jiffies;
+ update_oom_jiffies(mem_over_limit);
}
goto nomem;
}
Index: mmotm-2.6.28-Dec03/mm/oom_kill.c
===================================================================
--- mmotm-2.6.28-Dec03.orig/mm/oom_kill.c
+++ mmotm-2.6.28-Dec03/mm/oom_kill.c
@@ -220,7 +220,7 @@ static struct task_struct *select_bad_pr
/* skip the init task */
if (is_global_init(p))
continue;
- if (mem && !task_in_mem_cgroup(p, mem))
+ if (mem && !task_in_mem_cgroup_hierarchy(p, mem))
continue;
/*
@@ -292,7 +292,7 @@ static void dump_tasks(const struct mem_
*/
if (!p->mm)
continue;
- if (mem && !task_in_mem_cgroup(p, mem))
+ if (mem && !task_in_mem_cgroup_hierarchy(p, mem))
continue;
if (!thread_group_leader(p))
continue;
Index: mmotm-2.6.28-Dec03/include/linux/cgroup.h
===================================================================
--- mmotm-2.6.28-Dec03.orig/include/linux/cgroup.h
+++ mmotm-2.6.28-Dec03/include/linux/cgroup.h
@@ -440,6 +440,7 @@ cgroup_get_next(int id, int rootid, int
/* get id and depth of cgroup */
int cgroup_id(struct cgroup *cgroup);
int cgroup_depth(struct cgroup *cgroup);
+int cgroup_check_ancestor(struct cgroup *cur, struct cgroup *ans);
/* For delayed freeing of IDs */
int cgroup_id_tryget(int id);
void cgroup_id_put(int id);
Index: mmotm-2.6.28-Dec03/kernel/cgroup.c
===================================================================
--- mmotm-2.6.28-Dec03.orig/kernel/cgroup.c
+++ mmotm-2.6.28-Dec03/kernel/cgroup.c
@@ -805,6 +805,20 @@ cgroup_get_next(int id, int rootid, int
*foundid = tmpid;
return ret;
}
+/*
+ * called under RCU. (or some routine which prevent freeing cgroup)
+ */
+int cgroup_check_ancestor(struct cgroup *cur, struct cgroup *ans)
+{
+ struct cgroup_id *cid = rcu_dereference(cur->id);
+ struct cgroup_id *ansid = rcu_dereference(ans->id);
+
+ if (!cid || !ansid)
+ return 0;
+ if (cid->hierarchy_code[ansid->depth] == ansid->id)
+ return 1;
+ return 0;
+}
/*
* A couple of forward declarations required, due to cyclic reference loop:
Index: mmotm-2.6.28-Dec03/include/linux/memcontrol.h
===================================================================
--- mmotm-2.6.28-Dec03.orig/include/linux/memcontrol.h
+++ mmotm-2.6.28-Dec03/include/linux/memcontrol.h
@@ -67,7 +67,8 @@ extern unsigned long mem_cgroup_isolate_
struct mem_cgroup *mem_cont,
int active, int file);
extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
-int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
+int task_in_mem_cgroup_hierarchy(struct task_struct *task,
+ struct mem_cgroup *mem);
extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);
@@ -198,8 +199,8 @@ static inline int mm_match_cgroup(struct
return 1;
}
-static inline int task_in_mem_cgroup(struct task_struct *task,
- const struct mem_cgroup *mem)
+static inline int task_in_mem_cgroup_hierarchy(struct task_struct *task,
+ struct mem_cgroup *mem)
{
return 1;
}
--
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