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authorKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>2009-01-07 18:08:08 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:06 -0800
commita636b327f731143ccc544b966cfd8de6cb6d72c6 (patch)
treee53b03b64e8ebca20649c2d877bc4c3ef54ec34c /mm
parent2e4d40915fb85207fe48cfc31201824ec6d7426e (diff)
downloadop-kernel-dev-a636b327f731143ccc544b966cfd8de6cb6d72c6.zip
op-kernel-dev-a636b327f731143ccc544b966cfd8de6cb6d72c6.tar.gz
memcg: avoid unnecessary system-wide-oom-killer
Current mmtom has new oom function as pagefault_out_of_memory(). It's added for select bad process rathar than killing current. When memcg hit limit and calls OOM at page_fault, this handler called and system-wide-oom handling happens. (means kernel panics if panic_on_oom is true....) To avoid overkill, check memcg's recent behavior before starting system-wide-oom. And this patch also fixes to guarantee "don't accnout against process with TIF_MEMDIE". This is necessary for smooth OOM. [akpm@linux-foundation.org: build fix] Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Cc: Badari Pulavarty <pbadari@us.ibm.com> Cc: Jan Blunck <jblunck@suse.de> Cc: Hirokazu Takahashi <taka@valinux.co.jp> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c33
-rw-r--r--mm/oom_kill.c8
2 files changed, 37 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 886e222..659b0c5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -153,7 +153,7 @@ struct mem_cgroup {
* Should the accounting and control be hierarchical, per subtree?
*/
bool use_hierarchy;
-
+ unsigned long last_oom_jiffies;
int obsolete;
atomic_t refcnt;
/*
@@ -615,6 +615,22 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
return ret;
}
+bool mem_cgroup_oom_called(struct task_struct *task)
+{
+ bool ret = false;
+ struct mem_cgroup *mem;
+ struct mm_struct *mm;
+
+ rcu_read_lock();
+ mm = task->mm;
+ if (!mm)
+ mm = &init_mm;
+ mem = mem_cgroup_from_task(rcu_dereference(mm->owner));
+ if (mem && time_before(jiffies, mem->last_oom_jiffies + HZ/10))
+ ret = true;
+ rcu_read_unlock();
+ return ret;
+}
/*
* Unlike exported interface, "oom" parameter is added. if oom==true,
* oom-killer can be invoked.
@@ -626,6 +642,13 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
struct mem_cgroup *mem, *mem_over_limit;
int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
struct res_counter *fail_res;
+
+ if (unlikely(test_thread_flag(TIF_MEMDIE))) {
+ /* Don't account this! */
+ *memcg = NULL;
+ return 0;
+ }
+
/*
* We always charge the cgroup the mm_struct belongs to.
* The mm_struct's mem_cgroup changes on task migration if the
@@ -694,8 +717,10 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
continue;
if (!nr_retries--) {
- if (oom)
+ if (oom) {
mem_cgroup_out_of_memory(mem, gfp_mask);
+ mem->last_oom_jiffies = jiffies;
+ }
goto nomem;
}
}
@@ -832,7 +857,7 @@ static int mem_cgroup_move_parent(struct page_cgroup *pc,
ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false);
- if (ret)
+ if (ret || !parent)
return ret;
if (!get_page_unless_zero(page))
@@ -883,7 +908,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm,
mem = memcg;
ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true);
- if (ret)
+ if (ret || !mem)
return ret;
__mem_cgroup_commit_charge(mem, pc, ctype);
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 6b9e758..fd150e3 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -560,6 +560,13 @@ void pagefault_out_of_memory(void)
/* Got some memory back in the last second. */
return;
+ /*
+ * If this is from memcg, oom-killer is already invoked.
+ * and not worth to go system-wide-oom.
+ */
+ if (mem_cgroup_oom_called(current))
+ goto rest_and_return;
+
if (sysctl_panic_on_oom)
panic("out of memory from page fault. panic_on_oom is selected.\n");
@@ -571,6 +578,7 @@ void pagefault_out_of_memory(void)
* Give "p" a good chance of killing itself before we
* retry to allocate memory.
*/
+rest_and_return:
if (!test_thread_flag(TIF_MEMDIE))
schedule_timeout_uninterruptible(1);
}
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