On 11/08/2012 06:17 AM, Michal Hocko wrote:
On Wed 07-11-12 16:41:36, Sha Zhengju wrote:
From: Sha Zhengju<handai.szj@xxxxxxxxxx>
Current, when a memcg oom is happening the oom dump messages is still global
state and provides few useful info for users. This patch prints more pointed
memcg page statistics for memcg-oom.
Signed-off-by: Sha Zhengju<handai.szj@xxxxxxxxxx>
Cc: Michal Hocko<mhocko@xxxxxxx>
Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: David Rientjes<rientjes@xxxxxxxxxx>
Cc: Andrew Morton<akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++-------
mm/oom_kill.c | 6 +++-
2 files changed, 66 insertions(+), 11 deletions(-)
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 0eab7d5..2df5e72 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
[...]
@@ -1501,8 +1509,59 @@ static void move_unlock_mem_cgroup(struct mem_cgroup *memcg,
spin_unlock_irqrestore(&memcg->move_lock, *flags);
}
+#define K(x) ((x)<< (PAGE_SHIFT-10))
+static void mem_cgroup_print_oom_stat(struct mem_cgroup *memcg)
+{
+ struct mem_cgroup *mi;
+ unsigned int i;
+
+ if (!memcg->use_hierarchy&& memcg != root_mem_cgroup) {
+ for (i = 0; i< MEM_CGROUP_STAT_NSTATS; i++) {
+ if (i == MEM_CGROUP_STAT_SWAP&& !do_swap_account)
+ continue;
+ printk(KERN_CONT "%s:%ldKB ", mem_cgroup_stat_names[i],
+ K(mem_cgroup_read_stat(memcg, i)));
+ }
+
+ for (i = 0; i< MEM_CGROUP_EVENTS_NSTATS; i++)
+ printk(KERN_CONT "%s:%lu ", mem_cgroup_events_names[i],
+ mem_cgroup_read_events(memcg, i));
+
+ for (i = 0; i< NR_LRU_LISTS; i++)
+ printk(KERN_CONT "%s:%luKB ", mem_cgroup_lru_names[i],
+ K(mem_cgroup_nr_lru_pages(memcg, BIT(i))));
+ } else {
+
+ for (i = 0; i< MEM_CGROUP_STAT_NSTATS; i++) {
+ long long val = 0;
+
+ if (i == MEM_CGROUP_STAT_SWAP&& !do_swap_account)
+ continue;
+ for_each_mem_cgroup_tree(mi, memcg)
+ val += mem_cgroup_read_stat(mi, i);
+ printk(KERN_CONT "%s:%lldKB ", mem_cgroup_stat_names[i], K(val));
+ }
+
+ for (i = 0; i< MEM_CGROUP_EVENTS_NSTATS; i++) {
+ unsigned long long val = 0;
+
+ for_each_mem_cgroup_tree(mi, memcg)
+ val += mem_cgroup_read_events(mi, i);
+ printk(KERN_CONT "%s:%llu ",
+ mem_cgroup_events_names[i], val);
+ }
+
+ for (i = 0; i< NR_LRU_LISTS; i++) {
+ unsigned long long val = 0;
+
+ for_each_mem_cgroup_tree(mi, memcg)
+ val += mem_cgroup_nr_lru_pages(mi, BIT(i));
+ printk(KERN_CONT "%s:%lluKB ", mem_cgroup_lru_names[i], K(val));
+ }
+ }
This is just plain ugly. for_each_mem_cgroup_tree is use_hierarchy aware
and there is no need for if (use_hierarchy) part.
memcg != root_mem_cgroup test doesn't make much sense as well because we
call that a global oom killer ;)
Yes... bitterly did I repent the patch... The else-part of
for_each_mem_cgroup_tree
is enough for hierarchy. I'll send a update one later.
Sorry for the noise. : (
Thanks,
Sha
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