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Message-ID: <509BA96A.2070701@gmail.com>
Date: Thu, 08 Nov 2012 20:45:30 +0800
From: Sha Zhengju <handai.szj@...il.com>
To: Michal Hocko <mhocko@...e.cz>
CC: linux-mm@...ck.org, cgroups@...r.kernel.org,
kamezawa.hiroyu@...fujitsu.com, akpm@...ux-foundation.org,
rientjes@...gle.com, linux-kernel@...r.kernel.org,
Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH 1/2] memcg, oom: provide more precise dump info while
memcg oom happening
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@...bao.com>
>>
>> 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@...bao.com>
>> Cc: Michal Hocko<mhocko@...e.cz>
>> Cc: KAMEZAWA Hiroyuki<kamezawa.hiroyu@...fujitsu.com>
>> Cc: David Rientjes<rientjes@...gle.com>
>> Cc: Andrew Morton<akpm@...ux-foundation.org>
>> ---
>> 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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