(2012/11/07 17:41), 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
> @@ -118,6 +118,14 @@ static const char * const mem_cgroup_events_names[] = {
> "pgmajfault",
> };
>
> +static const char * const mem_cgroup_lru_names[] = {
> + "inactive_anon",
> + "active_anon",
> + "inactive_file",
> + "active_file",
> + "unevictable",
> +};
> +
Is this for the same strings with show_free_areas() ?
> /*
> * Per memcg event counter is incremented at every pagein/pageout. With THP,
> * it will be incremated by the number of pages. This counter is used for
> @@ -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) {
Why do you need to have this condition check ?
> + 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)));
Hm, how about using the same style with show_free_areas() ?
> + }
> +
> + 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));
> +
I don't think EVENTS info is useful for oom.
> + 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))));
How far does your new information has different format than usual oom ?
Could you show a sample and difference in changelog ?
Of course, I prefer both of them has similar format.
> + } 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));
> + }
> + }
> + printk(KERN_CONT "\n");
> +}
> /**
> - * mem_cgroup_print_oom_info: Called from OOM with tasklist_lock held in read mode.
> * @memcg: The memory cgroup that went over limit
> * @p: Task that is going to be killed
> *
> @@ -1569,6 +1628,8 @@ done:
> res_counter_read_u64(&memcg->kmem, RES_USAGE) >> 10,
> res_counter_read_u64(&memcg->kmem, RES_LIMIT) >> 10,
> res_counter_read_u64(&memcg->kmem, RES_FAILCNT));
> +
> + mem_cgroup_print_oom_stat(memcg);
> }
please put directly in print_oom_info()
Thanks,
-Kame
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