linux-kernel - Re: [PATCH 7/7] memcg: print more detailed info while memcg oom happening

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Date:	Wed, 04 Jul 2012 16:25:44 +0800
From:	Sha Zhengju <handai.szj@...il.com>
To:	linux-mm@...ck.org, cgroups@...r.kernel.org
CC:	kamezawa.hiroyu@...fujitsu.com, gthelen@...gle.com,
	yinghan@...gle.com, akpm@...ux-foundation.org, mhocko@...e.cz,
	linux-kernel@...r.kernel.org, Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH 7/7] memcg: print more detailed info while memcg oom happening

Hi, Kame

How about this bit？ :-)

On 06/28/2012 07:06 PM, Sha Zhengju wrote:
> From: Sha Zhengju<handai.szj@...bao.com>
>
> While memcg oom happening, the dump info is limited, so add this
> to provide memcg page stat.
>
> Signed-off-by: Sha Zhengju<handai.szj@...bao.com>
> ---
>   mm/memcontrol.c |   42 ++++++++++++++++++++++++++++++++++--------
>   1 files changed, 34 insertions(+), 8 deletions(-)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 8493119..3ed41e9 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -101,6 +101,14 @@ 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",
> +};
> +
>   /*
>    * 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
> @@ -1358,6 +1366,30 @@ 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)
> +{
> +	int i;
> +
> +	printk(KERN_INFO "Memory cgroup stat:\n");
> +	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))));
> +	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
> @@ -1422,6 +1454,8 @@ done:
>   		res_counter_read_u64(&memcg->memsw, RES_USAGE)>>  10,
>   		res_counter_read_u64(&memcg->memsw, RES_LIMIT)>>  10,
>   		res_counter_read_u64(&memcg->memsw, RES_FAILCNT));
> +
> +	mem_cgroup_print_oom_stat(memcg);
>   }
>
>   /*
> @@ -4043,14 +4077,6 @@ static int mem_control_numa_stat_show(struct cgroup *cont, struct cftype *cft,
>   }
>   #endif /* CONFIG_NUMA */
>
> -static const char * const mem_cgroup_lru_names[] = {
> -	"inactive_anon",
> -	"active_anon",
> -	"inactive_file",
> -	"active_file",
> -	"unevictable",
> -};
> -
>   static inline void mem_cgroup_lru_names_not_uptodate(void)
>   {
>   	BUILD_BUG_ON(ARRAY_SIZE(mem_cgroup_lru_names) != NR_LRU_LISTS);

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