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SubjectRe: [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@taobao.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@taobao.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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