[Devel] Re: [RFC][PATCH] memory controller per zone patches take 2 [4/10] calculate mapped ratio for memory cgroup

[Balbir Singh]

KAMEZAWA Hiroyuki wrote:
> Define function for calculating mapped_ratio in memory cgroup.
> 

Could you explain what the ratio is used for? Is it for reclaim
later?

> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>
> 



>  include/linux/memcontrol.h |   11 ++++++++++-
>  mm/memcontrol.c            |   13 +++++++++++++
>  2 files changed, 23 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6.24-rc2-mm1/mm/memcontrol.c
> ===================================================================
> --- linux-2.6.24-rc2-mm1.orig/mm/memcontrol.c
> +++ linux-2.6.24-rc2-mm1/mm/memcontrol.c
> @@ -423,6 +423,19 @@ void mem_cgroup_move_lists(struct page_c
>  	spin_unlock(&mem->lru_lock);
>  }
> 
> +/*
> + * Calculate mapped_ratio under memory controller.
> + */
> +int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
> +{
> +	s64 total, rss;
> +
> +	/* usage is recorded in bytes */
> +	total = mem->res.usage >> PAGE_SHIFT;
> +	rss = mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS);
> +	return (rss * 100) / total;

Never tried 64 bit division on a 32 bit system. I hope we don't
have to resort to do_div() sort of functionality.

> +}
> +
>  unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
>  					struct list_head *dst,
>  					unsigned long *scanned, int order,
> Index: linux-2.6.24-rc2-mm1/include/linux/memcontrol.h
> ===================================================================
> --- linux-2.6.24-rc2-mm1.orig/include/linux/memcontrol.h
> +++ linux-2.6.24-rc2-mm1/include/linux/memcontrol.h
> @@ -61,6 +61,12 @@ extern int mem_cgroup_prepare_migration(
>  extern void mem_cgroup_end_migration(struct page *page);
>  extern void mem_cgroup_page_migration(struct page *page, struct page *newpage);
> 
> +/*
> + * For memory reclaim.
> + */
> +extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem);
> +
> +
>  #else /* CONFIG_CGROUP_MEM_CONT */
>  static inline void mm_init_cgroup(struct mm_struct *mm,
>  					struct task_struct *p)
> @@ -132,7 +138,10 @@ mem_cgroup_page_migration(struct page *p
>  {
>  }
> 
> -
> +static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem)
> +{
> +	return 0;
> +}
>  #endif /* CONFIG_CGROUP_MEM_CONT */
> 
>  #endif /* _LINUX_MEMCONTROL_H */
> 


-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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