Messages in this thread Patch in this message | | | Date | Tue, 27 Nov 2007 12:01:46 +0900 | From | KAMEZAWA Hiroyuki <> | Subject | [PATCH][for -mm] per-zone and reclaim enhancements for memory controller take 3 [4/10] calculate mapper_ratio per cgroup |
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Define function for calculating mapped_ratio in memory cgroup.
Changelog V1->V2 - Fixed possible divide-by-zero bug. - Use "long" to avoid 64bit division on 32 bit system. and does necessary type casts. - Added comments.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
include/linux/memcontrol.h | 11 ++++++++++- mm/memcontrol.c | 17 +++++++++++++++++ 2 files changed, 27 insertions(+), 1 deletion(-)
Index: linux-2.6.24-rc3-mm1/mm/memcontrol.c =================================================================== --- linux-2.6.24-rc3-mm1.orig/mm/memcontrol.c 2007-11-26 16:39:02.000000000 +0900 +++ linux-2.6.24-rc3-mm1/mm/memcontrol.c 2007-11-26 16:41:34.000000000 +0900 @@ -421,6 +421,23 @@ spin_unlock(&mem->lru_lock); } +/* + * Calculate mapped_ratio under memory controller. This will be used in + * vmscan.c for deteremining we have to reclaim mapped pages. + */ +int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) +{ + long total, rss; + + /* + * usage is recorded in bytes. But, here, we assume the number of + * physical pages can be represented by "long" on any arch. + */ + total = (long) (mem->res.usage >> PAGE_SHIFT) + 1L; + rss = (long)mem_cgroup_read_stat(&mem->stat, MEM_CGROUP_STAT_RSS); + return (int)((rss * 100L) / total); +} + 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-rc3-mm1/include/linux/memcontrol.h =================================================================== --- linux-2.6.24-rc3-mm1.orig/include/linux/memcontrol.h 2007-11-26 15:31:19.000000000 +0900 +++ linux-2.6.24-rc3-mm1/include/linux/memcontrol.h 2007-11-26 16:39:05.000000000 +0900 @@ -61,6 +61,12 @@ 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 @@ { } - +static inline int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem) +{ + return 0; +} #endif /* CONFIG_CGROUP_MEM_CONT */ #endif /* _LINUX_MEMCONTROL_H */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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