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SubjectRe: [PATCH 2/7] memcg: remove MEMCG_NR_FILE_MAPPED
On Thu 28-06-12 18:58:31, Sha Zhengju wrote:
> From: Sha Zhengju <handai.szj@taobao.com>
>
> While accounting memcg page stat, it's not worth to use MEMCG_NR_FILE_MAPPED
> as an extra layer of indirection because of the complexity and presumed
> performance overhead. We can use MEM_CGROUP_STAT_FILE_MAPPED directly.
>
> Signed-off-by: Sha Zhengju <handai.szj@taobao.com>

Acked-by: Michal Hocko <mhocko@suse.cz>

> ---
> include/linux/memcontrol.h | 25 +++++++++++++++++--------
> mm/memcontrol.c | 24 +-----------------------
> mm/rmap.c | 4 ++--
> 3 files changed, 20 insertions(+), 33 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index 83e7ba9..20b0f2d 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -27,9 +27,18 @@ struct page_cgroup;
> struct page;
> struct mm_struct;
>
> -/* Stats that can be updated by kernel. */
> -enum mem_cgroup_page_stat_item {
> - MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */
> +/*
> + * Statistics for memory cgroup.
> + */
> +enum mem_cgroup_stat_index {
> + /*
> + * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
> + */
> + MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
> + MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
> + MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
> + MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
> + MEM_CGROUP_STAT_NSTATS,
> };
>
> struct mem_cgroup_reclaim_cookie {
> @@ -164,17 +173,17 @@ static inline void mem_cgroup_end_update_page_stat(struct page *page,
> }
>
> void mem_cgroup_update_page_stat(struct page *page,
> - enum mem_cgroup_page_stat_item idx,
> + enum mem_cgroup_stat_index idx,
> int val);
>
> static inline void mem_cgroup_inc_page_stat(struct page *page,
> - enum mem_cgroup_page_stat_item idx)
> + enum mem_cgroup_stat_index idx)
> {
> mem_cgroup_update_page_stat(page, idx, 1);
> }
>
> static inline void mem_cgroup_dec_page_stat(struct page *page,
> - enum mem_cgroup_page_stat_item idx)
> + enum mem_cgroup_stat_index idx)
> {
> mem_cgroup_update_page_stat(page, idx, -1);
> }
> @@ -349,12 +358,12 @@ static inline void mem_cgroup_end_update_page_stat(struct page *page,
> }
>
> static inline void mem_cgroup_inc_page_stat(struct page *page,
> - enum mem_cgroup_page_stat_item idx)
> + enum mem_cgroup_stat_index idx)
> {
> }
>
> static inline void mem_cgroup_dec_page_stat(struct page *page,
> - enum mem_cgroup_page_stat_item idx)
> + enum mem_cgroup_stat_index idx)
> {
> }
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index a2677e0..ebed1ca 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -77,20 +77,6 @@ static int really_do_swap_account __initdata = 0;
> #endif
>
>
> -/*
> - * Statistics for memory cgroup.
> - */
> -enum mem_cgroup_stat_index {
> - /*
> - * For MEM_CONTAINER_TYPE_ALL, usage = pagecache + rss.
> - */
> - MEM_CGROUP_STAT_CACHE, /* # of pages charged as cache */
> - MEM_CGROUP_STAT_RSS, /* # of pages charged as anon rss */
> - MEM_CGROUP_STAT_FILE_MAPPED, /* # of pages charged as file rss */
> - MEM_CGROUP_STAT_SWAP, /* # of pages, swapped out */
> - MEM_CGROUP_STAT_NSTATS,
> -};
> -
> static const char * const mem_cgroup_stat_names[] = {
> "cache",
> "rss",
> @@ -1926,7 +1912,7 @@ void __mem_cgroup_end_update_page_stat(struct page *page, unsigned long *flags)
> }
>
> void mem_cgroup_update_page_stat(struct page *page,
> - enum mem_cgroup_page_stat_item idx, int val)
> + enum mem_cgroup_stat_index idx, int val)
> {
> struct mem_cgroup *memcg;
> struct page_cgroup *pc = lookup_page_cgroup(page);
> @@ -1939,14 +1925,6 @@ void mem_cgroup_update_page_stat(struct page *page,
> if (unlikely(!memcg || !PageCgroupUsed(pc)))
> return;
>
> - switch (idx) {
> - case MEMCG_NR_FILE_MAPPED:
> - idx = MEM_CGROUP_STAT_FILE_MAPPED;
> - break;
> - default:
> - BUG();
> - }
> -
> this_cpu_add(memcg->stat->count[idx], val);
> }
>
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 2144160..d6b93df 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1148,7 +1148,7 @@ void page_add_file_rmap(struct page *page)
> mem_cgroup_begin_update_page_stat(page, &locked, &flags);
> if (atomic_inc_and_test(&page->_mapcount)) {
> __inc_zone_page_state(page, NR_FILE_MAPPED);
> - mem_cgroup_inc_page_stat(page, MEMCG_NR_FILE_MAPPED);
> + mem_cgroup_inc_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
> }
> mem_cgroup_end_update_page_stat(page, &locked, &flags);
> }
> @@ -1202,7 +1202,7 @@ void page_remove_rmap(struct page *page)
> NR_ANON_TRANSPARENT_HUGEPAGES);
> } else {
> __dec_zone_page_state(page, NR_FILE_MAPPED);
> - mem_cgroup_dec_page_stat(page, MEMCG_NR_FILE_MAPPED);
> + mem_cgroup_dec_page_stat(page, MEM_CGROUP_STAT_FILE_MAPPED);
> }
> /*
> * It would be tidy to reset the PageAnon mapping here,
> --
> 1.7.1
>

--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic


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