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Date: Sat, 16 Jun 2012 15:31:16 +0900
From: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To: Sha Zhengju <handai.szj@...il.com>
CC: linux-mm@...ck.org, cgroups@...r.kernel.org, gthelen@...gle.com,
yinghan@...gle.com, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org, Sha Zhengju <handai.szj@...bao.com>
Subject: Re: [PATCH 1/2] memcg: remove MEMCG_NR_FILE_MAPPED
(2012/06/15 21:00), Sha Zhengju wrote:
> While doing memcg page stat accounting, there's no need to use MEMCG_NR_FILE_MAPPED
> as an intermediate, we can use MEM_CGROUP_STAT_FILE_MAPPED directly.
>
> Signed-off-by: Sha Zhengju<handai.szj@...bao.com>
I'm sorry but my recent patch modified mem_cgroup_stat_index and this will hunk with
mm tree. (not visible in linux-next yet.)
I have no objection to the patch. I'm grad if you'll update this and repost, later.
Thanks,
-Kame
> ---
> include/linux/memcontrol.h | 22 ++++++++++++++++------
> mm/memcontrol.c | 25 +------------------------
> mm/rmap.c | 4 ++--
> 3 files changed, 19 insertions(+), 32 deletions(-)
>
> diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
> index f94efd2..a337c2e 100644
> --- a/include/linux/memcontrol.h
> +++ b/include/linux/memcontrol.h
> @@ -27,9 +27,19 @@ 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_SWAPOUT, /* # of pages, swapped out */
> + MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
> + MEM_CGROUP_STAT_NSTATS,
> };
>
> struct mem_cgroup_reclaim_cookie {
> @@ -170,17 +180,17 @@ 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);
> }
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 7685d4a..9102b8c 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -77,21 +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_SWAPOUT, /* # of pages, swapped out */
> - MEM_CGROUP_STAT_DATA, /* end of data requires synchronization */
> - MEM_CGROUP_STAT_NSTATS,
> -};
> -
> enum mem_cgroup_events_index {
> MEM_CGROUP_EVENTS_PGPGIN, /* # of pages paged in */
> MEM_CGROUP_EVENTS_PGPGOUT, /* # of pages paged out */
> @@ -1958,7 +1943,7 @@ 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);
> @@ -1971,14 +1956,6 @@ 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 5b5ad58..7e4e481 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1154,7 +1154,7 @@ 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);
> }
> @@ -1208,7 +1208,7 @@ 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,
--
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