linux-kernel - Re: [RFC][PATCH v3 3/10] memcg: a test whether zone is reclaimable or not

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Date:	Fri, 27 May 2011 00:21:31 -0700
From:	Ying Han <yinghan@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>
Subject: Re: [RFC][PATCH v3 3/10] memcg: a test whether zone is reclaimable or not

On Wed, May 25, 2011 at 10:19 PM, KAMEZAWA Hiroyuki
<kamezawa.hiroyu@...fujitsu.com> wrote:
> From: Ying Han <yinghan@...gle.com>
>
> The number of reclaimable pages per zone is an useful information for
> controling memory reclaim schedule. This patch exports it.
>
> Changelog v2->v3:
>  - added comments.
>
> Signed-off-by: Ying Han <yinghan@...gle.com>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> ---
>  include/linux/memcontrol.h |    2 ++
>  mm/memcontrol.c            |   24 ++++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
>
> Index: memcg_async/mm/memcontrol.c
> ===================================================================
> --- memcg_async.orig/mm/memcontrol.c
> +++ memcg_async/mm/memcontrol.c
> @@ -1240,6 +1240,30 @@ static unsigned long mem_cgroup_nr_lru_p
>  }
>  #endif /* CONFIG_NUMA */
>
> +/**
> + * mem_cgroup_zone_reclaimable_pages
> + * @memcg: the memcg
> + * @nid  : node index to be checked.
> + * @zid  : zone index to be checked.
> + *
> + * This function returns the number reclaimable pages on a zone for given memcg.
> + * Reclaimable page includes file caches and anonymous pages if swap is
> + * avaliable and never includes unevictable pages.
> + */
> +unsigned long mem_cgroup_zone_reclaimable_pages(struct mem_cgroup *memcg,
> +                                               int nid, int zid)
> +{
> +       unsigned long nr;
> +       struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);
> +
> +       nr = MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_FILE) +
> +               MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_FILE);
> +       if (nr_swap_pages > 0)
> +               nr += MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_ANON) +
> +                       MEM_CGROUP_ZSTAT(mz, NR_INACTIVE_ANON);
> +       return nr;
> +}
> +
>  struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
>                                                      struct zone *zone)
>  {
> Index: memcg_async/include/linux/memcontrol.h
> ===================================================================
> --- memcg_async.orig/include/linux/memcontrol.h
> +++ memcg_async/include/linux/memcontrol.h
> @@ -109,6 +109,8 @@ extern void mem_cgroup_end_migration(str
>  */
>  int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);
>  int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);
> +unsigned long
> +mem_cgroup_zone_reclaimable_pages(struct mem_cgroup *memcg, int nid, int zid);
>  int mem_cgroup_select_victim_node(struct mem_cgroup *memcg);
>  unsigned long mem_cgroup_zone_nr_lru_pages(struct mem_cgroup *memcg,
>                                                struct zone *zone,
>
>

Again, please apply the patch:

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6a52699..0b88d71 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -1217,7 +1217,7 @@ unsigned long
mem_cgroup_zone_reclaimable_pages(struct mem_cgroup *memcg,
       struct mem_cgroup_per_zone *mz = mem_cgroup_zoneinfo(memcg, nid, zid);

       nr = MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_FILE) +
-               MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_FILE);
+               MEM_CGROUP_ZSTAT(mz, NR_INACTIVE_FILE);
       if (nr_swap_pages > 0)
               nr += MEM_CGROUP_ZSTAT(mz, NR_ACTIVE_ANON) +
                       MEM_CGROUP_ZSTAT(mz, NR_INACTIVE_ANON);


Also, you need to move this to up since patch 1/10 needs this.

--Ying
--
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