lkml.org 
[lkml]   [2012]   [Jan]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v3] memcg: remove PCG_CACHE page_cgroup flag
On Fri 20-01-12 12:26:58, KAMEZAWA Hiroyuki wrote:
> I think this version is much simplified.
>
> ==
> From 5700a4fe9c581e1ebaa021ba6119dc8d921b024f Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> Date: Thu, 19 Jan 2012 17:09:41 +0900
> Subject: [PATCH v3] memcg: remove PCG_CACHE
>
> We record 'the page is cache' by PCG_CACHE bit to page_cgroup.
> Here, "CACHE" means anonymous user pages (and SwapCache). This
> doesn't include shmem.
>
> Consdering callers, at charge/uncharge, the caller should know
> what the page is and we don't need to record it by using 1bit
> per page.
>
> This patch removes PCG_CACHE bit and make callers of
> mem_cgroup_charge_statistics() to specify what the page is.
>
> Changelog since v2
> - removed 'not_rss', added 'anon'
> - changed a meaning of arguments to mem_cgroup_charge_statisitcs()
> - removed a patch to mem_cgroup_uncharge_cache
> - simplified comment.
>
> Changelog since RFC.
> - rebased onto memcg-devel
> - rename 'file' to 'not_rss'
> - some cleanup and added comment.
>
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
> ---
> include/linux/page_cgroup.h | 8 +------
> mm/memcontrol.c | 48 +++++++++++++++++++++++-------------------
> 2 files changed, 27 insertions(+), 29 deletions(-)
>
[...]
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index ff24520..f000c82 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -672,15 +672,19 @@ static unsigned long mem_cgroup_read_events(struct mem_cgroup *memcg,
> }
>
> static void mem_cgroup_charge_statistics(struct mem_cgroup *memcg,
> - bool file, int nr_pages)
> + bool rss, int nr_pages)

Can we make this anon as well?
> {
> preempt_disable();
>
> - if (file)
> - __this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_CACHE],
> + /*
> + * Here, RSS means 'mapped anon' and anon's SwapCache. Shmem/tmpfs is
> + * counted as CACHE even if it's on ANON LRU.
> + */
> + if (rss)
> + __this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_RSS],
> nr_pages);
> else
> - __this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_RSS],
> + __this_cpu_add(memcg->stat->count[MEM_CGROUP_STAT_CACHE],
> nr_pages);
>
> /* pagein of a big page is an event. So, ignore page size */
[...]

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


\
 
 \ /
  Last update: 2012-01-20 09:47    [W:0.128 / U:0.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site