linux-kernel - Re: [PATCH 3/4] memcg, doc: clarify global vs. limit reclaims

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Message-ID: <20140506195645.GC30921@dhcp22.suse.cz>
Date:	Tue, 6 May 2014 21:56:45 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Greg Thelen <gthelen@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
	Roman Gushchin <klamm@...dex-team.ru>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 3/4] memcg, doc: clarify global vs. limit reclaims

Andrew, could you queue this one please?

On Fri 02-05-14 11:43:51, Michal Hocko wrote:
[...]
> From 30b9505169e574cdb553226e1a361cc527ed492b Mon Sep 17 00:00:00 2001
> From: Michal Hocko <mhocko@...e.cz>
> Date: Fri, 2 May 2014 11:42:35 +0200
> Subject: [PATCH] mmotm: memcg-doc-clarify-global-vs-limit-reclaims-fix.patch
> 
> update doc as per Johannes
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>
> ---
>  Documentation/cgroups/memory.txt | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/Documentation/cgroups/memory.txt b/Documentation/cgroups/memory.txt
> index add1be001416..2cde96787ceb 100644
> --- a/Documentation/cgroups/memory.txt
> +++ b/Documentation/cgroups/memory.txt
> @@ -241,17 +241,9 @@ global VM. Cgroups can get reclaimed basically under two conditions
>     proportionally wrt. their LRU size in a round robin fashion
>   - when a cgroup or its hierarchical parent (see 6. Hierarchical support)
>     hits hard limit. If the reclaim is unsuccessful, an OOM routine is invoked
> -   to select and kill the bulkiest task in the cgroup. (See 10. OOM Control
> +   to select and kill the bulkiest task in the hiearchy. (See 10. OOM Control
>     below.)
>  
> -Global and hard-limit reclaims share the same code the only difference
> -is the objective of the reclaim. The global reclaim aims at balancing
> -zones' watermarks while the limit reclaim frees some memory to allow new
> -charges.
> -
> -NOTE: Hard limit reclaim does not work for the root cgroup, since we cannot set
> -any limits on the root cgroup.
> -
>  Note2: When panic_on_oom is set to "2", the whole system will panic.
>  
>  When oom event notifier is registered, event will be delivered to the root
> -- 
> 2.0.0.rc0
> 
> -- 
> Michal Hocko
> SUSE Labs
> 
> --
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-- 
Michal Hocko
SUSE Labs
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