linux-kernel - Re: [PATCH 09/23] kmem slab accounting basic infrastructure

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Message-ID: <4F975430.4090107@jp.fujitsu.com>
Date:	Wed, 25 Apr 2012 10:32:32 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Glauber Costa <glommer@...allels.com>
CC:	cgroups@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, devel@...nvz.org,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Greg Thelen <gthelen@...gle.com>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH 09/23] kmem slab accounting basic infrastructure

(2012/04/21 6:57), Glauber Costa wrote:

> This patch adds the basic infrastructure for the accounting of the slab
> caches. To control that, the following files are created:
> 
>  * memory.kmem.usage_in_bytes
>  * memory.kmem.limit_in_bytes
>  * memory.kmem.failcnt
>  * memory.kmem.max_usage_in_bytes
> 
> They have the same meaning of their user memory counterparts. They reflect
> the state of the "kmem" res_counter.
> 
> The code is not enabled until a limit is set. This can be tested by the flag
> "kmem_accounted". This means that after the patch is applied, no behavioral
> changes exists for whoever is still using memcg to control their memory usage.
> 

Hmm, res_counter never goes naeative ?

> We always account to both user and kernel resource_counters. This effectively
> means that an independent kernel limit is in place when the limit is set
> to a lower value than the user memory. A equal or higher value means that the
> user limit will always hit first, meaning that kmem is effectively unlimited.
> 
> People who want to track kernel memory but not limit it, can set this limit
> to a very high number (like RESOURCE_MAX - 1page - that no one will ever hit,
> or equal to the user memory)
> 
> Signed-off-by: Glauber Costa <glommer@...allels.com>
> CC: Michal Hocko <mhocko@...e.cz>
> CC: Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> CC: Johannes Weiner <hannes@...xchg.org>


The code itself seems fine.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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