linux-kernel - Re: [patch 2/2] memcg: simplify the way memory limits are checked

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Date:	Fri, 4 Feb 2011 08:44:33 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	nishimura@....nes.nec.co.jp, balbir@...ux.vnet.ibm.com,
	minchan.kim@...il.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] memcg: simplify the way memory limits are checked

On Thu, 3 Feb 2011 13:56:11 +0100
Johannes Weiner <hannes@...xchg.org> wrote:

> Since transparent huge pages, checking whether memory cgroups are
> below their limits is no longer enough, but the actual amount of
> chargeable space is important.
> 
> To not have more than one limit-checking interface, replace
> memory_cgroup_check_under_limit() and memory_cgroup_check_margin()
> with a single memory_cgroup_margin() that returns the chargeable space
> and leaves the comparison to the callsite.
> 
> Soft limits are now checked the other way round, by using the already
> existing function that returns the amount by which soft limits are
> exceeded: res_counter_soft_limit_excess().
> 
> Also remove all the corresponding functions on the res_counter side
> that are now no longer used.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

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

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