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

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Date:	Fri, 4 Feb 2011 09:42:19 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	kamezawa.hiroyu@...fujitsu.com, nishimura@....nes.nec.co.jp,
	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, Feb 3, 2011 at 6:26 PM, 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: Balbir Singh <balbir@...ux.vnet.ibm.com>
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