linux-kernel - Re: [PATCH] memcg: clean up soft_limit

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Message-ID: <20111213140844.GB1818@cmpxchg.org>
Date:	Tue, 13 Dec 2011 15:08:44 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Hillf Danton <dhillf@...il.com>, Hugh Dickins <hughd@...gle.com>,
	Balbir Singh <bsingharora@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] memcg: clean up soft_limit_tree properly new

On Mon, Dec 12, 2011 at 03:09:35PM +0100, Michal Hocko wrote:
> And a follow up patch for the proper clean up:
> ---
> >From 4b9f5a1e88496af9f336d1ef37cfdf3754a3ba48 Mon Sep 17 00:00:00 2001
> From: Michal Hocko <mhocko@...e.cz>
> Date: Mon, 12 Dec 2011 15:04:18 +0100
> Subject: [PATCH] memcg: clean up soft_limit_tree properly
> 
> If we are not able to allocate tree nodes for all NUMA nodes then we
> should better clean up those that were allocated otherwise we will leak
> a memory.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.cz>

Acked-by: Johannes Weiner <hannes@...xchg.org>

That being said, I think it's unlikely that the machine even boots
properly if those allocations fail.  But the code looks better this
way and one doesn't have to double take, wondering if anyone else is
taking care of the already allocated objects.
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