linux-kernel - Re: mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol: remove unnecessary soft limit tree node test'

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Message-ID: <54C2B01D.4070303@roeck-us.net>
Date:	Fri, 23 Jan 2015 12:33:33 -0800
From:	Guenter Roeck <linux@...ck-us.net>
To:	Christoph Lameter <cl@...ux.com>,
	Johannes Weiner <hannes@...xchg.org>
CC:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-next@...r.kernel.org,
	sfr@...b.auug.org.au, mhocko@...e.cz
Subject: Re: mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol:
 remove unnecessary soft limit tree node test'

On 01/23/2015 12:20 PM, Christoph Lameter wrote:
> On Fri, 23 Jan 2015, Johannes Weiner wrote:
>
>>          struct mem_cgroup_tree_per_node *rtpn;
>>          struct mem_cgroup_tree_per_zone *rtpz;
>> -       int tmp, node, zone;
>> +       int node, zone;
>>
>>          for_each_node(node) {
>
> Do for_each_online_node(node) {
>
> instead?
>

Wouldn't that have unintended consequences ? So far
rb tree nodes are allocated even if a node not online;
the above would change that. Are you saying it is
unnecessary to initialize rb tree nodes if the node
is not online ?

Not that I have any idea what is correct, it just seems odd
that the existing code would do all this allocation if it is not
necessary.

Guenter

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