linux-kernel - Re: [PATCH][-mm] memcg : memory cgroup cpu hotplug support update.

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Message-ID: <AANLkTikWqPf_SfYn7fzL7ROGqCY=ZZR5mUzr7sah+TOd@mail.gmail.com>
Date:	Fri, 17 Sep 2010 20:49:09 +0900
From:	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH][-mm] memcg : memory cgroup cpu hotplug support update.

2010/9/17 Balbir Singh <balbir@...ux.vnet.ibm.com>:
> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2010-09-16 16:17:27]:
>
>> On Thu, 16 Sep 2010 15:22:04 +0900
>> KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:
>>
>> > This naming is from mem_cgroup_walk_tree(). Now we have
>> >
>> >   mem_cgroup_walk_tree();
>> >   mem_cgroup_walk_all();
>> >
>> > Rename both ? But it should be in separated patch.
>> >
>>
>> Considering a bit ...but..
>>
>> #define for_each_mem_cgroup(mem) \
>>       for (mem = mem_cgroup_get_first(); \
>>            mem; \
>>            mem = mem_cgroup_get_next(mem);) \
>>
>> seems to need some helper functions. I'll consider about this clean up
>> but it requires some amount of patch because css_get()/css_put()/rcu...etc..
>> are problematic.
>>
>
> Why does this need to be a macro (I know we use this for lists and
> other places), assuming for now we don't use the iterator pattern, we
> can rename mem_cgroup_walk_all() to for_each_mem_cgroup().
>

When I see for_each in the kernel source, I expect iterator and macro.
When I see "walk" in the kernel source, I expect callback and visit function.

Thanks,
-Kame
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