linux-kernel - Re: [PATCH 2/5] cgroup, memcg, cpuset: implement cgroup_taskset_for_each

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Message-ID: <20150914204907.GI25369@htj.duckdns.org>
Date:	Mon, 14 Sep 2015 16:49:07 -0400
From:	Tejun Heo <tj@...nel.org>
To:	lizefan@...wei.com
Cc:	cgroups@...r.kernel.org, hannes@...xchg.org, mhocko@...e.cz,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] cgroup, memcg, cpuset: implement
 cgroup_taskset_for_each_leader()

On Fri, Sep 11, 2015 at 03:00:19PM -0400, Tejun Heo wrote:
> It wasn't explicitly documented but, when a process is being migrated,
> cpuset and memcg depend on cgroup_taskset_first() returning the
> threadgroup leader; however, this approach is somewhat ghetto and
> would no longer work for the planned multi-process migration.
> 
> This patch introduces explicit cgroup_taskset_for_each_leader() which
> iterates over only the threadgroup leaders and replaces
> cgroup_taskset_first() usages for accessing the leader with it.
> 
> This prepares both memcg and cpuset for multi-process migration.  This
> patch also updates the documentation for cgroup_taskset_for_each() to
> clarify the iteration rules and removes comments mentioning task
> ordering in tasksets.
> 
> v2: A previous patch which added threadgroup leader test was dropped.
>     Patch updated accordingly.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Acked-by: Zefan Li <lizefan@...wei.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Michal Hocko <mhocko@...e.cz>

Michal, if you're okay with this patch, I'll apply the patchset in
cgroup/for-4.4.

Thanks.

-- 
tejun
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