linux-kernel - Re: [PATCH 4.4 048/118] cpuset: make sure new tasks conform to the current config of the cpuset

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Date:   Mon, 26 Sep 2016 17:44:24 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Zefan Li <lizefan@...wei.com>, Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH 4.4 048/118] cpuset: make sure new tasks conform to the current config of the cpuset

On Mon, 26 Sep 2016 17:38:22 +0200,
Greg Kroah-Hartman wrote:
> 
> On Mon, Sep 26, 2016 at 02:34:33PM +0200, Takashi Iwai wrote:
> > On Thu, 22 Sep 2016 19:29:08 +0200,
> > Greg Kroah-Hartman wrote:
> > > 
> > > 4.4-stable review patch.  If anyone has any objections, please let me know.
> > > 
> > > ------------------
> > > 
> > > From: Zefan Li <lizefan@...wei.com>
> > > 
> > > commit 06f4e94898918bcad00cdd4d349313a439d6911e upstream.
> > > 
> > > A new task inherits cpus_allowed and mems_allowed masks from its parent,
> > > but if someone changes cpuset's config by writing to cpuset.cpus/cpuset.mems
> > > before this new task is inserted into the cgroup's task list, the new task
> > > won't be updated accordingly.
> > > 
> > > Signed-off-by: Zefan Li <lizefan@...wei.com>
> > > Signed-off-by: Tejun Heo <tj@...nel.org>
> > > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > > 
> > > ---
> > >  kernel/cpuset.c |   15 +++++++++++++++
> > >  1 file changed, 15 insertions(+)
> > > 
> > > --- a/kernel/cpuset.c
> > > +++ b/kernel/cpuset.c
> > > @@ -2074,6 +2074,20 @@ static void cpuset_bind(struct cgroup_su
> > >  	mutex_unlock(&cpuset_mutex);
> > >  }
> > >  
> > > +/*
> > > + * Make sure the new task conform to the current state of its parent,
> > > + * which could have been changed by cpuset just after it inherits the
> > > + * state from the parent and before it sits on the cgroup's task list.
> > > + */
> > > +void cpuset_fork(struct task_struct *task)
> > 
> > This causes a build warning:
> > 
> >   kernel/cpuset.c:2101:2: warning: (near initialization for 'cpuset_cgrp_subsys.fork') [enabled by default]
> >   .fork  = cpuset_fork,
> >   ^
> > 
> > where fork op in 4.4 kernel has still priv argument that was dropped
> > recently.
> 
> Thanks, I have a patch in my tree already for this and it will show up
> in the next release.

Great, thanks!


Takashi