linux-kernel - Re: [RFC PATCH 2/2] cgroup/freezer: add per freezer duty ratio control

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Date:	Wed, 2 Feb 2011 11:32:53 -0800
From:	jacob pan <jacob.jun.pan@...ux.intel.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	container cgroup <containers@...ts.linux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>,
	Paul Menage <menage@...gle.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Matt Helsley <matthltc@...ibm.com>
Subject: Re: [RFC PATCH 2/2] cgroup/freezer: add per freezer duty ratio
 control

On Tue, 1 Feb 2011 16:23:01 +0200
"Kirill A. Shutemov" <kirill@...temov.name> wrote:

Thanks for your review, I will fix the error handling. Please also see
my comments on create vs populate.
> On Wed, Dec 01, 2010 at 11:00:12AM -0800,
> jacob.jun.pan@...ux.intel.com wrote:
> > From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
>
> > +#define FREEZER_KH_PREFIX  "freezer_"
> >  static int freezer_populate(struct cgroup_subsys *ss, struct
> > cgroup *cgroup) {
> > +	int ret = 0;
> > +	char thread_name[32];
> > +	struct freezer *freezer;
> > +
> >  	if (!cgroup->parent)
> >  		return 0;
> > -	return cgroup_add_files(cgroup, ss, files,
> > ARRAY_SIZE(files)); +
> > +	freezer = cgroup_freezer(cgroup);
> > +	ret = cgroup_add_files(cgroup, ss, files,
> > ARRAY_SIZE(files)); +
> > +	snprintf(thread_name, 32, "%s%s", FREEZER_KH_PREFIX,
> > +		cgroup->dentry->d_name.name);
> > +	freezer->fkh = kthread_run(freezer_kh, (void *)cgroup,
> > thread_name);
> > +	if (!IS_ERR(freezer_task))
> > +		return 0;
> > +	return ret;
> 
> Why do you create on freezer_populate, not on freezer_create?
I want to use the cgroup directory name for the kernel thread. If I do
that in create() instead of populate, I would have to add more changes:
1. pass dentry to the create function since that is called before
  cgroup_create_dir()
2. skip the dummy root as part of the initialization.
So I chose to use populate, are there any issues with the functionality?

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