linux-kernel - RE: [PATCH] freezer: configure user space process frozen along with kernel threads

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Date:	Wed, 20 Feb 2013 13:46:47 +0000
From:	"Li, Fei" <fei.li@...el.com>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
CC:	"pavel@....cz" <pavel@....cz>, "rjw@...k.pl" <rjw@...k.pl>,
	"Brown, Len" <len.brown@...el.com>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"rientjes@...gle.com" <rientjes@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"Liu, Chuansheng" <chuansheng.liu@...el.com>,
	"Wang, Biao" <biao.wang@...el.com>
Subject: RE: [PATCH] freezer: configure user space process frozen along with
 kernel threads

> -----Original Message-----
> From: Cyrill Gorcunov [mailto:gorcunov@...il.com] On Behalf Of Cyrill
> Gorcunov
> Sent: Wednesday, February 20, 2013 5:05 PM
> To: Li, Fei
> Cc: pavel@....cz; rjw@...k.pl; Brown, Len; mingo@...hat.com;
> peterz@...radead.org; akpm@...ux-foundation.org; viro@...iv.linux.org.uk;
> ebiederm@...ssion.com; rientjes@...gle.com; linux-kernel@...r.kernel.org;
> linux-pm@...r.kernel.org; Liu, Chuansheng; Wang, Biao
> Subject: Re: [PATCH] freezer: configure user space process frozen along with
> kernel threads
> 
> On Wed, Feb 20, 2013 at 10:15:25AM +0800, Li Fei wrote:
> >
> > +#ifdef CONFIG_FREEZER
> > +
> > +static ssize_t freeze_late_read(struct file *file, char __user *buf,
> > +					size_t count, loff_t *ppos)
> > +{
> > +	struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
> > +	char buffer[PROC_NUMBUF];
> > +	int freeze_late;
> > +	size_t len;
> > +	if (!task)
> > +		return -ESRCH;
> > +	freeze_late = (task->flags & PF_FREEZER_LATE) ? 1 : 0;
> > +	len = snprintf(buffer, sizeof(buffer), "%d\n", freeze_late);
> > +	return simple_read_from_buffer(buf, count, ppos, buffer, len);
> > +}
> 
> Don't you need put_task_struct() once you grabbed it?

Thanks for your reminder. I'll update it in later version.

Best Regards,
Li Fei
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