linux-kernel - Re: [PATCH] fs, proc: Introduce /proc/<pid>/task/<tid>/children entry v7

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Message-ID: <m1ty3r1e0y.fsf@fess.ebiederm.org>
Date:	Thu, 19 Jan 2012 15:14:05 -0800
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Tejun Heo <tj@...nel.org>, Andrew Vagin <avagin@...nvz.org>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: [PATCH] fs, proc: Introduce /proc/<pid>/task/<tid>/children entry v7

Cyrill Gorcunov <gorcunov@...il.com> writes:

> On Thu, Jan 19, 2012 at 06:57:00PM +0100, Oleg Nesterov wrote:
>> On 01/19, Cyrill Gorcunov wrote:
>> >
>> > On Thu, Jan 19, 2012 at 07:51:12PM +0400, Cyrill Gorcunov wrote:
>> > > If it's needed I can wrap all this with CONFIG_CHECKPOINT_RESTORE, should I?
>> > >
>> > > ---
>> >
>> > Oleg, if only I'm not missing something obvious you meant handling like below?
>> 
>> Yes, but...
>> 
>> > +struct proc_pid_children_iter {
>> > +	struct pid_namespace *pid_ns;
>> > +	struct pid *parent_pid;
>> > +};
>> 
>> you forgot to remove this definition.
>> 
>
> No, I rather forgot to quilt refresh :)
>
>> > +static int children_seq_show(struct seq_file *seq, void *v)
>> > +{
>> > +	struct inode *inode = seq->private;
>> > +	unsigned long pid;
>> > +
>> > +	pid = (unsigned long)pid_nr_ns(v, inode->i_sb->s_fs_info);
>> > +	return seq_printf(seq, " %lu", pid);
>> > +}
>> 
>> just noticed... why unsigned long and %lu? afaics pid_t/%d should work
>> without any typecasts.
>> 
>
> I'm not sure how important it is, but Andrew mentioned in one of email
> that we might be moving from pid_t from int to long one day (which of
> course will require extreme huge work on checking code where int->long
> transition might cause problems). So I thought why should I wait then?
>
> [ Andrew, am I correct? ]

It is going to take a lot to get to a > 32bit pid value.  I would not
worry about it today unless there is some 64bit arch somewhere that defines
pid_t as long.

Eric
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