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Date: Thu, 19 Jan 2012 21:07:51 +0400
From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Pavel Emelyanov <xemul@parallels.com>,
        Serge Hallyn <serge.hallyn@canonical.com>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        Tejun Heo <tj@kernel.org>, Andrew Vagin <avagin@openvz.org>,
        Vasiliy Kulikov <segoon@openwall.com>
Subject: Re: [RFC] fs, proc: Introduce /proc/<pid>/task/<tid>/children entry
 v6
Message-ID: <20120119170751.GH31379@moon>
References: <4F15EA53.8030405@gmail.com>
 <20120118135809.GA10105@redhat.com>
 <20120118142156.GR1968@moon>
 <20120118143631.GA11776@redhat.com>
 <20120118182344.GD2889@moon>
 <20120118190725.GE2889@moon>
 <20120119141051.GA9652@redhat.com>
 <20120119155529.GA14412@redhat.com>
 <20120119162718.GA32568@moon>
 <20120119164413.GA16522@redhat.com>
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On Thu, Jan 19, 2012 at 05:44:13PM +0100, Oleg Nesterov wrote:
> On 01/19, Cyrill Gorcunov wrote:
> >
> > On Thu, Jan 19, 2012 at 04:55:29PM +0100, Oleg Nesterov wrote:
> > >
> > > Thinking more... I am not sure, but do we really need
> > > proc_pid_children_iter at all??
> > >
> > > It is very possibly I missed something, but we can get both
> > > parent_pid and pid_ns from inode, right? so can't we just remember
> > > inode in seq->private?
> >
> > Good point. Letme check if we will need to call for ihold then...
> > (/me scratchig the head)
> 
> Why? file/inode can't go away, at least until this fd is closed.
> 
> And just in case, get_pid(proc_pid(inode)) is not needed, even in v6/v7.
> I didn't realize this.
> 

Grr, indeed.

> Cyrill, I won't argue if you prefer to make this in a separate patch
> (of course, assuming you are agree) on top of v7, to me it looks
> "good enough".
> 

I think better to make completely updated version then, than pushing
changes on top. it'll be better to put anything in one patch I think.

Thanks!

	Cyrill