linux-kernel - Re: [PATCH 08/24] proc: pick out a function to iterate task children

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Date:	Fri, 17 Jul 2015 18:57:29 +0300
From:	Andrew Vagin <avagin@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Andrey Vagin <avagin@...nvz.org>, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Roger Luethi <rl@...lgate.ch>, Arnd Bergmann <arnd@...db.de>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Ahern <dsahern@...il.com>,
	Andy Lutomirski <luto@...capital.net>,
	Pavel Odintsov <pavel.odintsov@...il.com>
Subject: Re: [PATCH 08/24] proc: pick out a function to iterate task children

On Tue, Jul 14, 2015 at 08:02:35PM +0200, Oleg Nesterov wrote:
> On 07/06, Andrey Vagin wrote:
> >
> > -static struct pid *
> > -get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
> > +static struct task_struct *
> > +task_next_child(struct task_struct *parent, struct task_struct *prev, unsigned int pos)
> >  {
> 
> I won't really argue, just a question...
> 
> So this patch changes it to accept/return task_struct rather pid. Why?
> it is better to get/put "struct pid" only, not the whole task_struct.
> 
> If another caller want task_struct, the necessary conversion is simple.

Another caller wants task_struct.

Currently this function receives pid and converts it into task_struct, then
gets the next child and returns its pid. So I try to avoid extra
conversion in task_diag code.

> But again, I won't argue if you think this will complicate the non-proc
> users of this helper.
> 
> Oleg.
> 
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