linux-kernel - Re: Question about task

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Message-ID: <20080610171957.GB6038@tv-sign.ru>
Date:	Tue, 10 Jun 2008 21:19:57 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	lkml <linux-kernel@...r.kernel.org>
Subject: Re: Question about task_struct::state

On 06/10, Dhaval Giani wrote:
> 
> sched.h has a comment in task_struct
> 
>         volatile long state;    /* -1 unrunnable, 0 runnable, >0 stopped */
> 
> After some searching, I've not been able to figure out how state can
> become -1 (or unrunnable). Can you let me know how that happens?
> 
> If it cannot reach that state, then maybe this patch is needed.
> 
> Signed-off-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> 
> Index: linux-2.6/include/linux/sched.h
> ===================================================================
> --- linux-2.6.orig/include/linux/sched.h	2008-06-10 21:13:02.000000000 +0530
> +++ linux-2.6/include/linux/sched.h	2008-06-10 21:14:44.000000000 +0530
> @@ -1024,7 +1024,7 @@ struct sched_rt_entity {
>  };
>  
>  struct task_struct {
> -	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
> +	volatile long state;	/* 0 runnable, >0 stopped */

I think you are right, the comment is wrong (obsolete?).

Perhaps it is better to just remove it, or add a note about TASK_RUNNING/etc
above. ">0 stopped" looks a bit confusing too.

I'd suggest you to change the subject and send the patch to Andrew.

Oleg.

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