linux-kernel - Re: [PATCH] move put_task_struct() reaping into a thread [Re: 2.6.18-rt1]

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Message-ID: <20060927140659.GA31025@elte.hu>
Date:	Wed, 27 Sep 2006 16:06:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Bill Huey <billh@...ppy.monkey.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <johnstul@...ibm.com>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] move put_task_struct() reaping into a thread [Re: 2.6.18-rt1]


* Eric W. Biederman <ebiederm@...ssion.com> wrote:

> I'm still wondering if we can move put_task_struct a little lower in 
> the logic in the places where it is called, so it isn't called under a 
> lock, or with preemption disabled.  The only downside I see is that it 
> might convolute the logic into unreadability.

well it's all a function of the task reaping logic: right now we in 
essence complete the reaping from the scheduler, via prev_state == 
TASK_DEAD. We cannot do it sooner because the task is still in use. I 
had one other implementation upstream some time ago, which was a 
single-slot cache for reaped tasks - but that uglified other codepaths 
because _something_ has to notice that the task has been unscheduled.

	Ingo
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