linux-kernel - Re: [RFC,PATCH 5/5] exec: RT sub-thread can livelock and monopolize CPU on exec

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Message-Id: <20070819194552.B9A5E4D058C@magilla.localdomain>
Date:	Sun, 19 Aug 2007 12:45:52 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gautham R Shenoy <ego@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC,PATCH 5/5] exec: RT sub-thread can livelock and monopolize CPU on exec

> The group_leader can sleep before it enters exit_notify(). In that case
> wait_task_inactive() returns, and we still need some polling to wait for
> EXIT_ZOMBIE.

It could be a loop as now with yield.  It's still polling, but only one
poll per wakeup of the target.

> Yes sure. But in any case I think we should avoid polling, we need some
> notification from exit_notify().

Indeed.


Thanks,
Roland
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