linux-kernel - Re: [Patch 16/21] Wait for threads to freeze

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Message-ID: <20101214164203.GI11400@redhat.com>
Date:	Tue, 14 Dec 2010 17:42:03 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	"Suzuki K. Poulose" <suzuki@...ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Christoph Hellwig <hch@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>,
	Amerigo Wang <amwang@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [Patch 16/21] Wait for threads to freeze

On 12/14, Suzuki K. Poulose wrote:
>
> + * zero_thread_state :
> + * For threads, which are not frozen, we cannot capture the register state.

Indeed, but

> +		if (!tinfo->frozen)
> +			zero_thread_state(tinfo);

Again, we can race with TASK_STOPPED/SIGCONT. And
is_task_frozen_enough() thins task_is_stopped_or_traced() is fine.

Oleg.

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