linux-kernel - Re: [PATCH take 2] UBIFS

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Date:	Fri, 23 May 2008 18:18:47 +0300
From:	Artem Bityutskiy <dedekind@...dex.ru>
To:	Christoph Hellwig <hch@...radead.org>
CC:	Artem Bityutskiy <Artem.Bityutskiy@...ia.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Adrian Hunter <ext-adrian.hunter@...ia.com>
Subject: Re: [PATCH take 2] UBIFS - new flash file system

Christoph Hellwig wrote:
>  - the mainoop of ubifs_bg_thread looks a bit odd either, when you
>    first to an interruotible sleep and then possible one while you
>    still have TASK_RUNNING set.  Also the need_bgt flag is not needed
>    because the thrad is only woken up to perform it's action.
>    In the end the main loop should look something like:
> 
> 	while (1) {
> 		if (kthread_should_stop())
> 			break;
> 		if (try_to_freeze())
> 			continue;
> 
> 		run_bg_commit(c);
> 
> 		set_current_state(TASK_INTERRUPTIBLE);
> 		schedule();
> 		__set_current_state(TASK_RUNNING);
> 	}

Err, how are we guaranteed that we do not miss wake-up events then,
if we were woken up say, between run_bg_commit(c) and
set_current_state(TASK_INTERRUPTIBLE) ? This was  the purpose
of the 'need_bgt' flag.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)
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