linux-kernel - Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer

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Message-ID: <20070423231926.GA684@tv-sign.ru>
Date:	Tue, 24 Apr 2007 03:19:26 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>, ego@...ibm.com,
	linux-kernel@...r.kernel.org, vatsa@...ibm.com, paulmck@...ibm.com,
	pavel@....cz
Subject: Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags

On 04/24, Rafael J. Wysocki wrote:
>
> On Tuesday, 24 April 2007 00:55, Oleg Nesterov wrote:
> > On 04/24, Rafael J. Wysocki wrote:
> > >
> > > Should I clear it in dup_task_struct() or is there a better place?
> > 
> > I personally think we should do this in dup_task_struct(). In fact, I believe
> > it is better to replace the
> > 
> > 	*tsk = *orig;
> > 
> > with some helper (like setup_thread_stack() below), and that helper clears
> > ->freezer_flags. Say, copy_task_struct().
> 
> Hmm, wouldn't that be overkill?  copy_task_struct() would have to do
> *tsk = *orig anyway, and we only need to clear one field apart from this.
> 
> Some other fields are cleared towards the end of dup_task_struct(), so perhaps
> we could clear freezer_flags in there too?

Yes. And I strongly believe it is bad we don't have the helper which does some
random stuf like "p->did_exec = 0".

The same for thread_info. Could you answer quickly where do we clear TIF_FREEZE
currently? We don't.

Oleg.

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