linux-kernel - Re: [RFC][PATCH 2/3] PM: Make console suspending configureable

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Message-Id: <200609041303.25817.rjw@sisk.pl>
Date:	Mon, 4 Sep 2006 13:03:25 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Stefan Seyfried <seife@...e.de>
Cc:	Linux PM <linux-pm@...l.org>, LKML <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@...e.cz>
Subject: Re: [RFC][PATCH 2/3] PM: Make console suspending configureable

On Monday, 4 September 2006 11:08, Stefan Seyfried wrote:
> Hi,
> 
> sorry, i am only slowly catching up after vacation.
> 
> On Wed, Aug 16, 2006 at 01:09:34PM +0200, Rafael J. Wysocki wrote:
> > Change suspend_console() so that it waits for all consoles to flush the
> > remaining messages and make it possible to switch the console suspending
> > off with the help of a Kconfig option.
> > 
> > Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> 
> > +#ifndef CONFIG_DISABLE_CONSOLE_SUSPEND
> >  /**
> >   * suspend_console - suspend the console subsystem
> >   *
> > @@ -709,8 +710,14 @@ int __init add_preferred_console(char *n
> >   */
> >  void suspend_console(void)
> >  {
> > +	printk("Suspending console(s)\n");
> >  	acquire_console_sem();
> >  	console_suspended = 1;
> > +	/* This is needed so that all of the messages that have already been
> > +	 * written to all consoles can be actually transmitted (eg. over a
> > +	 * network) before we try to suspend the consoles' devices.
> > +	 */
> > +	ssleep(2);
> 
> Sorry, but no. Suspend and resume is already slow enough, no need to make
> both of them much slower.
> If we can condition this on the netconsole being used, ok, but not for the
> most common case of "console is on plain VGA".

Hm, it already is in -mm, but of course I can prepare a patch that removes
this ssleep().

Pavel, what do you think?

Rafael


-- 
You never change things by fighting the existing reality.
		R. Buckminster Fuller

-- 
VGER BF report: H 4.55007e-15
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