linux-kernel - Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

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Message-ID: <20100506170151.GA30928@atomide.com>
Date:	Thu, 6 May 2010 10:01:51 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	Brian Swetland <swetland@...gle.com>,
	Alan Stern <stern@...land.harvard.edu>,
	mark gross <mgross@...ux.intel.com>, markgross@...gnar.org,
	Len Brown <len.brown@...el.com>, linux-doc@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Oleg Nesterov <oleg@...hat.com>, Tejun Heo <tj@...nel.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [linux-pm] [PATCH 1/8] PM: Add suspend block api.

* Matthew Garrett <mjg@...hat.com> [100506 06:35]:
> On Wed, May 05, 2010 at 04:47:55PM -0700, Tony Lindgren wrote:
> 
> > How about instead the modem driver fails to suspend until it's done?
> 
> Because every attempted suspend requires freezing userspace, suspending 
> devices until you hit one that refuses to suspend, resuming the devies 
> that did suspend and then unfreezing userspace. That's not an attractive 
> option.

But how many times per day are you really suspending? Maybe few tens
of times at most if it's based on some user activity?

Or are you suspending constantly, tens of times per minute even if
there's no user activity?

Regards,

Tony
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