linux-kernel - Re: [PATCH 2/8] PM: suspend_block: Add driver to access suspend blockers from user-space

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Message-ID: <20100504041618.GB5326@ucw.cz>
Date:	Tue, 4 May 2010 06:16:19 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Arve Hj?nnev?g <arve@...roid.com>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>,
	Jim Collar <jim.collar@...are.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Avi Kivity <avi@...hat.com>, Len Brown <len.brown@...el.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Nigel Cunningham <nigel@...onice.net>,
	linux-doc@...r.kernel.org
Subject: Re: [PATCH 2/8] PM: suspend_block: Add driver to access suspend
 blockers from user-space

On Mon 2010-05-03 17:03:11, Rafael J. Wysocki wrote:
> On Sunday 02 May 2010, Alan Stern wrote:
> > On Sun, 2 May 2010, Rafael J. Wysocki wrote:
> > 
> > > Hmm.  It doesn't seem to be possible to create two different suspend blockers
> > > using the same file handle.  So, what exactly is a process supposed to do to
> > > use two suspend blockers at the same time?
> > 
> > Open the file twice, thereby obtaining two file handles.
> 
> Well, that's what I thought.
> 
> I must admit I'm not really comfortable with this interface.  IMO it would
> be better if _open() created the suspend blocker giving it a name based on
> the name of the process that called it.  Something like
> "<process name>_<timestamp>" might work at first sight.
> 
> Alternatively, "<process_name><number>", where <number> is 0 for the first
> suspend blocker created by the given process, 1 for the second one etc., also
> seems to be doable.

Yes please.

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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