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

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Date:	Mon, 3 May 2010 14:26:59 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	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>,
	Pavel Machek <pavel@....cz>,
	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, May 3, 2010 at 8:03 AM, Rafael J. Wysocki <rjw@...k.pl> 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.

I think it is important to let user-space specify the name. If a
process uses multiple suspend blockers, it is impossible to tell what
each one is used for if they are automatically named.

-- 
Arve Hjønnevåg
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