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

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Date:	Thu, 27 May 2010 00:45:15 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-kernel@...r.kernel.org, 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>,
	Magnus Damm <damm@...l.co.jp>,
	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 Thursday 27 May 2010, Alan Cox wrote:
> > This whole thing is related to the statistics part, which Arve says is
> > essential to him.  He wants to collect statistics for each suspend blocker
> > activated and deactivated so that he can tell who's causing problems by
> > blocking suspend too often.  The name also is a part of this.
> 
> If he wants to collect stats about misbehaving code then presumably he
> needs reliable stats. Arbitary user set names are not reliable and
> judging by app vendor behaviour in the proprietary space with other such
> examples they will actively name their blockers in a manner specifically
> intended to hide the cause so as to 'reduce support costs'.
> 
> Its a waste of memory (especially if I create a million of them with a
> long name for fun).

Well, I won't argue with that. :-)

> It's all an economic system, proprietary app vendors are in it to make
> money, some will therefore game the system and the rest will be forced to
> follow to keep their playing field fair.

Good point.

Rafael
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