linux-kernel - Re: echo mem > /sys/power/state

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Date:	Fri, 18 Jan 2008 15:26:15 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Zan Lynx <zlynx@....org>, Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: echo mem > /sys/power/state

On Friday, 18 of January 2008, Ingo Molnar wrote:
> 
> * Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > > (it doesnt matter if graphics does not resume fine - at least for my 
> > > tests)
> > > 
> > > kprobes had similar problems and it now has a few simple smoke-tests 
> > > - which i just saw trigger on a patch that i did not notice would 
> > > break kprobes. I think this should be done for all functionality 
> > > that is not regularly triggered by a normal distro bootup (and which 
> > > is easy to overlook in testing).
> > 
> > Seeing as we're so lame about being able to distribute userspace 
> > stuff: create a shell script in /proc/rc.kernel and start teaching 
> > initscripts to run it.  Then we can modify it at will.
> 
> would be fine to me.

Yes, that might work.

> The problem isnt just distribution and the tests
> getting out of sync with the kernel (and its capabilities enabled in the 
> .config, etc.), the other problem is unintrusive testing: i for example 
> use unmodified images of various distributions, with only a new bzImage 
> plopped in. That is an intentionally minimal impact test vector, any 
> userspace side changes are discouraged. And that's how many people test 
> new kernels, they just plop it in. The moment we require any userlevel 
> changes, the testing barrier increases significantly.

Very true.

Greetings,
Rafael
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