linux-kernel - Re: [RFC 09/16] kgr: mark task

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Date:	Thu, 15 May 2014 00:50:11 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Mike Galbraith <umgwanakikbuti@...il.com>
Cc:	Vojtech Pavlik <vojtech@...e.cz>, Jiri Slaby <jslaby@...e.cz>,
	Jiri Kosina <jkosina@...e.cz>, linux-kernel@...r.kernel.org,
	jirislaby@...il.com, Michael Matz <matz@...e.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Theodore Ts'o <tytso@....edu>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC 09/16] kgr: mark task_safe in some kthreads

Hello, Mike.

On Thu, May 15, 2014 at 06:46:18AM +0200, Mike Galbraith wrote:
> > I think it'd be healthier to identify the use cases and then provide
> > proper interface for it.  Note that workqueue can now expose interface
> > to modify concurrency, priority and cpumask to userland which
> > writeback workers are already using.
> 
> You can't identify a specific thing, any/all of it can land on the
> user's diner plate, so he should be able to make the decisions.  Power
> to the user and all that, if he does something stupid, tuff titty.  User
> getting to call the shots, and getting to keep the pieces when he fscks
> it all up is wonderful stuff, lets kernel people off the hook :)

Do we know specific kthreads which need to be exposed with this way?
If there are good enough reasons for specific ones, sure, but I don't
think "we can't change any of the kthreads because someone might be
diddling with it" is something we can sustain in the long term.

Thanks.

-- 
tejun
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