linux-kernel - Re: [PATCH, v6 3/3] cgroups: introduce timer slack controller

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Message-ID: <alpine.LFD.2.00.1102150658540.26192@localhost6.localdomain6>
Date:	Tue, 15 Feb 2011 07:04:00 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
cc:	Paul Menage <menage@...gle.com>, Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	jacob.jun.pan@...ux.intel.com,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Matt Helsley <matthltc@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH, v6 3/3] cgroups: introduce timer slack controller

On Tue, 15 Feb 2011, Kirill A. Shutemov wrote:
> On Mon, Feb 14, 2011 at 06:01:06PM +0100, Thomas Gleixner wrote:
> > > I think silent change here is wrong. cpuset returns -EBUSY in similar
> > > case.
> > 
> > And how is cpuset relevant for this ? Not at all. This is about
> > timer_slack and we better have a well defined scheme for all of this
> > and not some cobbled together thing with tons of exceptions and corner
> > cases. Of course undocumented as far the code goes.
> 
> I don't like silent cascade changes. Userspace can implement it if
> needed. -EBUSY is appropriate.

And I don't like totally uncommented code which follows come cobbled
together completely non obvious rules.

It's not about what you like. It's about getting useful functionality
when we add a new infrastructure like this.

So could you please explain what the rules of updating are, so that a
reviewer has a chance to understand the rationale of all this.

Thanks,

	tglx


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