linux-kernel - Re: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang

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Message-Id: <20070815113308.b3e16cc7.akpm@linux-foundation.org>
Date:	Wed, 15 Aug 2007 11:33:08 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>, Paul Jackson <pj@....com>,
	clameter@....com, dhaval@...ux.vnet.ibm.com, bob.picco@...com,
	nacc@...ibm.com, kamezawa.hiroyu@...fujitsu.com, mel@...net.ie,
	balbir@...ibm.com, vatsa@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org, ckrm-tech@...ts.sourceforge.net
Subject: Re: Regression in 2.6.23-rc2-mm2, mounting cpusets causes a hang

On Wed, 15 Aug 2007 14:00:29 -0400
Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:

> On Wed, 2007-08-15 at 12:12 -0500, Serge E. Hallyn wrote:
> > Quoting Paul Jackson (pj@....com):
> > > Lee wrote:
> > > > [altho' methinks CPUSET should select CONTAINERS rather than
> > > > depend on it...]
> > > 
> > > Good point -- what do you think, Paul Menage?
> > 
> > Paul mentioned (http://www.spinics.net/lists/linux-containers/msg03775.html)
> > that he was asked not to use select in Kconfigs any more.
> 
> That is unfortunate.  I view CPUSET is a "first class" option that
> happens to be built on CONTAINERS.  IMO, I shouldn't have to know this
> implementation detail in order to select CPUSET--indeed, even to be
> offered the optio--in 'make *config'.  However, it will be hidden if I
> haven't already selected containers.  Or do I misunderstand the
> implications of "depends on"?
> 
> Andrew:  is the problem with select something fatal or just too
> difficult to fix?
> 

I don't recall what specifically went wrong when we were using select
in there, but it was pretty ugly.

We're hitting more and more problems with this "select is
broken"-versus-"depends-on user inferface sucks" problem.  I do think that
a suitable fix could be found at the user interface level: show the
"cpusets" option to the user, but don't let them select it.  Instead, tell
the user what needs to be enabled so they can access this option.

But I haven't seen the slightest sign of anyone thinking about doing
anything along those lines.

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