linux-kernel - Re: [PATCH tip/core/rcu 07/45] torture: Allow variations of "defconfig" to be specified

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Message-ID: <20140508024324.GY8754@linux.vnet.ibm.com>
Date:	Wed, 7 May 2014 19:43:24 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	darren@...art.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu
Subject: Re: [PATCH tip/core/rcu 07/45] torture: Allow variations of
 "defconfig" to be specified

On Wed, May 07, 2014 at 06:54:08PM -0700, Josh Triplett wrote:
> On Wed, May 07, 2014 at 04:52:40PM -0700, Paul E. McKenney wrote:
> > On Wed, May 07, 2014 at 02:22:19PM -0700, josh@...htriplett.org wrote:
> > > On Mon, Apr 28, 2014 at 05:24:55PM -0700, Paul E. McKenney wrote:
> > > > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > > > 
> > > > Some environments require some variation on "make defconfig" to initialize
> > > > the .config file.  This commit therefore adds a --defconfig argument to
> > > > allow this to be specified.  The default value is of course "defconfig".
> > > > 
> > > > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > > 
> > > <bikeshed color="blue">
> > > "--defconfig randconfig" or "--defconfig allyesconfig" or similar seems
> > > rather odd; how about calling it --kconfig or similar?
> > > </bikeshed>
> > 
> > Some day I am going to have to feed that to a browser and see what
> > happens.  ;-)
> > 
> > I must confess that I hadn't considered feeding randconfig or allyesconfig
> > to that argument, partly because I figured that I would have to also
> > supply Kconfig constraints in those cases in order to ensure that the
> > resulting kernel would actually run under qemu.  I was instead thinking
> > in terms of a --configs option beginning with "RAND", which would pick
> > up the Kconfig constraints from the appropriate configs directory,
> > for example:
> > 
> > 	tools/testing/selftests/rcutorture/configs/rcu/RAND1
> > 
> > That said, I haven't thought that far down that path.
> > 
> > So for the --defconfig argument, I was thinking more in terms of things
> > like pseries_defconfig or versatile_defconfig.
> 
> Ah, I see.  --defconfig specifies the base configuration, while
> --configs specifies the constraints.  In that case, how about
> --baseconfig?  It might still make sense to pass --baseconfig
> allnoconfig or --baseconfig allyesconfig or --baseconfig randconfig,
> given a sufficiently complete constraints file.

My choice of name was guided by the following:

	$ find arch -name '*defconfig*' -print | wc -l
	469

When I try baseconfig:

	$ find arch -name '*baseconfig*' -print | wc -l
	0

Don't get me wrong, you might be correct here.  But the thing is that
I like being able to specify all tests in one go.  That means that I
want to still be able to run my current defconfig-based config files
(e.g., TREE01) when I get a randconfig-based setup going.  So I would
like to be able to specify something like:

	sh kvm.sh --defconfig pseries_defconfig --configs "TREE01 RAND01"

But perhaps there is a better way to do this.

						Thanx, Paul

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