linux-kernel - Re: [PATCH tip/core/rcu 0/5] Documentation and rcutorture changes

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Message-ID: <20120830214603.GJ30381@linux.vnet.ibm.com>
Date:	Thu, 30 Aug 2012 14:46:03 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, 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, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 0/5] Documentation and rcutorture changes

On Thu, Aug 30, 2012 at 11:56:09AM -0700, Josh Triplett wrote:
> On Thu, Aug 30, 2012 at 11:44:48AM -0700, Paul E. McKenney wrote:
> > Hello!
> > 
> > This series covers changes to rcutorture and documentation updates.
> > The individual patches in this series are as follows:
> > 
> > 1.	Update rcutorture default values so that casual rcutorture
> > 	users will do more aggressive testing.
> > 2.	Make rcutorture track CPU-hotplug latency statistics.
> > 3.	Document SRCU's new-found ability to be used by offline and
> > 	idle CPUs, and also emphasize SRCU's limitations.
> > 4.	Use the new pr_*() interfaces in rcutorture.
> > 5.	Prevent kthread-initialization races in rcutorture.
> > 
> > 							Thanx, Paul
> > 
> > ------------------------------------------------------------------------
> > 
> >  b/Documentation/RCU/checklist.txt |    6 +
> >  b/Documentation/RCU/whatisRCU.txt |    9 +-
> >  b/kernel/rcutorture.c             |    4 -
> >  kernel/rcutorture.c               |  152 +++++++++++++++++++++++---------------
> >  4 files changed, 108 insertions(+), 63 deletions(-)
> 
> Something seems wrong with this diffstat; how'd the b/ prefixes get
> there, and why does it list kernel/rcutorture.c twice, once with and
> once without?

Hmmm...  It seems quite reproducible.  I did the usual git-format-patch
and ran the resulting set of patches through diffstat.  I seem to have a
broken diffstat...

However, git diff --stat v3.6-rc1..hotplug.2012.08.28a generates the
following:

 kernel/rcutree.c       |   93 +++++++++++-------------------------------------
 kernel/rcutree.h       |    3 --
 kernel/rcutree_trace.c |    4 +-
 kernel/sched/core.c    |   41 ++++++++++-----------
 4 files changed, 43 insertions(+), 98 deletions(-)

Which does look much better.

							Thanx, Paul

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