sched/core: implement and cpuhog

Hello, Ingo.

Can you please pull from the following git tree into sched/core to
receive cpuhog patches?

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git cpuhog

Both sched/core and the patches remained the same from the second
take[2].  Rusty Russell acked stop_machine changes and Oleg likes the
changes.

Peter agrees with the mechanics but is unhappy with the naming and
suggests using stop_cpu/machine() names instead.  Currently, visible
API is

* hog_one_cpu()
* hog_cpus()
* [__]stop_machine()

IIUC, Peter is suggesting something like (please feel free to correct
if I got it wrong)

* stop_one_cpu()
* stop_cpus()
* [__]stop_machine()

The renaming shouldn't be difficult one way or the other but I think
hog is better because it better describes what the API does (it
doesn't really stop the cpu or cpus).  Please refer to the discussions
in the first take[1] and second take[2] for details.

The branch contains the following changes.

Tejun Heo (4):
      cpuhog: implement cpuhog
      stop_machine: reimplement using cpuhog
      scheduler: replace migration_thread with cpuhog
      scheduler: kill paranoia check in synchronize_sched_expedited()

 Documentation/RCU/torture.txt |   10 -
 arch/s390/kernel/time.c       |    1 -
 drivers/xen/manage.c          |   14 +--
 include/linux/cpuhog.h        |   24 +++
 include/linux/rcutiny.h       |    2 -
 include/linux/rcutree.h       |    1 -
 include/linux/stop_machine.h  |   20 ---
 kernel/Makefile               |    2 +-
 kernel/cpu.c                  |    8 -
 kernel/cpuhog.c               |  368 +++++++++++++++++++++++++++++++++++++++++
 kernel/module.c               |   14 +--
 kernel/rcutorture.c           |    2 +-
 kernel/sched.c                |  282 ++++++--------------------------
 kernel/sched_fair.c           |   39 +++--
 kernel/stop_machine.c         |  162 +++++--------------
 15 files changed, 511 insertions(+), 438 deletions(-)
 create mode 100644 include/linux/cpuhog.h
 create mode 100644 kernel/cpuhog.c

Thanks.

-- 
tejun

[1] http://thread.gmane.org/gmane.linux.kernel/958743
[2] http://thread.gmane.org/gmane.linux.kernel/962635
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