linux-kernel - Re: [GIT PULL sched/core] cpu_stop: implement and use cpu

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Message-ID: <20100508111529.GA19796@elte.hu>
Date:	Sat, 8 May 2010 13:15:29 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Tejun Heo <tj@...nel.org>
Cc:	peterz@...radead.org, linux-kernel@...r.kernel.org,
	paulmck@...ux.vnet.ibm.com
Subject: Re: [GIT PULL sched/core] cpu_stop: implement and use cpu_stop,
 take#3


* Tejun Heo <tj@...nel.org> wrote:

> Hello, Ingo.
> 
> Please pull from the following branch to receive cpu_stop patches.
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git cpu_stop
> 
> Adding mb()'s in synchronize_sched_expedited() is the only change
> since the last take[2].  Both Peter and Paul have acked the patchset.
> I'll post the patchset as replies to this message.
> 
> This patchset is on top of the current sched/core (99bd5e2f) and
> contains the following changes.
> 
> Paul E. McKenney (1):
>       scheduler: correctly place paranioa memory barriers in synchronize_sched_expedited()
> 
> Tejun Heo (4):
>       cpu_stop: implement stop_cpu[s]()
>       stop_machine: reimplement using cpu_stop
>       scheduler: replace migration_thread with cpu_stop
>       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/rcutiny.h       |    2 -
>  include/linux/rcutree.h       |    1 -
>  include/linux/stop_machine.h  |   59 +++--
>  kernel/cpu.c                  |    8 -
>  kernel/module.c               |   14 +-
>  kernel/rcutorture.c           |    2 +-
>  kernel/sched.c                |  284 +++++-----------------
>  kernel/sched_fair.c           |   48 +++-
>  kernel/stop_machine.c         |  530 +++++++++++++++++++++++++++++++----------
>  12 files changed, 538 insertions(+), 435 deletions(-)

FYI, it doesnt build on x86 allnoconfig:

kernel/sched_fair.c: In function 'load_balance':
kernel/sched_fair.c:2917: error: implicit declaration of function 'stop_one_cpu_nowait'
kernel/sched.c: In function 'sched_exec':
kernel/sched.c:3084: error: implicit declaration of function 'stop_one_cpu'
kernel/sched.c: In function 'synchronize_sched_expedited':

	Ingo
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