[GIT PULL rcu/urgent] Fixes for 3.16

[GIT PULL rcu/urgent] Fixes for 3.16

[Paul E. McKenney]

Hello, Ingo,

This series includes the following:

1.	Export a pair of debug-object interfaces for RCU that will
	allow the slab allocators to avoid a recursion bug located
	by Sasha Levin.  Strictly speaking, this is not a regression,
	but it would be good to enable the fix.

2.	Address a serious performance regression on an open/close
	micro-benchmark located by Dave Hansen.  The offending commit
	is ac1bea85781e (Make cond_resched() report RCU quiescent states).

Both have been exposed to -next testing, and are available in the git
repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git urgent.2014.06.23a

for you to fetch changes up to 4a81e8328d3791a4f99bf5b436d050f6dc5ffea3:

  rcu: Reduce overhead of cond_resched() checks for RCU (2014-06-23 11:19:32 -0700)

----------------------------------------------------------------
Paul E. McKenney (2):
      rcu: Export debug_init_rcu_head() and and debug_init_rcu_head()
      rcu: Reduce overhead of cond_resched() checks for RCU

 Documentation/kernel-parameters.txt |   6 ++
 include/linux/rcupdate.h            |  46 +++---------
 kernel/rcu/tree.c                   | 140 ++++++++++++++++++++++++++++--------
 kernel/rcu/tree.h                   |   6 +-
 kernel/rcu/tree_plugin.h            |   2 +-
 kernel/rcu/update.c                 |  22 +-----
 kernel/sched/core.c                 |   7 +-
 7 files changed, 137 insertions(+), 92 deletions(-)

Re: [GIT PULL rcu/urgent] Fixes for 3.16

[Ingo Molnar]

* Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote:

> Hello, Ingo,
> 
> This series includes the following:
> 
> 1.	Export a pair of debug-object interfaces for RCU that will
> 	allow the slab allocators to avoid a recursion bug located
> 	by Sasha Levin.  Strictly speaking, this is not a regression,
> 	but it would be good to enable the fix.
> 
> 2.	Address a serious performance regression on an open/close
> 	micro-benchmark located by Dave Hansen.  The offending commit
> 	is ac1bea85781e (Make cond_resched() report RCU quiescent states).
> 
> Both have been exposed to -next testing, and are available in the git
> repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git urgent.2014.06.23a
> 
> for you to fetch changes up to 4a81e8328d3791a4f99bf5b436d050f6dc5ffea3:
> 
>   rcu: Reduce overhead of cond_resched() checks for RCU (2014-06-23 11:19:32 -0700)
> 
> ----------------------------------------------------------------
> Paul E. McKenney (2):
>       rcu: Export debug_init_rcu_head() and and debug_init_rcu_head()
>       rcu: Reduce overhead of cond_resched() checks for RCU
> 
>  Documentation/kernel-parameters.txt |   6 ++
>  include/linux/rcupdate.h            |  46 +++---------
>  kernel/rcu/tree.c                   | 140 ++++++++++++++++++++++++++++--------
>  kernel/rcu/tree.h                   |   6 +-
>  kernel/rcu/tree_plugin.h            |   2 +-
>  kernel/rcu/update.c                 |  22 +-----
>  kernel/sched/core.c                 |   7 +-
>  7 files changed, 137 insertions(+), 92 deletions(-)
> 

Pulled into tip:core/urgent, thanks a lot Paul!

	Ingo