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Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4

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On Tue, Oct 06, 2015 at 09:45:14AM -0700, Paul E. McKenney wrote:
> Hello!
> 
> This series contains performance improvements and locktorture testing
> for percpu-rwsem:
> 
> 1.	Add rtmutex torturing to locktorture, courtesy of Davidlohr Bueso.
> 
> 2.	Add exports to allow locktorture to be built as a module.
> 
> 3.	Add torture tests for percpu-rwsem.
> 
> 4.	Consolidate cond_resched_rcu_qs() into stutter_wait().
> 
> 5.	Create rcu_sync infrastructure, courtesy of Oleg Nesterov.
> 
> 6.	Simplify rcu_sync using new rcu_sync_ops structure, courtesy
> 	of Oleg Nesterov.
> 
> 7.	Add CONFIG_PROVE_RCU checks for rcu_sync, courtesy of Oleg Nesterov.
> 
> 8.	Introduce rcu_sync_dtor(), courtesy of Oleg Nesterov.
> 
> 9.	Make percpu_free_rwsem() after kzalloc() safe, courtesy of Oleg
> 	Nesterov.
> 
> 10.	Make percpu-rwsem make use of rcu_sync, courtesy of Oleg Nesterov.
> 
> 11.	Fix the comments outdated by rcu_sync, courtesy of Oleg Nesterov.
> 
> 12.	Clean up the lockdep annotations in percpu_down_read(), courtesy
> 	Peter Zijlstra and of Oleg Nesterov.
> 
> 13.	Cleanup the CONFIG_PROVE_RCU checks, courtesy of Oleg Nesterov.

For all 13:
Reviewed-by: Josh Triplett <josh@joshtriplett.org>

Regarding the rcu_sync infrastructure: odd that an atomic read
on the reader proves ligher weight than
rcu_read_lock()/rcu_read_unlock().
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[PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
  [PATCH tip/core/rcu 02/13] locking/percpu-rwsem: Export symbols for locktorture "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
  [PATCH tip/core/rcu 07/13] rcu_sync: Add CONFIG_PROVE_RCU checks "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
  [PATCH tip/core/rcu 05/13] rcu: Create rcu_sync infrastructure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
  [PATCH tip/core/rcu 01/13] locktorture: Support rtmutex torturing "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 09/13] locking/percpu-rwsem: Make percpu_free_rwsem() after kzalloc() safe "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 04/13] torture: Consolidate cond_resched_rcu_qs() into stutter_wait() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 12/13] locking/percpu-rwsem: Clean up the lockdep annotations in percpu_down_read() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 08/13] rcu_sync: Introduce rcu_sync_dtor() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 06/13] rcu_sync: Simplify rcu_sync using new rcu_sync_ops structure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 11/13] locking/percpu-rwsem: Fix the comments outdated by rcu_sync "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 18:50 +0200
    [PATCH tip/core/rcu 13/13] rcu_sync: Cleanup the CONFIG_PROVE_RCU checks "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 19:00 +0200
    [PATCH tip/core/rcu 03/13] locktorture: Add torture tests for percpu_rwsem "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 19:00 +0200
    [PATCH tip/core/rcu 10/13] locking/percpu-rwsem: Make use of the rcu_sync infrastructure "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 19:00 +0200
  Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4 Josh Triplett <josh@joshtriplett.org> - 2015-10-06 19:50 +0200
    Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4 Oleg Nesterov <oleg@redhat.com> - 2015-10-06 21:00 +0200
      Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-10-06 21:40 +0200
        Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4 Josh Triplett <josh@joshtriplett.org> - 2015-10-06 22:40 +0200

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