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Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12

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From Peter Zijlstra <peterz@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12
Date Wed, 19 Apr 2017 15:20:01 +0200
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On Wed, Apr 19, 2017 at 06:02:45AM -0700, Paul E. McKenney wrote:
> On Wed, Apr 19, 2017 at 01:28:45PM +0200, Peter Zijlstra wrote:
> > 
> > So the thing Maz complained about is because KVM assumes
> > synchronize_srcu() is 'free' when there is no srcu_read_lock() activity.
> > This series 'breaks' that.
> > 
> > I've not looked hard enough at the new SRCU to see if its possible to
> > re-instate that feature.
> 
> And with the fix I gave Maz, the parallelized version is near enough
> to being free as well.  It was just a stupid bug on my part: I forgot
> to check for expedited when scheduling callbacks.

Right, although for the old SRCU it was true for !expedited as well.
Just turns out the KVM memslots crud already uses
synchronize_srcu_expedited().

<rant>without a friggin' comment; hate @expedited</rant>

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[PATCH tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
    Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-13 11:20 +0200
      Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 18:10 +0200
        Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-13 18:30 +0200
          Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:00 +0200
            Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-13 19:10 +0200
              Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:40 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-13 19:50 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 20:20 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-13 20:30 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 20:50 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-19 15:30 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-19 15:50 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 17:10 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-19 17:50 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:20 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 17:00 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick Peter Zijlstra <peterz@infradead.org> - 2017-04-13 20:40 +0200
                Re: [PATCH tip/core/rcu 04/13] rcu: Make RCU_FANOUT_LEAF help text  more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 21:50 +0200
  [PATCH tip/core/rcu 13/13] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 09/13] mm: Use static initialization for "srcu" "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 12/13] rcu: Use true/false in assignment to bool "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 05/13] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 03/13] types: Update obsolete callback_head comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 11/13] rcu: Use bool value directly "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 10/13] torture: Use correct path for Kconfig fragment for duplicates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 02/13] lockdep: Use "WARNING" tag on lockdep splats "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
    Re: [PATCH tip/core/rcu 02/13] lockdep: Use "WARNING" tag on lockdep  splats Peter Zijlstra <peterz@infradead.org> - 2017-04-13 11:20 +0200
      Re: [PATCH tip/core/rcu 02/13] lockdep: Use "WARNING" tag on lockdep  splats "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 18:10 +0200
  [PATCH tip/core/rcu 06/13] hlist_add_tail_rcu disable sparse warning "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:00 +0200
  [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-12 19:10 +0200
    Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU Peter Zijlstra <peterz@infradead.org> - 2017-04-13 11:20 +0200
      Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU Vlastimil Babka <vbabka@suse.cz> - 2017-04-13 13:10 +0200
        Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 18:10 +0200
        Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU Peter Zijlstra <peterz@infradead.org> - 2017-04-13 18:20 +0200
          Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-13 19:30 +0200
          Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU Eric Dumazet <edumazet@google.com> - 2017-04-13 23:40 +0200
            Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU Peter Zijlstra <peterz@infradead.org> - 2017-04-14 10:50 +0200
              Re: [PATCH tip/core/rcu 01/13] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-14 15:50 +0200
  [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:30 +0200
    [PATCH v2 tip/core/rcu 11/11] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:30 +0200
    [PATCH v2 tip/core/rcu 03/11] types: Update obsolete callback_head comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:30 +0200
    [PATCH v2 tip/core/rcu 06/11] hlist_add_tail_rcu disable sparse warning "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:30 +0200
    [PATCH v2 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
      Re: [PATCH v2 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help  text more explicit about skew_tick Josh Triplett <josh@joshtriplett.org> - 2017-04-18 02:20 +0200
        Re: [PATCH v2 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help  text more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 20:50 +0200
    [PATCH v2 tip/core/rcu 05/11] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
    [PATCH v2 tip/core/rcu 08/11] torture: Use correct path for Kconfig fragment for duplicates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
    [PATCH v2 tip/core/rcu 09/11] rcu: Use bool value directly "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
    [PATCH v2 tip/core/rcu 10/11] rcu: Use true/false in assignment to bool "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
    [PATCH v2 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
      Re: [PATCH v2 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to  SLAB_TYPESAFE_BY_RCU David Rientjes <rientjes@google.com> - 2017-04-18 02:20 +0200
    [PATCH v2 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on lockdep splats "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
      Re: [PATCH v2 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on  lockdep splats Josh Triplett <josh@joshtriplett.org> - 2017-04-19 17:10 +0200
        Re: [PATCH v2 tip/core/rcu 02/11] lockdep: Use "WARNING" tag on  lockdep splats "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:30 +0200
    [PATCH v2 tip/core/rcu 07/11] rcu: Improve comments for hotplug/suspend/hibernate functions "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-18 01:40 +0200
    Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 13:30 +0200
      Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 13:40 +0200
      Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Christian Borntraeger <borntraeger@de.ibm.com> - 2017-04-19 13:50 +0200
        Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 14:10 +0200
          Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Marc Zyngier <marc.zyngier@arm.com> - 2017-04-19 15:00 +0200
          Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 16:50 +0200
            Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Josh Triplett <josh@joshtriplett.org> - 2017-04-19 17:00 +0200
              Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 17:10 +0200
                Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 17:20 +0200
            Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 17:00 +0200
              Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 17:20 +0200
        Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 15:30 +0200
          Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Christian Borntraeger <borntraeger@de.ibm.com> - 2017-04-19 15:30 +0200
      Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 15:10 +0200
        Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 15:20 +0200
          Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 17:40 +0200
            Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 Peter Zijlstra <peterz@infradead.org> - 2017-04-19 17:50 +0200
              Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:20 +0200
    Re: [PATCH v2 tip/core/rcu 0/13] Miscellaneous fixes for 4.12 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 06/11] hlist_add_tail_rcu disable sparse warning "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 11/11] rcu: Fix typo in PER_RCU_NODE_PERIOD header comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 05/11] rcu: Remove obsolete comment from rcu_future_gp_cleanup() header "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 08/11] torture: Use correct path for Kconfig fragment for duplicates "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 03/11] types: Update obsolete callback_head comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 10/11] rcu: Use true/false in assignment to bool "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 07/11] rcu: Improve comments for hotplug/suspend/hibernate functions "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 18:50 +0200
      [PATCH v3 tip/core/rcu 04/11] rcu: Make RCU_FANOUT_LEAF help text more explicit about skew_tick "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200
      [PATCH v3 tip/core/rcu 01/11] mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-04-19 19:00 +0200

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