Re: [GIT PULL rcu/next] RCU commits for 4.18

[Ingo Molnar]

* Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> wrote:

> Hello, Ingo!
> 
> This pull request contains the following changes:
> 
> 1.	Updates to the handling of expedited grace periods, perhaps most
> 	notably parallelizing their initialization.  Other changes
> 	include fixes from Boqun Feng.
> 
> 	http://lkml.kernel.org/r/20180423022047.GA20189@xxxxxxxxxxxxxxxxxx
> 
> 2.	Miscellaneous fixes.  These include an nvme fix from Nitzan Carmi
> 	that I am carrying because it depends on a new SRCU function
> 	cleanup_srcu_struct_quiesced().  This branch also includes fixes
> 	from Byungchul Park and Yury Norov.  Note that several patches
> 	were deferred to the v4.19 merge window due to late location
> 	of bugs and late determination of a need for restructuring.
> 
> 	http://lkml.kernel.org/r/20180423023150.GA21533@xxxxxxxxxxxxxxxxxx
> 
> 3.	Updates to reduce lock contention in the rcu_node combining tree.
> 	These are in preparation for the consolidation of RCU-bh,
> 	RCU-preempt, and RCU-sched into a single flavor, which was
> 	requested by Linus Torvalds in response to a security flaw
> 	whose root cause included confusion between the multiple flavors
> 	of RCU.  There will be another series of contention-reduction
> 	patches in the next merge window, hopefully accompanied by the
> 	consolidation itself.
> 
> 	http://lkml.kernel.org/r/20180423030258.GA23370@xxxxxxxxxxxxxxxxxx
> 
> 4.	Torture-test updates that save their users some time and effort.
> 
> 	http://lkml.kernel.org/r/20180423031346.GA28371@xxxxxxxxxxxxxxxxxx
> 
> The nvme patch called out in #2 above has a conflict with a commit in
> Linus's tree, which was reported by Stephen Rothwell in the course of
> his -next testing.  He is carrying a resolution to this conflict as
> reported on LKML here:
> 
> http://lkml.kernel.org/r/20180514134636.61831bcc@xxxxxxxxxxxxxxxx
> 
> This resolution looks good to me.
> 
> All of these changes have been subjected to 0day Test Robot and -next
> testing, and are available in the git repository at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo
> 
> for you to fetch changes up to 22df7316ac71dc1ac57415349938737d2a229c59:
> 
>   Merge branches 'exp.2018.05.15a', 'fixes.2018.05.15a', 'lock.2018.05.15a' and 'torture.2018.05.15a' into HEAD (2018-05-15 10:33:05 -0700)
> 
> This merge commit is quite recent, however, the changes are exactly
> the same as the previous merge commit (434533a52e8d) dated April 30th.
> The only difference is the addition of Nick Piggin's Tested-by to all
> of the commit logs (thank you, Nick!).
> 
> ----------------------------------------------------------------
> Boqun Feng (2):
>       rcu: exp: Fix "must hold exp_mutex" comments for QS reporting functions
>       rcu: exp: Protect all sync_rcu_preempt_exp_done() with rcu_node lock
> 
> Byungchul Park (3):
>       rcu: Inline rcu_preempt_do_callback() into its sole caller
>       rcu: Call wake_nocb_leader_defer() with 'FORCE' when nocb_q_count is high
>       rcu: Remove deprecated RCU debugfs tracing code
> 
> Nitzan Carmi (1):
>       nvme: Avoid flush dependency in delete controller flow
> 
> Paul E. McKenney (36):
>       rcu: Parallelize expedited grace-period initialization
>       rcu: Don't allocate rcu_nocb_mask if no one needs it
>       rcu: Rename cond_resched_rcu_qs() to cond_resched_tasks_rcu_qs()
>       softirq: Eliminate unused cond_resched_softirq() macro
>       rcu: Move __rcu_read_lock() and __rcu_read_unlock() to tree_plugin.h
>       rcu: Update rcu_bind_gp_kthread() header comment
>       srcu: Add cleanup_srcu_struct_quiesced()
>       rcu: Add leaf-node macros
>       rcu: Improve non-root rcu_cbs_completed() accuracy
>       rcu: Make rcu_start_future_gp()'s grace-period check more precise
>       rcu: Add accessor macros for the ->need_future_gp[] array
>       rcu: Make rcu_gp_kthread() check for early-boot activity
>       rcu: Make rcu_gp_cleanup() more accurately predict need for new GP
>       rcu: Avoid losing ->need_future_gp[] values due to GP start/end races
>       rcu: Make rcu_future_needs_gp() check all ->need_future_gps[] elements
>       rcu: Convert ->need_future_gp[] array to boolean
>       rcu: Make rcu_migrate_callbacks wake GP kthread when needed
>       rcu: Avoid __call_rcu_core() root rcu_node ->lock acquisition
>       rcu: Switch __rcu_process_callbacks() to rcu_accelerate_cbs()
>       rcu: Cleanup, don't put ->completed into an int
>       rcu: Clear request other than RCU_GP_FLAG_INIT at GP end
>       rcu: Inline rcu_start_gp_advanced() into rcu_start_future_gp()
>       rcu: Make rcu_start_future_gp() caller select grace period
>       rcu: Add funnel locking to rcu_start_this_gp()
>       rcu: Make rcu_start_this_gp() check for out-of-range requests
>       rcu: The rcu_gp_cleanup() function does not need cpu_needs_another_gp()
>       rcu: Simplify and inline cpu_needs_another_gp()
>       rcu: Drop early GP request check from rcu_gp_kthread()
>       rcu: Update list of rcu_future_grace_period() trace events
>       torture: Add a script to edit output from failed runs
>       torture: Fold parse-torture.sh into parse-console.sh
>       rcutorture: Print end-of-test state
>       rcutorture: Print end-of-test state in kvm.sh summary
>       rcutorture: Abbreviate kvm.sh summary lines
>       torture: Make kvm-find-errors.sh find build warnings
>       Merge branches 'exp.2018.05.15a', 'fixes.2018.05.15a', 'lock.2018.05.15a' and 'torture.2018.05.15a' into HEAD
> 
> Paul Gortmaker (1):
>       doc: Ensure whatisRCU.txt actually says what RCU is
> 
> Yury Norov (1):
>       rcu: Declare rcu_eqs_special_set() in public header
> 
>  Documentation/RCU/whatisRCU.txt                    |   2 +
>  drivers/nvme/host/core.c                           |   2 +-
>  include/linux/rcupdate.h                           |   4 +-
>  include/linux/rcutree.h                            |   1 +
>  include/linux/sched.h                              |   8 -
>  include/linux/srcu.h                               |  36 ++-
>  include/trace/events/rcu.h                         |  13 +-
>  kernel/rcu/rcu.h                                   |  12 +-
>  kernel/rcu/rcu_segcblist.c                         |  18 --
>  kernel/rcu/rcu_segcblist.h                         |   2 -
>  kernel/rcu/rcuperf.c                               |   2 +-
>  kernel/rcu/rcutorture.c                            |  15 +-
>  kernel/rcu/srcutiny.c                              |   9 +-
>  kernel/rcu/srcutree.c                              |  30 +-
>  kernel/rcu/tree.c                                  | 355 ++++++++-------------
>  kernel/rcu/tree.h                                  |  36 ++-
>  kernel/rcu/tree_exp.h                              | 235 ++++++++------
>  kernel/rcu/tree_plugin.h                           |  98 +++---
>  kernel/rcu/update.c                                |  50 +--
>  kernel/sched/core.c                                |  14 -
>  kernel/softirq.c                                   |   3 +-
>  kernel/torture.c                                   |   2 +-
>  kernel/trace/trace_benchmark.c                     |   4 +-
>  .../selftests/rcutorture/bin/kvm-find-errors.sh    |  56 ++++
>  .../selftests/rcutorture/bin/kvm-recheck-rcu.sh    |  12 +-
>  .../selftests/rcutorture/bin/kvm-recheck.sh        |   4 -
>  .../selftests/rcutorture/bin/kvm-test-1-run.sh     |   1 -
>  .../selftests/rcutorture/bin/parse-console.sh      | 115 ++++++-
>  .../selftests/rcutorture/bin/parse-torture.sh      | 105 ------
>  29 files changed, 616 insertions(+), 628 deletions(-)
>  create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-find-errors.sh
>  delete mode 100755 tools/testing/selftests/rcutorture/bin/parse-torture.sh

Pulled, thanks a lot Paul!

	Ingo