Re: [PATCH tip/core/rcu 0/10] Expedited-grace-period changes for 4.5

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From	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH tip/core/rcu 0/10] Expedited-grace-period changes for 4.5
Date	Sun, 06 Dec 2015 03:30:01 +0100
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On Fri, Dec 04, 2015 at 05:06:42PM -0800, Josh Triplett wrote:
> On Fri, Dec 04, 2015 at 03:58:51PM -0800, Paul E. McKenney wrote:
> > Hello!
> > 
> > This series contains follow-on cleanup changes to RCU's expedited
> > grace-period functionality.  The patches in this series are as follows:
> > 
> > 1.	Short-circuit synchronize_sched_expedited() if there is only one CPU.
> > 
> > 2.	Update comment to clarify the role of ->expmaskinitnext.
> > 
> > 3.	Separate concerns by moving smp_mb() from rcu_seq_snap() to
> > 	rcu_exp_gp_seq_snap().
> > 
> > 4.	Safe a few lines of code by inverting the sense of
> > 	sync_rcu_exp_select_cpus() "if" statement.
> > 
> > 5.	Reduce expedited GP memory contention via per-CPU variables.
> > 
> > 6.	Get rid of (some) empty stall-warning messages by resolving
> > 	stall-warning ties.
> > 
> > 7.	Add more diagnostics to expedited stall warning messages.
> > 
> > 8.	Add rcu_normal kernel parameter to suppress expediting for
> > 	the benefit of aggressive real-time systems.
> > 
> > 9-10.	Allow expedited grace periods to be disabled just before init
> > 	is spawned, allowing them to speed up boot without interfering
> > 	with run-time real-time workloads.
> 
> This cover letter doesn't seem to match the patch series that shows up
> as replies to it.  The patch series has 13 patches, numbered 01/13 to
> 13/13.  You sent a separate cover letter, not part of this thread, that
> seems to match up.

Indeed, not one of my better patch submissions.  :-/

							Thanx, Paul

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[PATCH tip/core/rcu 0/10] Expedited-grace-period changes for 4.5 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:00 +0100
  [PATCH tip/core/rcu 09/13] rcu: Make cpu_needs_another_gp() be bool "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:10 +0100
  [PATCH tip/core/rcu 04/13] rcu: Remove lock-acquisition loop from rcu_read_unlock_special() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:10 +0100
  [PATCH tip/core/rcu 01/13] rcu: Move lock_class_key to local scope "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 02/13] kernel: Make rcu/tree_trace.c explicitly non-modular "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 03/13] rcu: Simplify rcu_sched_qs() control flow "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 06/13] rcu: Avoid tick_nohz_active checks on NOCBs CPUs "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 07/13] rcu: Stop disabling interrupts in scheduler fastpaths "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 05/13] rcu: Fix obsolete rcu_bootup_announce_oddness() comment "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 12/13] rcu: Move wakeup out from under rnp->lock "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 11/13] rcu: Fix comment for rcu_dereference_raw_notrace "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 13/13] rcu: Make rcu_gp_init() be bool rather than int "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 08/13] rcu: Eliminate unused rcu_init_one() argument "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  [PATCH tip/core/rcu 10/13] rcu: Don't redundantly disable irqs in rcu_irq_{enter,exit}() "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-05 01:20 +0100
  Re: [PATCH tip/core/rcu 0/10] Expedited-grace-period changes for 4.5 Josh Triplett <josh@joshtriplett.org> - 2015-12-05 02:10 +0100
    Re: [PATCH tip/core/rcu 0/10] Expedited-grace-period changes for 4.5 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2015-12-06 03:30 +0100

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