linux-kernel - [PATCH tip/core/rcu 0/11] No-CBs grace-period kthread updates for v5.3-rc2

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Message-ID: <20190801225009.GA17155@linux.ibm.com>
Date:   Thu, 1 Aug 2019 15:50:09 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org
Subject: [PATCH tip/core/rcu 0/11] No-CBs grace-period kthread updates for
 v5.3-rc2

Hello!

This series reduces memory footprint (RCU callbacks posted by no-CBs
CPUs) by providing separate rcuog kthreads that wait for grace periods,
thus avoiding the current situation in which callbacks are delayed while
the leader rcuo kthreads invokes callbacks:

1.	Rename rcu_data fields to prepare for forward-progress work.

2.	Update comments to prepare for forward-progress work.

3.	Provide separate no-CBs grace-period kthreads.

4.	Rename nocb_follower_wait() to nocb_cb_wait().

5.	Rename wake_nocb_leader() to wake_nocb_gp().

6.	Rename __wake_nocb_leader() to __wake_nocb_gp().

7.	Rename wake_nocb_leader_defer() to wake_nocb_gp_defer().

8.	Rename rcu_organize_nocb_kthreads() local variable.

9.	Rename and document no-CB CB kthread sleep trace event.

10.	Rename rcu_nocb_leader_stride kernel boot parameter.

11.	Print gp/cb kthread hierarchy if dump_tree.

							Thanx, Paul

------------------------------------------------------------------------

 Documentation/admin-guide/kernel-parameters.txt |   13 -
 include/trace/events/rcu.h                      |    3 
 kernel/rcu/tree.h                               |   28 +-
 kernel/rcu/tree_plugin.h                        |  312 ++++++++++++------------
 4 files changed, 183 insertions(+), 173 deletions(-)