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Message-Id: <20180829222021.GA29944@linux.vnet.ibm.com>
Date: Wed, 29 Aug 2018 15:20:21 -0700
From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To: linux-kernel@...r.kernel.org
Cc: 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 0/19] RCU flavor-consolidation changes for
v4.20/v5.0
Hello!
This series contains the RCU flavor consolidation, along with some initial
cleanup work enabled by that consolidation (and some that became apparent
while cleaning up):
1. Refactor rcu_{nmi,irq}_{enter,exit}(), saving a branch on the
idle entry/exit hotpaths, courtesy of Byungchul Park,
2. Defer reporting RCU-preempt quiescent states when disabled.
This is the key commit that consolidates the RCU-bh and RCU-sched
flavors into RCU, however, the RCU-bh and RCU-sched flavors
still exist independently as well at this point.
3. Test extended "rcu" read-side critical sections. This commit
causes rcutorture to test RCU's new-found ability to act as
the combination of RCU, RCU-bh, and RCU-sched.
4. Allow processing deferred QSes for exiting RCU-preempt readers.
This is a optimization.
5. Remove now-unused ->b.exp_need_qs field from the rcu_special union.
6. Add warning to detect half-interrupts. Test the claim that
the Linux kernel no longer does half-interrupts.
7. Apply RCU-bh QSes to RCU-sched and RCU-preempt when safe, that is,
make the consolidated RCU inherit RCU-bh's denial-of-service
avoidance mechanism.
8. Report expedited grace periods at context-switch time. This is
an optimization enabled by the RCU flavor consolidation.
9. Define RCU-bh update API in terms of RCU. This commit gets rid
of the RCU-bh update mechanism.
10. Update comments and help text to account for the removal of
the RCU-bh update mechanism.
11. Drop "wake" parameter from rcu_report_exp_rdp().
12. Fix typo in rcu_get_gp_kthreads_prio() header comment.
13. Define RCU-sched API in terms of RCU for Tree RCU PREEMPT builds.
Although this commit gets rid of the RCU-sched update mechanism
from PREEMPT builds, it of course remains as the sole RCU flavor
for !PREEMPT && !SMP builds.
14. Express Tiny RCU updates in terms of RCU rather than RCU-sched.
This will enable additional cleanups and code savings.
15. Remove RCU_STATE_INITIALIZER() in favor of just using an open-coded
initializer for the sole remaining rcu_state structure.
16. Eliminate rcu_state structure's ->call field, as it is now always
just call_rcu().
17. Remove rcu_state structure's ->rda field, as there is now only one
set of per-CPU rcu_data structures.
Thanx, Paul
------------------------------------------------------------------------
Documentation/RCU/Design/Requirements/Requirements.html | 50 -
include/linux/rcupdate.h | 48 -
include/linux/rcupdate_wait.h | 6
include/linux/rcutiny.h | 61 +
include/linux/rcutree.h | 31
include/linux/sched.h | 6
kernel/rcu/Kconfig | 10
kernel/rcu/rcutorture.c | 1
kernel/rcu/tiny.c | 163 +--
kernel/rcu/tree.c | 655 +++++-----------
kernel/rcu/tree.h | 44 -
kernel/rcu/tree_exp.h | 256 +++---
kernel/rcu/tree_plugin.h | 523 ++++++------
kernel/rcu/update.c | 2
kernel/softirq.c | 3
15 files changed, 836 insertions(+), 1023 deletions(-)
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