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Date: Mon, 10 Jan 2022 10:35:29 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: torvalds@...ux-foundation.org
Cc: mingo@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
rcu@...r.kernel.org, kernel-team@...com
Subject: [GIT PULL] RCU changes for v5.17
Hello, Linus,
Please pull the latest RCU git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/rcu.2022.01.09a
# HEAD: f80fe66c38d561a006fb4f514b0ee5d11cbe2673 Merge branches 'doc.2021.11.30c', 'exp.2021.12.07a', 'fastnohz.2021.11.30c', 'fixes.2021.11.30c', 'nocb.2021.12.09a', 'nolibc.2021.11.30c', 'tasks.2021.12.09a', 'torture.2021.12.07a' and 'torturescript.2021.11.30c' into HEAD
RCU changes for this cycle were:
doc.2021.11.30c: Documentation updates, perhaps most notably Neil Brown's
writeup of the reference-counting analogy to RCU.
exp.2021.12.07a: Expedited grace-period cleanups.
fastnohz.2021.11.30c: Remove CONFIG_RCU_FAST_NO_HZ due to lack of valid
users. I have asked around, posted a blog entry, and sent this
series to LKML without result.
fixes.2021.11.30c: Miscellaneous fixes.
nocb.2021.12.09a: RCU callback offloading updates, perhaps most notably
Frederic Weisbecker's updates allowing CPUs booted in the
de-offloaded state to be offloaded at runtime.
nolibc.2021.11.30c: nolibc fixes from Willy Tarreau and Anmar Faizi, but
also including Mark Brown's addition of gettid().
tasks.2021.12.09a: RCU Tasks Trace fixes, including changes that increase
the scalability of call_rcu_tasks_trace() for the BPF folks
(Martin Lau and KP Singh).
torture.2021.12.07a: Various fixes including those from Wander Lairson
Costa and Li Zhijian.
torturescript.2021.11.30c: Fixes plus addition of tests for the increased
call_rcu_tasks_trace() scalability.
----------------------------------------------------------------
Akira Yokosawa (1):
doc: RCU: Avoid 'Symbol' font-family in SVG figures
Ammar Faizi (3):
tools/nolibc: x86-64: Fix startup code bug
tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list
tools/nolibc: x86-64: Use `mov $60,%eax` instead of `mov $60,%rax`
Changbin Du (1):
rcu: in_irq() cleanup
Chun-Hung Tseng (1):
rcu: Replace ________p1 and _________p1 with __UNIQUE_ID(rcu)
Frederic Weisbecker (20):
rcu: Ignore rdp.cpu_no_qs.b.exp on preemptible RCU's rcu_qs()
rcu: Move rcu_data.cpu_no_qs.b.exp reset to rcu_export_exp_rdp()
rcu: Remove rcu_data.exp_deferred_qs and convert to rcu_data.cpu no_qs.b.exp
rcu/exp: Mark current CPU as exp-QS in IPI loop second pass
rcu/nocb: Make local rcu_nocb_lock_irqsave() safe against concurrent deoffloading
rcu/nocb: Prepare state machine for a new step
rcu/nocb: Invoke rcu_core() at the start of deoffloading
rcu/nocb: Make rcu_core() callbacks acceleration (de-)offloading safe
rcu/nocb: Check a stable offloaded state to manipulate qlen_last_fqs_check
rcu/nocb: Use appropriate rcu_nocb_lock_irqsave()
rcu/nocb: Limit number of softirq callbacks only on softirq
rcu: Fix callbacks processing time limit retaining cond_resched()
rcu: Apply callbacks processing time limit only on softirq
rcu/nocb: Don't invoke local rcu core on callback overload from nocb kthread
rcu/nocb: Remove rcu_node structure from nocb list when de-offloaded
rcu/nocb: Prepare nocb_cb_wait() to start with a non-offloaded rdp
rcu/nocb: Optimize kthreads and rdp initialization
rcu/nocb: Create kthreads on all CPUs if "rcu_nocbs=" or "nohz_full=" are passed
rcu/nocb: Allow empty "rcu_nocbs" kernel parameter
rcu/nocb: Merge rcu_spawn_cpu_nocb_kthread() and rcu_spawn_one_nocb_kthread()
Jun Miao (1):
rcu: Avoid alloc_pages() when recording stack
Li Zhijian (9):
refscale: Simplify the errexit checkpoint
refscale: Prevent buffer to pr_alert() being too long
refscale: Always log the error message
refscale: Add missing '\n' to flush message
scftorture: Add missing '\n' to flush message
scftorture: Remove unused SCFTORTOUT
rcuscale: Always log error message
scftorture: Always log error message
locktorture,rcutorture,torture: Always log error message
Mark Brown (1):
tools/nolibc: Implement gettid()
Neeraj Upadhyay (1):
rcu-tasks: Inspect stalled task's trc state in locked state
NeilBrown (1):
doc: Add refcount analogy to What is RCU
Paul E. McKenney (43):
rcutorture: Add CONFIG_PREEMPT_DYNAMIC=n to tiny scenarios
doc: Remove obsolete kernel-per-CPU-kthreads RCU_FAST_NO_HZ advice
torture: Remove RCU_FAST_NO_HZ from rcuscale and refscale scenarios
torture: Remove RCU_FAST_NO_HZ from rcu scenarios
rcu: Remove the RCU_FAST_NO_HZ Kconfig option
rcu: Move rcu_needs_cpu() to tree.c
srcu: Prevent redundant __srcu_read_unlock() wakeup
rcu-tasks: Don't remove tasks with pending IPIs from holdout list
rcutorture: Sanitize RCUTORTURE_RDR_MASK
rcutorture: More thoroughly test nested readers
rcutorture: Suppress pi-lock-across read-unlock testing for Tiny SRCU
torture: Catch kvm.sh help text up with actual options
torture: Make kvm-find-errors.sh report link-time undefined symbols
torture: Retry download once before giving up
rcutorture: Cause TREE02 and TREE10 scenarios to do more callback flooding
rcutorture: Test RCU Tasks lock-contention detection
torture: Fix incorrectly redirected "exit" in kvm-remote.sh
torture: Properly redirect kvm-remote.sh "echo" commands
rcu: Mark sync_sched_exp_online_cleanup() ->cpu_no_qs.b.exp load
rcu: Prevent expedited GP from enabling tick on offline CPU
rcu: Make idle entry report expedited quiescent states
rcu: Tighten rcu_advance_cbs_nowake() checks
rcu-tasks: Create per-CPU callback lists
rcu-tasks: Introduce ->percpu_enqueue_shift for dynamic queue selection
rcu-tasks: Convert grace-period counter to grace-period sequence number
rcu_tasks: Convert bespoke callback list to rcu_segcblist structure
rcutorture: Test RCU-tasks multiqueue callback queueing
rcutorture: Enable multiple concurrent callback-flood kthreads
rcutorture: Add ability to limit callback-flood intensity
rcutorture: Combine n_max_cbs from all kthreads in a callback flood
rcu-tasks: Use spin_lock_rcu_node() and friends
rcu-tasks: Add a ->percpu_enqueue_lim to the rcu_tasks structure
rcu-tasks: Abstract checking of callback lists
rcu-tasks: Abstract invocations of callbacks
rcu-tasks: Use workqueues for multiple rcu_tasks_invoke_cbs() invocations
rcu-tasks: Make rcu_barrier_tasks*() handle multiple callback queues
rcu-tasks: Add rcupdate.rcu_task_enqueue_lim to set initial queueing
rcu-tasks: Count trylocks to estimate call_rcu_tasks() contention
rcu-tasks: Avoid raw-spinlocked wakeups from call_rcu_tasks_generic()
rcu-tasks: Use more callback queues if contention encountered
rcu-tasks: Use separate ->percpu_dequeue_lim for callback dequeueing
rcu-tasks: Use fewer callbacks queues if callback flood ends
Merge branches 'doc.2021.11.30c', 'exp.2021.12.07a', 'fastnohz.2021.11.30c', 'fixes.2021.11.30c', 'nocb.2021.12.09a', 'nolibc.2021.11.30c', 'tasks.2021.12.09a', 'torture.2021.12.07a' and 'torturescript.2021.11.30c' into HEAD
Thomas Gleixner (1):
rcu/nocb: Make rcu_core() callbacks acceleration preempt-safe
Wander Lairson Costa (1):
rcutorture: Avoid soft lockup during cpu stall
Willy Tarreau (2):
tools/nolibc: i386: fix initial stack alignment
tools/nolibc: fix incorrect truncation of exit code
Zhouyi Zhou (1):
rcu: Improve tree_plugin.h comments and add code cleanups
Zqiang (1):
rcu: Avoid running boost kthreads on isolated CPUs
.../RCU/Design/Expedited-Grace-Periods/Funnel0.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel1.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel2.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel3.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel4.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel5.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel6.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel7.svg | 4 +-
.../RCU/Design/Expedited-Grace-Periods/Funnel8.svg | 4 +-
.../Design/Requirements/GPpartitionReaders1.svg | 36 +-
.../Design/Requirements/ReadersPartitionGP1.svg | 62 +--
Documentation/RCU/stallwarn.rst | 11 -
Documentation/RCU/whatisRCU.rst | 90 +++-
Documentation/admin-guide/kernel-parameters.txt | 70 ++-
.../admin-guide/kernel-per-CPU-kthreads.rst | 2 +-
Documentation/timers/no_hz.rst | 10 +-
include/linux/rcu_segcblist.h | 51 ++-
include/linux/rcupdate.h | 50 ++-
include/linux/rcutiny.h | 2 +-
include/linux/srcu.h | 3 +-
include/linux/torture.h | 9 +-
kernel/locking/locktorture.c | 4 +-
kernel/rcu/Kconfig | 20 +-
kernel/rcu/rcu_segcblist.c | 10 +-
kernel/rcu/rcu_segcblist.h | 12 +-
kernel/rcu/rcuscale.c | 14 +-
kernel/rcu/rcutorture.c | 234 +++++++---
kernel/rcu/refscale.c | 50 ++-
kernel/rcu/srcutiny.c | 2 +-
kernel/rcu/tasks.h | 476 +++++++++++++++++----
kernel/rcu/tree.c | 131 ++++--
kernel/rcu/tree.h | 31 +-
kernel/rcu/tree_exp.h | 14 +-
kernel/rcu/tree_nocb.h | 160 ++++---
kernel/rcu/tree_plugin.h | 250 ++---------
kernel/rcu/tree_stall.h | 27 +-
kernel/scftorture.c | 16 +-
kernel/torture.c | 4 +-
tools/include/nolibc/nolibc.h | 86 ++--
.../selftests/rcutorture/bin/kvm-find-errors.sh | 4 +-
.../selftests/rcutorture/bin/kvm-recheck-rcu.sh | 2 +-
.../testing/selftests/rcutorture/bin/kvm-remote.sh | 23 +-
tools/testing/selftests/rcutorture/bin/kvm.sh | 9 +-
.../selftests/rcutorture/bin/parse-build.sh | 3 +-
.../selftests/rcutorture/configs/rcu/SRCU-T | 1 +
.../selftests/rcutorture/configs/rcu/SRCU-U | 1 +
.../selftests/rcutorture/configs/rcu/TASKS01.boot | 1 +
.../selftests/rcutorture/configs/rcu/TINY01 | 1 +
.../selftests/rcutorture/configs/rcu/TINY02 | 1 +
.../selftests/rcutorture/configs/rcu/TRACE01.boot | 1 +
.../selftests/rcutorture/configs/rcu/TRACE02.boot | 1 +
.../selftests/rcutorture/configs/rcu/TREE01 | 1 -
.../selftests/rcutorture/configs/rcu/TREE02 | 1 -
.../selftests/rcutorture/configs/rcu/TREE02.boot | 1 +
.../selftests/rcutorture/configs/rcu/TREE04 | 1 -
.../selftests/rcutorture/configs/rcu/TREE05 | 1 -
.../selftests/rcutorture/configs/rcu/TREE06 | 1 -
.../selftests/rcutorture/configs/rcu/TREE07 | 1 -
.../selftests/rcutorture/configs/rcu/TREE08 | 1 -
.../selftests/rcutorture/configs/rcu/TREE10 | 1 -
.../selftests/rcutorture/configs/rcu/TREE10.boot | 1 +
.../selftests/rcutorture/configs/rcuscale/TINY | 2 +-
.../selftests/rcutorture/configs/rcuscale/TRACE01 | 1 -
.../selftests/rcutorture/configs/rcuscale/TREE | 1 -
.../selftests/rcutorture/configs/rcuscale/TREE54 | 1 -
.../rcutorture/configs/refscale/NOPREEMPT | 1 -
.../selftests/rcutorture/configs/refscale/PREEMPT | 1 -
.../selftests/rcutorture/doc/TREE_RCU-kconfig.txt | 1 -
68 files changed, 1244 insertions(+), 795 deletions(-)
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE02.boot
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE10.boot
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