Hello, Linus,
My level of resentment [1] towards these branches rose more quickly than
anticipated, so once the merge window opens please pull the latest RCU
git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/rcu.2022.03.13a
# HEAD: d5578190bed3d110203e3b6b29c5a7a39d51c6c0 Merge branches 'exp.2022.02.24a', 'fixes.2022.02.14a', 'rcu_barrier.2022.02.08a', 'rcu-tasks.2022.02.08a', 'rt.2022.02.01b', 'torture.2022.02.01b' and 'torturescript.2022.02.08a' into HEAD (2022-02-24 09:38:46 -0800)
RCU changes for this cycle were:
exp.2022.02.24a: Contains a fix for idle detection from Neeraj Upadhyay
and missing access marking detected by KCSAN.
fixes.2022.02.14a: Miscellaneous fixes.
rcu_barrier.2022.02.08a: Reduces coupling between rcu_barrier() and
CPU-hotplug operations, so that rcu_barrier() no longer needs
to do cpus_read_lock(). This may also someday allow system
boot to bring CPUs online concurrently.
rcu-tasks.2022.02.08a: Enable more aggressive movement to per-CPU
queueing when reacting to excessive lock contention due
to workloads placing heavy update-side stress on RCU tasks.
rt.2022.02.01b: Improvements to RCU priority boosting, including
changes from Neeraj Upadhyay, Zqiang, and Alison Chaiken.
torture.2022.02.01b: Various fixes improving test robustness and
debug information.
torturescript.2022.02.08a: Add tests for SRCU size transitions, further
compress torture.sh build products, and improve debug output.
There is a merge conflict between the following commits that was located
by -next testing:
6a2c1d450a6a3 ("rcu: Replace cpumask_weight with cpumask_empty where appropriate")
04d4e665a6090 ("sched/isolation: Use single feature type while referring to housekeeping cpumask")
Mark Brown (filling in for Stephen Rothwell) proposed a resolution [2]
that passes rcutorture testing. That resolution is also available in
the -rcu tree at branch merge.2022.03.15a.
[1] https://lore.kernel.org/all/CAHk-=wjEVLfoypyZHwdLjh3vX_BSJO1JJBjha2XgcghSX=sdgw@xxxxxxxxxxxxxx/
[2] https://lore.kernel.org/lkml/20220221181718.453295-1-broonie@xxxxxxxxxx/
----------------------------------------------------------------
Alison Chaiken (4):
rcu: Move kthread_prio bounds-check to a separate function
rcu: Make priority of grace-period thread consistent
rcu: Elevate priority of offloaded callback threads
rcu: Update documentation regarding kthread_prio cmdline parameter
David Woodhouse (2):
rcu: Kill rnp->ofl_seq and use only rcu_state.ofl_lock for exclusion
rcu: Add mutex for rcu boost kthread spawning and affinity setting
Ingo Molnar (2):
rcu: Uninline multi-use function: finish_rcuwait()
rcu: Remove __read_mostly annotations from rcu_scheduler_active externs
Neeraj Upadhyay (3):
rcu/exp: Fix check for idle context in rcu_exp_handler
rcu/nocb: Handle concurrent nocb kthreads creation
rcu: Remove unused rcu_state.boost
Paul E. McKenney (34):
rcu: Mark ->expmask access in synchronize_rcu_expedited_wait()
rcu: Mark accesses to boost_starttime
rcu: Don't deboost before reporting expedited quiescent state
rcutorture: Print message before invoking ->cb_barrier()
torture: Distinguish kthread stopping and being asked to stop
rcutorture: Increase visibility of forward-progress hangs
rcutorture: Make rcu_fwd_cb_nodelay be a counter
rcutorture: Add end-of-test check to rcu_torture_fwd_prog() loop
rcutorture: Fix rcu_fwd_mutex deadlock
torture: Wake up kthreads after storing task_struct pointer
rcutorture: Enable limited callback-flooding tests of SRCU
torture: Drop trailing ^M from console output
torture: Allow four-digit repetition numbers for --configs parameter
torture: Output per-failed-run summary lines from torture.sh
torture: Make kvm.sh summaries note runs having only KCSAN reports
torture: Indicate which torture.sh runs' bugs are all KCSAN reports
torture: Compress KCSAN as well as KASAN vmlinux files
torture: Make kvm-remote.sh try multiple times to download tarball
torture: Print only one summary line per run
torture: Make kvm-find-errors.sh notice missing vmlinux file
torture: Change KVM environment variable to RCUTORTURE
rcu: Refactor rcu_barrier() empty-list handling
rcu: Rework rcu_barrier() and callback-migration logic
rcu: Make rcu_barrier() no longer block CPU-hotplug operations
rcu: Create and use an rcu_rdp_cpu_online()
rcu-tasks: Use order_base_2() instead of ilog2()
rcu-tasks: Set ->percpu_enqueue_shift to zero upon contention
torture: Make torture.sh help message match reality
rcutorture: Test SRCU size transitions
rcutorture: Provide non-power-of-two Tasks RCU scenarios
MAINTAINERS: Add Frederic and Neeraj to their RCU files
rcu: Inline __call_rcu() into call_rcu()
rcu: Mark writes to the rcu_segcblist structure's ->flags field
Merge branches 'exp.2022.02.24a', 'fixes.2022.02.14a', 'rcu_barrier.2022.02.08a', 'rcu-tasks.2022.02.08a', 'rt.2022.02.01b', 'torture.2022.02.01b' and 'torturescript.2022.02.08a' into HEAD
Uladzislau Rezki (Sony) (1):
rcu: Fix description of kvfree_rcu()
Yury Norov (1):
rcu: Replace cpumask_weight with cpumask_empty where appropriate
Zqiang (3):
rcu: Create per-cpu rcuc kthreads only when rcutree.use_softirq=0
rcu: Add per-CPU rcuc task dumps to RCU CPU stall warnings
kasan: Record work creation stack trace with interrupts enabled
Documentation/admin-guide/kernel-parameters.txt | 2 +
MAINTAINERS | 2 +
include/linux/rcupdate.h | 4 +-
include/linux/rcutree.h | 2 +-
include/linux/rcuwait.h | 6 +-
include/trace/events/rcu.h | 9 +-
kernel/rcu/rcu_segcblist.h | 4 +-
kernel/rcu/rcutorture.c | 41 ++-
kernel/rcu/tasks.h | 6 +-
kernel/rcu/tree.c | 328 ++++++++++++---------
kernel/rcu/tree.h | 18 +-
kernel/rcu/tree_exp.h | 5 +-
kernel/rcu/tree_nocb.h | 18 +-
kernel/rcu/tree_plugin.h | 31 +-
kernel/rcu/tree_stall.h | 35 +++
kernel/rcu/update.c | 7 +
kernel/torture.c | 6 +-
.../selftests/rcutorture/bin/console-badness.sh | 2 +-
.../testing/selftests/rcutorture/bin/kvm-again.sh | 4 +-
.../selftests/rcutorture/bin/kvm-check-branches.sh | 4 +-
.../selftests/rcutorture/bin/kvm-end-run-stats.sh | 4 +-
.../selftests/rcutorture/bin/kvm-find-errors.sh | 6 +
.../selftests/rcutorture/bin/kvm-recheck-rcu.sh | 2 +-
.../testing/selftests/rcutorture/bin/kvm-remote.sh | 25 +-
tools/testing/selftests/rcutorture/bin/kvm.sh | 16 +-
.../selftests/rcutorture/bin/parse-console.sh | 10 +
tools/testing/selftests/rcutorture/bin/torture.sh | 38 ++-
.../selftests/rcutorture/configs/rcu/RUDE01 | 2 +-
.../selftests/rcutorture/configs/rcu/SRCU-N.boot | 1 +
.../selftests/rcutorture/configs/rcu/SRCU-P.boot | 2 +
.../selftests/rcutorture/configs/rcu/TRACE01 | 2 +-
31 files changed, 400 insertions(+), 242 deletions(-)
