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Message-ID: <20210704175841.GA2972019@paulmck-ThinkPad-P17-Gen-1>
Date: Sun, 4 Jul 2021 10:58:41 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: torvalds@...ux-foundation.org
Cc: mingo@...nel.org, linux-kernel@...r.kernel.org, tglx@...utronix.de,
akpm@...ux-foundation.org, peterz@...radead.org, vbabka@...e.cz
Subject: Re: [GIT PULL] RCU changes for v5.14
On Sun, Jul 04, 2021 at 10:24:40AM -0700, Paul E. McKenney wrote:
> Hello, Linus,
>
> In a deviation from long-standing -tip tradition, please pull the latest
> RCU git tree from:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git core-rcu-2021.07.04
> # HEAD: 641faf1b9064c270a476a424e60063bb05df3ee9: Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD (2021-05-18 10:56:19 -0700)
>
> RCU changes for this cycle were:
>
> o Bitmap support for "all" as an alias for all bits.
>
> o Documentation updates.
>
> o Miscellaneous fixes, including some that overlap into mm and lockdep.
>
> o kvfree_rcu() updates.
>
> o mem_dump_obj() updates, with acks from one of the slab-allocator
> maintainers.
>
> o RCU NOCB CPU updates, including limited deoffloading.
>
> o SRCU updates.
>
> o Tasks-RCU updates.
>
> o Torture-test updates.
>
> These changes have two merge conflicts with mainline. The first is
> a semantic conflict detected by -next between these two commits:
>
> 2f064a59a11f ("sched: Change task_struct::state")
> e44111ed20d8 ("rcu: Add ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output")
>
> An example merge resolution may be found here:
>
> 4e2b64e124c7 ("Merge remote-tracking branch 'linus/master' into HEAD")
>
> The second is a trivial whitespace conflict between these two commits:
>
> 76c8eaafe4f0 ("rcu: Create an unrcu_pointer() to remove __rcu from a pointer")
> b9964ce74544 ("rcu: Create an unrcu_pointer() to remove __rcu from a pointer")
>
> An example merge resolution may be found here, on top of the merge commit
> for the first conflict:
>
> f5f576accebd ("Example merge commit for RCU fixing whitespace conflict.")
Gah! Right merge, but wrong location. Pulling this will pull in
KCSAN and LKMM as well as RCU. Please accept my apologies, and
here is the correctly placed merge commit:
fa5035b6a215 ("Merge remote-tracking branch 'linus/master' into merge-example-rcu")
> And yes, this second conflict did in fact happen because I handed out
> a patch containing this whitespace error, and failed to follow up with
> the corrected patch. :-/
>
> Thanx, Paul
>
> ----------------------------------------------------------------
> Frederic Weisbecker (17):
> doc: Fix diagram references in memory-ordering document
> rcu/nocb: Use the rcuog CPU's ->nocb_timer
> timer: Revert "timer: Add timer_curr_running()"
> srcu: Remove superfluous sdp->srcu_lock_count zero filling
> srcu: Remove superfluous ssp initialization for early callbacks
> srcu: Unconditionally embed struct lockdep_map
> srcu: Initialize SRCU after timers
> srcu: Fix broken node geometry after early ssp init
> torture: Correctly fetch number of CPUs for non-English languages
> rcu/nocb: Directly call __wake_nocb_gp() from bypass timer
> rcu/nocb: Allow de-offloading rdp leader
> rcu/nocb: Cancel nocb_timer upon nocb_gp wakeup
> rcu/nocb: Delete bypass_timer upon nocb_gp wakeup
> rcu/nocb: Only cancel nocb timer if not polling
> rcu/nocb: Prepare for fine-grained deferred wakeup
> rcu/nocb: Unify timers
> srcu: Early test SRCU polling start
>
> Ingo Molnar (1):
> rcu: Fix various typos in comments
>
> Jules Irenge (1):
> rcu: Add missing __releases() annotation
>
> Maninder Singh (2):
> mm/slub: Fix backtrace of objects to handle redzone adjustment
> mm/slub: Add Support for free path information of an object
>
> Paul E. McKenney (47):
> doc: Fix statement of RCU's memory-ordering requirements
> tools/rcu: Add drgn script to dump number of RCU callbacks
> rcu-tasks: Add block comment laying out RCU Tasks design
> rcu-tasks: Add block comment laying out RCU Rude design
> torture: Fix remaining erroneous torture.sh instance of $*
> torture: Add "scenarios" option to kvm.sh --dryrun parameter
> torture: Make kvm-again.sh use "scenarios" rather than "batches" file
> refscale: Allow CPU hotplug to be enabled
> rcuscale: Allow CPU hotplug to be enabled
> torture: Add kvm-remote.sh script for distributed rcutorture test runs
> refscale: Add acqrel, lock, and lock-irq
> rcutorture: Abstract read-lock-held checks
> torture: Fix grace-period rate output
> torture: Abstract end-of-run summary
> torture: Make kvm.sh use abstracted kvm-end-run-stats.sh
> torture: Make the build machine control N in "make -jN"
> torture: Make kvm-find-errors.sh account for kvm-remote.sh
> rcutorture: Judge RCU priority boosting on grace periods, not callbacks
> torture: Set kvm.sh language to English
> rcutorture: Delay-based false positives for RCU priority boosting tests
> rcutorture: Consolidate rcu_torture_boost() timing and statistics
> rcutorture: Make rcu_torture_boost_failed() check for GP end
> rcutorture: Add BUSTED-BOOST to test RCU priority boosting tests
> rcutorture: Forgive RCU boost failures when CPUs don't pass through QS
> rcutorture: Don't count CPU-stalled time against priority boosting
> torture: Make kvm-remote.sh account for network failure in pathname checks
> torture: Don't cap remote runs by build-system number of CPUs
> rcutorture: Move mem_dump_obj() tests into separate function
> rcu: Remove the unused rcu_irq_exit_preempt() function
> rcu: Invoke rcu_spawn_core_kthreads() from rcu_spawn_gp_kthread()
> rcu: Add ->rt_priority and ->gp_start to show_rcu_gp_kthreads() output
> rcu: Add ->gp_max to show_rcu_gp_kthreads() output
> lockdep: Explicitly flag likely false-positive report
> rcu: Reject RCU_LOCKDEP_WARN() false positives
> rcu: Add quiescent states and boost states to show_rcu_gp_kthreads() output
> rcu: Make RCU priority boosting work on single-CPU rcu_node structures
> rcu: Make show_rcu_gp_kthreads() dump rcu_node structures blocking GP
> rcu: Restrict RCU_STRICT_GRACE_PERIOD to at most four CPUs
> rcu: Make rcu_gp_cleanup() be noinline for tracing
> rcu: Point to documentation of ordering guarantees
> rcu: Don't penalize priority boosting when there is nothing to boost
> rcu: Create an unrcu_pointer() to remove __rcu from a pointer
> rcu: Improve comments describing RCU read-side critical sections
> rcu: Remove obsolete rcu_read_unlock() deadlock commentary
> rcu-tasks: Make ksoftirqd provide RCU Tasks quiescent states
> tasks-rcu: Make show_rcu_tasks_gp_kthreads() be static inline
> Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD
>
> Rolf Eike Beer (1):
> rcu: Fix typo in comment: kthead -> kthread
>
> Uladzislau Rezki (Sony) (6):
> kvfree_rcu: Use [READ/WRITE]_ONCE() macros to access to nr_bkv_objs
> kvfree_rcu: Add a bulk-list check when a scheduler is run
> kvfree_rcu: Update "monitor_todo" once a batch is started
> kvfree_rcu: Use kfree_rcu_monitor() instead of open-coded variant
> kvfree_rcu: Fix comments according to current code
> kvfree_rcu: Refactor kfree_rcu_monitor()
>
> Yury Norov (2):
> bitmap_parse: Support 'all' semantics
> rcu/tree_plugin: Don't handle the case of 'all' CPU range
>
> Zhang Qiang (1):
> kvfree_rcu: Release a page cache under memory pressure
>
> Zhouyi Zhou (1):
> rcu: Improve tree.c comments and add code cleanups
>
> .../Memory-Ordering/Tree-RCU-Memory-Ordering.rst | 6 +-
> Documentation/admin-guide/kernel-parameters.rst | 5 +
> Documentation/admin-guide/kernel-parameters.txt | 5 +
> include/linux/rcupdate.h | 84 +++---
> include/linux/rcutiny.h | 1 -
> include/linux/rcutree.h | 1 -
> include/linux/srcu.h | 6 +
> include/linux/srcutree.h | 2 -
> include/linux/timer.h | 2 -
> include/trace/events/rcu.h | 1 +
> init/main.c | 2 +
> kernel/locking/lockdep.c | 6 +-
> kernel/rcu/Kconfig.debug | 2 +-
> kernel/rcu/rcu.h | 14 +-
> kernel/rcu/rcutorture.c | 315 +++++++++++----------
> kernel/rcu/refscale.c | 109 ++++++-
> kernel/rcu/srcutree.c | 28 +-
> kernel/rcu/sync.c | 4 +-
> kernel/rcu/tasks.h | 58 +++-
> kernel/rcu/tiny.c | 1 -
> kernel/rcu/tree.c | 313 +++++++++++---------
> kernel/rcu/tree.h | 14 +-
> kernel/rcu/tree_plugin.h | 239 ++++++++--------
> kernel/rcu/tree_stall.h | 84 +++++-
> kernel/rcu/update.c | 8 +-
> kernel/time/timer.c | 14 -
> lib/bitmap.c | 9 +
> lib/test_bitmap.c | 7 +
> mm/oom_kill.c | 2 +-
> mm/slab.h | 1 +
> mm/slab_common.c | 12 +-
> mm/slub.c | 8 +
> mm/util.c | 2 +-
> tools/rcu/rcu-cbs.py | 46 +++
> .../testing/selftests/rcutorture/bin/kvm-again.sh | 33 +--
> .../testing/selftests/rcutorture/bin/kvm-build.sh | 6 +-
> .../selftests/rcutorture/bin/kvm-end-run-stats.sh | 40 +++
> .../selftests/rcutorture/bin/kvm-find-errors.sh | 2 +-
> .../selftests/rcutorture/bin/kvm-recheck-rcu.sh | 2 +-
> .../testing/selftests/rcutorture/bin/kvm-remote.sh | 249 ++++++++++++++++
> tools/testing/selftests/rcutorture/bin/kvm.sh | 61 ++--
> tools/testing/selftests/rcutorture/bin/torture.sh | 2 +-
> .../selftests/rcutorture/configs/rcu/BUSTED-BOOST | 17 ++
> .../rcutorture/configs/rcu/BUSTED-BOOST.boot | 8 +
> .../selftests/rcutorture/configs/rcuscale/TREE | 2 +-
> .../selftests/rcutorture/configs/rcuscale/TREE54 | 2 +-
> .../rcutorture/configs/refscale/NOPREEMPT | 2 +-
> .../selftests/rcutorture/configs/refscale/PREEMPT | 2 +-
> .../rcutorture/formal/srcu-cbmc/src/locks.h | 2 +-
> 49 files changed, 1265 insertions(+), 576 deletions(-)
> create mode 100644 tools/rcu/rcu-cbs.py
> create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-end-run-stats.sh
> create mode 100755 tools/testing/selftests/rcutorture/bin/kvm-remote.sh
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/BUSTED-BOOST
> create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/BUSTED-BOOST.boot
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