* Paul E. McKenney <paulmck@xxxxxxxxxxxxx> wrote: > Hello, Ingo, > > This pull request contain the following changes: > > 1. A few more RCU flavor consolidation cleanups. > > https://lore.kernel.org/lkml/20190801223132.GA14044@xxxxxxxxxxxxx > > 2. Miscellaneous fixes. > > https://lore.kernel.org/lkml/20190801223708.GA14862@xxxxxxxxxxxxx > > In addition, this includes a spelling fix in a comment and > an email-address change in MAINTAINERS: > > https://lore.kernel.org/lkml/1564386957-22833-1-git-send-email-mojha@xxxxxxxxxxxxxx > https://lore.kernel.org/lkml/20190805121517.4734-1-parri.andrea@xxxxxxxxx/ > > 3. Updates to RCU's list-traversal macros improving lockdep usability. > > https://lore.kernel.org/lkml/20190801224240.GA16092@xxxxxxxxxxxxx/ > > 4. Torture-test updates. > > Fat fingered. :-/ Please let me know if you would prefer that > I resend, then redo this full pull request next week. > > 5. Forward-progress improvements for no-CBs CPUs: Avoid ignoring > incoming callbacks during grace-period waits. > > https://lore.kernel.org/lkml/20190801225009.GA17155@xxxxxxxxxxxxx/ > > 6. Forward-progress improvements for no-CBs CPUs: Use ->cblist > structure to take advantage of others' grace periods. > > https://lore.kernel.org/lkml/20190801230744.GA19115@xxxxxxxxxxxxx/ > > Also added a small commit that avoids needlessly inflicting > scheduler-clock ticks on callback-offloaded CPUs. > > 7. Forward-progress improvements for no-CBs CPUs: Reduce contention > on ->nocb_lock guarding ->cblist. > > https://lore.kernel.org/lkml/20190801231619.GA22610@xxxxxxxxxxxxx/ > > 8. Forward-progress improvements for no-CBs CPUs: Add ->nocb_bypass > list to further reduce contention on ->nocb_lock guarding ->cblist. > > https://lore.kernel.org/lkml/20190802151435.GA1081@xxxxxxxxxxxxx/ > > (But only patches 1-10, as patch 10 proved to be quite valuable, > but patches 11-14 need more work and testing time.) > > 9. LKMM updates. > > https://lore.kernel.org/lkml/20190801222026.GA11315@xxxxxxxxxxxxx/ > > (But only patches 1-3, as the remainder are either new or are > related to ongoing work to verify LKMM against hardware memory > models.) > > Please note that this series encountered a merge conflict in -next: > > https://lore.kernel.org/lkml/20190813155048.59dd9bdf@xxxxxxxxxxxxxxxx/ > > Stephen's resolution looks good to me. > > All of these changes have been subjected to 0day Test Robot and -next > testing, and are available in the Git repository at: > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git for-mingo > > for you to fetch changes up to 07f038a408fb215fd656de78304b6ff4c7e4e490: > > Merge LKMM and RCU commits (2019-08-13 14:41:48 -0700) > > These changes do increase the size of the kernel by about 700 lines, > mostly due to the no-CBs CPU forward-progress improvements. Given that > RCU forward progress has started to become an issue over the past year > or so, these changes do not appear to me to be in any way optional. > > ---------------------------------------------------------------- > Andrea Parri (2): > tools/memory-model: Update the informal documentation > MAINTAINERS: Update e-mail address for Andrea Parri > > Byungchul Park (1): > rcu: Change return type of rcu_spawn_one_boost_kthread() > > Denis Efremov (1): > torture: Remove exporting of internal functions > > Eric Dumazet (1): > rcu: Allow rcu_do_batch() to dynamically adjust batch sizes > > Joel Fernandes (Google) (11): > rcu: Simplify rcu_note_context_switch exit from critical section > treewide: Rename rcu_dereference_raw_notrace() to _check() > rcu: Remove redundant debug_locks check in rcu_read_lock_sched_held() > rcuperf: Make rcuperf kernel test more robust for !expedited mode > tools/memory-model: Use cumul-fence instead of fence in ->prop example > rcu: Add support for consolidated-RCU reader checking > rcu/sync: Remove custom check for RCU readers > ipv4: Add lockdep condition to fix for_each_entry() > driver/core: Convert to use built-in RCU list checking > x86/pci: Pass lockdep condition to pcm_mmcfg_list iterator > acpi: Use built-in RCU list checking for acpi_ioremaps list > > Mukesh Ojha (1): > rcu: Fix spelling mistake "greate"->"great" > > Paul E. McKenney (67): > tools/memory-model: Make scripts be executable > rcu: Simplify rcu_read_unlock_special() deferred wakeups > rcu: Make rcu_read_unlock_special() checks match raise_softirq_irqoff() > lockdep: Make print_lock() address visible > time/tick-broadcast: Fix tick_broadcast_offline() lockdep complaint > rcu: Restore barrier() to rcu_read_lock() and rcu_read_unlock() > rcu: Add kernel parameter to dump trace after RCU CPU stall warning > rcu: Add destroy_work_on_stack() to match INIT_WORK_ONSTACK() > srcu: Avoid srcutorture security-based pointer obfuscation > doc: Add rcutree.kthread_prio pointer to stallwarn.txt > torture: Expand last_ts variable in kvm-test-1-run.sh > rcutorture: Test TREE03 with the threadirqs kernel boot parameter > rcutorture: Emulate userspace sojourn during call_rcu() floods > rcutorture: Aggressive forward-progress tests shouldn't block shutdown > rcu: Remove redundant "if" condition from rcu_gp_is_expedited() > arm: Use common outgoing-CPU-notification code > Merge branches 'consolidate.2019.08.01b', 'fixes.2019.08.12a', 'lists.2019.08.13a' and 'torture.2019.08.01b' into HEAD > rcu/nocb: Rename rcu_data fields to prepare for forward-progress work > rcu/nocb: Update comments to prepare for forward-progress work > rcu/nocb: Provide separate no-CBs grace-period kthreads > rcu/nocb: Rename nocb_follower_wait() to nocb_cb_wait() > rcu/nocb: Rename wake_nocb_leader() to wake_nocb_gp() > rcu/nocb: Rename __wake_nocb_leader() to __wake_nocb_gp() > rcu/nocb: Rename wake_nocb_leader_defer() to wake_nocb_gp_defer() > rcu/nocb: Rename rcu_organize_nocb_kthreads() local variable > rcu/nocb: Rename and document no-CB CB kthread sleep trace event > rcu/nocb: Rename rcu_nocb_leader_stride kernel boot parameter > rcu/nocb: Print gp/cb kthread hierarchy if dump_tree > rcu/nocb: Use separate flag to indicate disabled ->cblist > rcu/nocb: Use separate flag to indicate offloaded ->cblist > rcu/nocb: Add checks for offloaded callback processing > rcu/nocb: Make rcutree_migrate_callbacks() start at leaf rcu_node structure > rcu/nocb: Check for deferred nocb wakeups before nohz_full early exit > rcu/nocb: Remove deferred wakeup checks for extended quiescent states > rcu/nocb: Allow lockless use of rcu_segcblist_restempty() > rcu/nocb: Allow lockless use of rcu_segcblist_empty() > rcu/nocb: Leave ->cblist enabled for no-CBs CPUs > rcu/nocb: Use rcu_segcblist for no-CBs CPUs > rcu/nocb: Remove obsolete nocb_head and nocb_tail fields > rcu/nocb: Remove obsolete nocb_q_count and nocb_q_count_lazy fields > rcu/nocb: Remove obsolete nocb_cb_tail and nocb_cb_head fields > rcu/nocb: Remove obsolete nocb_gp_head and nocb_gp_tail fields > rcu/nocb: Use build-time no-CBs check in rcu_do_batch() > rcu/nocb: Use build-time no-CBs check in rcu_core() > rcu/nocb: Use build-time no-CBs check in rcu_pending() > rcu/nocb: Suppress uninitialized false-positive in nocb_gp_wait() > rcu/nohz: Turn off tick for offloaded CPUs > rcu/nocb: Enable re-awakening under high callback load > rcu/nocb: Never downgrade ->nocb_defer_wakeup in wake_nocb_gp_defer() > rcu/nocb: Make __call_rcu_nocb_wake() safe for many callbacks > rcu/nocb: Avoid needless wakeups of no-CBs grace-period kthread > rcu/nocb: Avoid ->nocb_lock capture by corresponding CPU > rcu/nocb: Round down for number of no-CBs grace-period kthreads > rcu/nocb: Reduce contention at no-CBs registry-time CB advancement > rcu/nocb: Reduce contention at no-CBs invocation-done time > rcu/nocb: Reduce ->nocb_lock contention with separate ->nocb_gp_lock > rcu/nocb: Unconditionally advance and wake for excessive CBs > rcu/nocb: Atomic ->len field in rcu_segcblist structure > rcu/nocb: Add bypass callback queueing > rcu/nocb: EXP Check use and usefulness of ->nocb_lock_contended > rcu/nocb: Print no-CBs diagnostics when rcutorture writer unduly delayed > rcu/nocb: Avoid synchronous wakeup in __call_rcu_nocb_wake() > rcu/nocb: Advance CBs after merge in rcutree_migrate_callbacks() > rcu/nocb: Reduce nocb_cb_wait() leaf rcu_node ->lock contention > rcu/nocb: Reduce __call_rcu_nocb_wake() leaf rcu_node ->lock contention > rcu/nocb: Don't wake no-CBs GP kthread if timer posted under overload > Merge LKMM and RCU commits > > Peter Zijlstra (1): > idle: Prevent late-arriving interrupts from disrupting offline > > Xiao Yang (1): > rcuperf: Fix perf_type module-parameter description > > .../RCU/Design/Requirements/Requirements.html | 73 +- > Documentation/RCU/stallwarn.txt | 6 + > Documentation/admin-guide/kernel-parameters.txt | 17 +- > MAINTAINERS | 2 +- > arch/arm/kernel/smp.c | 6 +- > arch/powerpc/include/asm/kvm_book3s_64.h | 2 +- > arch/x86/pci/mmconfig-shared.c | 5 +- > drivers/acpi/osl.c | 6 +- > drivers/base/base.h | 1 + > drivers/base/core.c | 12 + > drivers/base/power/runtime.c | 15 +- > include/linux/rcu_segcblist.h | 9 + > include/linux/rcu_sync.h | 4 +- > include/linux/rculist.h | 36 +- > include/linux/rcupdate.h | 9 +- > include/trace/events/rcu.h | 4 +- > kernel/locking/lockdep.c | 2 +- > kernel/rcu/Kconfig.debug | 11 + > kernel/rcu/rcu.h | 1 + > kernel/rcu/rcu_segcblist.c | 174 ++- > kernel/rcu/rcu_segcblist.h | 54 +- > kernel/rcu/rcuperf.c | 10 +- > kernel/rcu/rcutorture.c | 30 +- > kernel/rcu/srcutree.c | 5 +- > kernel/rcu/tree.c | 205 ++-- > kernel/rcu/tree.h | 81 +- > kernel/rcu/tree_exp.h | 8 +- > kernel/rcu/tree_plugin.h | 1195 ++++++++++++-------- > kernel/rcu/tree_stall.h | 9 + > kernel/rcu/update.c | 105 +- > kernel/sched/core.c | 57 +- > kernel/sched/idle.c | 5 +- > kernel/torture.c | 2 - > kernel/trace/ftrace_internal.h | 8 +- > kernel/trace/trace.c | 4 +- > net/ipv4/fib_frontend.c | 3 +- > tools/memory-model/Documentation/explanation.txt | 53 +- > tools/memory-model/README | 18 +- > tools/memory-model/scripts/checkghlitmus.sh | 0 > tools/memory-model/scripts/checklitmushist.sh | 0 > tools/memory-model/scripts/cmplitmushist.sh | 0 > tools/memory-model/scripts/initlitmushist.sh | 0 > tools/memory-model/scripts/judgelitmus.sh | 0 > tools/memory-model/scripts/newlitmushist.sh | 0 > tools/memory-model/scripts/parseargs.sh | 0 > tools/memory-model/scripts/runlitmushist.sh | 0 > .../selftests/rcutorture/bin/kvm-test-1-run.sh | 2 +- > .../selftests/rcutorture/configs/rcu/TREE03.boot | 1 + > 48 files changed, 1472 insertions(+), 778 deletions(-) > mode change 100644 => 100755 tools/memory-model/scripts/checkghlitmus.sh > mode change 100644 => 100755 tools/memory-model/scripts/checklitmushist.sh > mode change 100644 => 100755 tools/memory-model/scripts/cmplitmushist.sh > mode change 100644 => 100755 tools/memory-model/scripts/initlitmushist.sh > mode change 100644 => 100755 tools/memory-model/scripts/judgelitmus.sh > mode change 100644 => 100755 tools/memory-model/scripts/newlitmushist.sh > mode change 100644 => 100755 tools/memory-model/scripts/parseargs.sh > mode change 100644 => 100755 tools/memory-model/scripts/runlitmushist.sh Pulled into tip:core/rcu, thanks a lot Paul! The merge commit is a bit non-standard: 07f038a408fb: Merge LKMM and RCU commits but clear enough IMHO. Usually we try to keep this format: 6c06b66e957c: Merge branch 'X' into Y even for internal merge commits. Thanks, Ingo
