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This pull request contains the following branches: 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. -----BEGIN PGP SIGNATURE----- iQJHBAABCgAxFiEEbK7UrM+RBIrCoViJnr8S83LZ+4wFAmHbtukTHHBhdWxtY2tA a2VybmVsLm9yZwAKCRCevxLzctn7jAX3D/4mrDqAPhAWLWKp7klRhvwypDxj0cxd /TuGNcZN+YdvNfwozcrog+8yiPxcxhNW1pMESi7SolAhRwuk1JEjiclY+7ORYd6a /dmJB/lQBezGAdgVabRaJjfLKikpQ+/EnzKee3jjTS1XhJRJe/hDwlVP2B6IROfy iko5yi+hxfhQdPW6UcpTPCl/4Jn63d9+2SIlW16H0LhzlJeYYsWz4tqOEKYeiHeB Zxq90InCVmb3YYJzOtk/G7pGQ2RxKPR6/ilm87yzAfJD0Dawd2pgYeDoGvzx94S6 CmhvA6GmwO3JOL6lH891AQVXskCODSJdosP/7otm9u36XJT+5lNOeLRsLbS0Sd9t BrJKfC7wBFuuIug8j5k3+QSXiKB7Q5JpXEhOjH4BIrkSL0Z0jSVsrZwCSbiUkjZZ CdF19bL+4h4x5ZL3pndsplX+9BDXsKEgGHWeuzzB4rmsUMtBg84HyfbPp8mLxm6B i7a1hNVQ5rFWYj6TpI1ZgOBIX07i21OyMAUbXn5JSWUmOyPp2V6D4Sp1zdlvRM0r hKkIg73NP6ah9QZQTp7T1rIjVmFc2KjbmNZQegjR2pHykPCChT6xnlFix4InV4Ma BDtigP6vhWz1YfKPjek5WESzHmMRoxdpFjqDY//Uj8/bKBccldO0osERKWtdDlDL bwMNjny3PPLRng== =K6AN -----END PGP SIGNATURE----- Merge tag 'rcu.2022.01.09a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu Pull RCU updates from Paul McKenney: - Documentation updates, perhaps most notably Neil Brown's writeup of the reference-counting analogy to RCU. - Expedited grace-period cleanups. - 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. - Miscellaneous fixes. - 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 fixes from Willy Tarreau and Anmar Faizi, but also including Mark Brown's addition of gettid(). - RCU Tasks Trace fixes, including changes that increase the scalability of call_rcu_tasks_trace() for the BPF folks (Martin Lau and KP Singh). - Various fixes including those from Wander Lairson Costa and Li Zhijian. - Fixes plus addition of tests for the increased call_rcu_tasks_trace() scalability. * tag 'rcu.2022.01.09a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (87 commits) rcu/nocb: Merge rcu_spawn_cpu_nocb_kthread() and rcu_spawn_one_nocb_kthread() rcu/nocb: Allow empty "rcu_nocbs" kernel parameter rcu/nocb: Create kthreads on all CPUs if "rcu_nocbs=" or "nohz_full=" are passed rcu/nocb: Optimize kthreads and rdp initialization rcu/nocb: Prepare nocb_cb_wait() to start with a non-offloaded rdp rcu/nocb: Remove rcu_node structure from nocb list when de-offloaded rcu-tasks: Use fewer callbacks queues if callback flood ends rcu-tasks: Use separate ->percpu_dequeue_lim for callback dequeueing rcu-tasks: Use more callback queues if contention encountered rcu-tasks: Avoid raw-spinlocked wakeups from call_rcu_tasks_generic() rcu-tasks: Count trylocks to estimate call_rcu_tasks() contention rcu-tasks: Add rcupdate.rcu_task_enqueue_lim to set initial queueing rcu-tasks: Make rcu_barrier_tasks*() handle multiple callback queues rcu-tasks: Use workqueues for multiple rcu_tasks_invoke_cbs() invocations rcu-tasks: Abstract invocations of callbacks rcu-tasks: Abstract checking of callback lists rcu-tasks: Add a ->percpu_enqueue_lim to the rcu_tasks structure rcu-tasks: Inspect stalled task's trc state in locked state rcu-tasks: Use spin_lock_rcu_node() and friends rcutorture: Combine n_max_cbs from all kthreads in a callback flood ... |
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