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author | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-02 19:12:45 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-08-02 19:12:45 -0700 |
commit | 7d9d077c783e33995c80d8b28fea1a98161934f4 (patch) | |
tree | 5404e84d237b764a07aaf299d175c1dcfbad9966 /init | |
parent | c2a24a7a036b3bd3a2e6c66730dfc777cae6540a (diff) | |
parent | 34bc7b454dc31f75a0be7ee8ab378135523d7c51 (diff) | |
download | linux-7d9d077c783e33995c80d8b28fea1a98161934f4.tar.gz |
Merge tag 'rcu.2022.07.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull RCU updates from Paul McKenney: - Documentation updates - Miscellaneous fixes - Callback-offload updates, perhaps most notably a new RCU_NOCB_CPU_DEFAULT_ALL Kconfig option that causes all CPUs to be offloaded at boot time, regardless of kernel boot parameters. This is useful to battery-powered systems such as ChromeOS and Android. In addition, a new RCU_NOCB_CPU_CB_BOOST kernel boot parameter prevents offloaded callbacks from interfering with real-time workloads and with energy-efficiency mechanisms - Polled grace-period updates, perhaps most notably making these APIs account for both normal and expedited grace periods - Tasks RCU updates, perhaps most notably reducing the CPU overhead of RCU tasks trace grace periods by more than a factor of two on a system with 15,000 tasks. The reduction is expected to increase with the number of tasks, so it seems reasonable to hypothesize that a system with 150,000 tasks might see a 20-fold reduction in CPU overhead - Torture-test updates - Updates that merge RCU's dyntick-idle tracking into context tracking, thus reducing the overhead of transitioning to kernel mode from either idle or nohz_full userspace execution for kernels that track context independently of RCU. This is expected to be helpful primarily for kernels built with CONFIG_NO_HZ_FULL=y * tag 'rcu.2022.07.26a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (98 commits) rcu: Add irqs-disabled indicator to expedited RCU CPU stall warnings rcu: Diagnose extended sync_rcu_do_polled_gp() loops rcu: Put panic_on_rcu_stall() after expedited RCU CPU stall warnings rcutorture: Test polled expedited grace-period primitives rcu: Add polled expedited grace-period primitives rcutorture: Verify that polled GP API sees synchronous grace periods rcu: Make Tiny RCU grace periods visible to polled APIs rcu: Make polled grace-period API account for expedited grace periods rcu: Switch polled grace-period APIs to ->gp_seq_polled rcu/nocb: Avoid polling when my_rdp->nocb_head_rdp list is empty rcu/nocb: Add option to opt rcuo kthreads out of RT priority rcu: Add nocb_cb_kthread check to rcu_is_callbacks_kthread() rcu/nocb: Add an option to offload all CPUs on boot rcu/nocb: Fix NOCB kthreads spawn failure with rcu_nocb_rdp_deoffload() direct call rcu/nocb: Invert rcu_state.barrier_mutex VS hotplug lock locking order rcu/nocb: Add/del rdp to iterate from rcuog itself rcu/tree: Add comment to describe GP-done condition in fqs loop rcu: Initialize first_gp_fqs at declaration in rcu_gp_fqs() rcu/kvfree: Remove useless monitor_todo flag rcu: Cleanup RCU urgency state for offline CPU ...
Diffstat (limited to 'init')
-rw-r--r-- | init/Kconfig | 4 | ||||
-rw-r--r-- | init/init_task.c | 1 |
2 files changed, 3 insertions, 2 deletions
diff --git a/init/Kconfig b/init/Kconfig index e70702d36180..7f75a61eb52e 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -494,11 +494,11 @@ config VIRT_CPU_ACCOUNTING_NATIVE config VIRT_CPU_ACCOUNTING_GEN bool "Full dynticks CPU time accounting" - depends on HAVE_CONTEXT_TRACKING + depends on HAVE_CONTEXT_TRACKING_USER depends on HAVE_VIRT_CPU_ACCOUNTING_GEN depends on GENERIC_CLOCKEVENTS select VIRT_CPU_ACCOUNTING - select CONTEXT_TRACKING + select CONTEXT_TRACKING_USER help Select this option to enable task and CPU time accounting on full dynticks systems. This accounting is implemented by watching every diff --git a/init/init_task.c b/init/init_task.c index 73cc8f03511a..ff6c4b9bfe6b 100644 --- a/init/init_task.c +++ b/init/init_task.c @@ -157,6 +157,7 @@ struct task_struct init_task .trc_reader_nesting = 0, .trc_reader_special.s = 0, .trc_holdout_list = LIST_HEAD_INIT(init_task.trc_holdout_list), + .trc_blkd_node = LIST_HEAD_INIT(init_task.trc_blkd_node), #endif #ifdef CONFIG_CPUSETS .mems_allowed_seq = SEQCNT_SPINLOCK_ZERO(init_task.mems_allowed_seq, |