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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 /drivers/acpi/processor_idle.c | |
parent | c2a24a7a036b3bd3a2e6c66730dfc777cae6540a (diff) | |
parent | 34bc7b454dc31f75a0be7ee8ab378135523d7c51 (diff) | |
download | linux-stable-7d9d077c783e33995c80d8b28fea1a98161934f4.tar.gz linux-stable-7d9d077c783e33995c80d8b28fea1a98161934f4.tar.bz2 linux-stable-7d9d077c783e33995c80d8b28fea1a98161934f4.zip |
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 'drivers/acpi/processor_idle.c')
-rw-r--r-- | drivers/acpi/processor_idle.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index 13200969ccf3..16a1663d02d4 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -23,6 +23,7 @@ #include <linux/minmax.h> #include <linux/perf_event.h> #include <acpi/processor.h> +#include <linux/context_tracking.h> /* * Include the apic definitions for x86 to have the APIC timer related defines @@ -647,11 +648,11 @@ static int __cpuidle acpi_idle_enter_bm(struct cpuidle_driver *drv, raw_spin_unlock(&c3_lock); } - rcu_idle_enter(); + ct_idle_enter(); acpi_idle_do_entry(cx); - rcu_idle_exit(); + ct_idle_exit(); /* Re-enable bus master arbitration */ if (dis_bm) { |