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Merge tag 'rcu.release.v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux

Browse Source 
Pull RCU updates from Boqun Feng:

 - RCU Tasks Trace:

   Re-implement RCU tasks trace in term of SRCU-fast, not only more than
   500 lines of code are saved because of the reimplementation, a new
   set of API, rcu_read_{,un}lock_tasks_trace(), becomes possible as
   well. Compared to the previous rcu_read_{,un}lock_trace(), the new
   API avoid the task_struct accesses thanks to the SRCU-fast semantics.

   As a result, the old rcu_read{,un}lock_trace() API is now deprecated.

 - RCU Torture Test:
    - Multiple improvements on kvm-series.sh (parallel run and
      progress showing metrics)
    - Add context checks to rcu_torture_timer()
    - Make config2csv.sh properly handle comments in .boot files
    - Include commit discription in testid.txt

 - Miscellaneous RCU changes:
    - Reduce synchronize_rcu() latency by reporting GP kthread's
      CPU QS early
    - Use suitable gfp_flags for the init_srcu_struct_nodes()
    - Fix rcu_read_unlock() deadloop due to softirq
    - Correctly compute probability to invoke ->exp_current()
      in rcutorture
    - Make expedited RCU CPU stall warnings detect stall-end races

 - RCU nocb:
    - Remove unnecessary WakeOvfIsDeferred wake path and callback
      overload handling
    - Extract nocb_defer_wakeup_cancel() helper

* tag 'rcu.release.v7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux: (25 commits)
  rcu/nocb: Extract nocb_defer_wakeup_cancel() helper
  rcu/nocb: Remove dead callback overload handling
  rcu/nocb: Remove unnecessary WakeOvfIsDeferred wake path
  rcu: Reduce synchronize_rcu() latency by reporting GP kthread's CPU QS early
  srcu: Use suitable gfp_flags for the init_srcu_struct_nodes()
  rcu: Fix rcu_read_unlock() deadloop due to softirq
  rcutorture: Correctly compute probability to invoke ->exp_current()
  rcu: Make expedited RCU CPU stall warnings detect stall-end races
  rcutorture: Add --kill-previous option to terminate previous kvm.sh runs
  rcutorture: Prevent concurrent kvm.sh runs on same source tree
  torture: Include commit discription in testid.txt
  torture: Make config2csv.sh properly handle comments in .boot files
  torture: Make kvm-series.sh give run numbers and totals
  torture: Make kvm-series.sh give build numbers and totals
  torture: Parallelize kvm-series.sh guest-OS execution
  rcutorture: Add context checks to rcu_torture_timer()
  rcutorture: Test rcu_tasks_trace_expedite_current()
  srcu: Create an rcu_tasks_trace_expedite_current() function
  checkpatch: Deprecate rcu_read_{,un}lock_trace()
  rcu: Update Requirements.rst for RCU Tasks Trace
  ...
This commit is contained in:
Linus Torvalds
2026-02-09 09:46:26 -08:00
parent 5c40222af1 ed062c41df
commit ef852baaf6
27 changed files with 459 additions and 932 deletions
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15
Documentation/admin-guide/kernel-parameters.txt
View File

@@ -6289,13 +6289,6 @@ Kernel parameters
dynamically) adjusted. This parameter is intended
for use in testing.
rcupdate.rcu_task_ipi_delay= [KNL]
Set time in jiffies during which RCU tasks will
avoid sending IPIs, starting with the beginning
of a given grace period. Setting a large
number avoids disturbing real-time workloads,
but lengthens grace periods.
rcupdate.rcu_task_lazy_lim= [KNL]
Number of callbacks on a given CPU that will
cancel laziness on that CPU. Use -1 to disable
@@ -6339,14 +6332,6 @@ Kernel parameters
of zero will disable batching. Batching is
always disabled for synchronize_rcu_tasks().
rcupdate.rcu_tasks_trace_lazy_ms= [KNL]
Set timeout in milliseconds RCU Tasks
Trace asynchronous callback batching for
call_rcu_tasks_trace(). A negative value
will take the default. A value of zero will
disable batching. Batching is always disabled
for synchronize_rcu_tasks_trace().
rcupdate.rcu_self_test= [KNL]
Run the RCU early boot self tests