Hello!
This v4 patch series re-implements RCU Tasks Trace in terms of SRCU-fast,
reducing the size of the Linux-kernel RCU implementation by several
hundred lines of code. The patches are as follows:
1. Re-implement RCU Tasks Trace in terms of SRCU-fast.
2. context_tracking: Remove
rcu_task_trace_heavyweight_{enter,exit}().
3. Clean up after the SRCU-fastification of RCU Tasks Trace.
4. Move rcu_tasks_trace_srcu_struct out of #ifdef
CONFIG_TASKS_RCU_GENERIC.
5. Add noinstr-fast rcu_read_{,un}lock_tasks_trace() APIs.
6. Update Requirements.rst for RCU Tasks Trace.
7. Deprecate rcu_read_{,un}lock_trace().
8. Create an rcu_tasks_trace_expedite_current() function.
9. Test rcu_tasks_trace_expedite_current().
Changes since v3:
o Rebase onto v6.19-rc1.
o Wait for arm64 per-CPU variable speedups to reach mainline.
https://lore.kernel.org/all/a1e505e4-931b-45cf-8ca7-337442aa598e@paulmck-laptop/#r
Changes since v2:
o SRCU improvments not strictly related to RCU tasks trace have
been moved out to a separate series.
o Use the new DEFINE_SRCU_FAST().
https://lore.kernel.org/all/7fa58961-2dce-4e08-8174-1d1cc592210f@paulmck-laptop/
Changes since v1:
o Consolidate RCU Tasks Trace cleanup patches per Alexei Starovoitov
feedback. This explains the decrease from 34 patches in v1 to
only 21 in this v2 series.
o While consolidating, consolidate the noinstr-fast patches and the
DEFINE_SRCU_FAST()/init_srcu_struct_fast() patches.
o Upgrade comments per Peter Zijlstra feedback.
o Extract Tiny SRCU bug fix into its own commit per Andrii Nakryiko
feedback.
o Switch srcu_expedite_current() from preempt_disable() to
migrate_disable() for PREEMPT_RT kernels per Zqiang feedback.
o Apply tags.
https://lore.kernel.org/all/580ea2de-799a-4ddc-bde9-c16f3fb1e6e7@paulmck-laptop/
Thanx, Paul
------------------------------------------------------------------------
b/Documentation/RCU/Design/Requirements/Requirements.rst | 12
b/Documentation/admin-guide/kernel-parameters.txt | 15
b/include/linux/rcupdate.h | 31
b/include/linux/rcupdate_trace.h | 107 +-
b/include/linux/sched.h | 1
b/init/init_task.c | 3
b/kernel/context_tracking.c | 20
b/kernel/fork.c | 3
b/kernel/rcu/Kconfig | 18
b/kernel/rcu/rcu.h | 9
b/kernel/rcu/rcuscale.c | 7
b/kernel/rcu/rcutorture.c | 2
b/kernel/rcu/tasks.h | 621 ---------------
b/scripts/checkpatch.pl | 4
b/tools/testing/selftests/rcutorture/configs/rcu/TRACE01 | 1
b/tools/testing/selftests/rcutorture/configs/rcu/TRACE02 | 1
include/linux/rcupdate_trace.h | 81 +
include/linux/sched.h | 5
kernel/rcu/Kconfig | 25
kernel/rcu/rcutorture.c | 1
kernel/rcu/tasks.h | 121 --
21 files changed, 219 insertions(+), 869 deletions(-)
