[PATCH v4 00/14] Implement call_rcu_lazy() and miscellaneous fixes

[Joel Fernandes (Google)]

Refresh tested on real ChromeOS userspace and hardware, passes boot time tests
and rcuscale tests.

Fixes on top of v3:
- Fix boot issues due to a race in the lazy RCU logic which caused a missed
  wakeup of the RCU GP thread, causing synchronize_rcu() to stall.
- Fixed trace_rcu_callback tracepoint

I tested power previously [1], I am in the process of testing power again but I
wanted share my latest code as others who are testing power as well could use
the above fixes.

[1] https://lore.kernel.org/all/20220713213237.1596225-1-joel@xxxxxxxxxxxxxxxxx/

Joel Fernandes (Google) (13):
rcu: Introduce call_rcu_lazy() API implementation
rcuscale: Add laziness and kfree tests
fs: Move call_rcu() to call_rcu_lazy() in some paths
rcutorture: Add test code for call_rcu_lazy()
debug: Toggle lazy at runtime and change flush jiffies
cred: Move call_rcu() to call_rcu_lazy()
security: Move call_rcu() to call_rcu_lazy()
net/core: Move call_rcu() to call_rcu_lazy()
kernel: Move various core kernel usages to call_rcu_lazy()
lib: Move call_rcu() to call_rcu_lazy()
i915: Move call_rcu() to call_rcu_lazy()
fork: Move thread_stack_free_rcu to call_rcu_lazy
rcu/tree: Move trace_rcu_callback() before bypassing

Vineeth Pillai (1):
rcu: shrinker for lazy rcu

drivers/gpu/drm/i915/gem/i915_gem_object.c    |   2 +-
fs/dcache.c                                   |   4 +-
fs/eventpoll.c                                |   2 +-
fs/file_table.c                               |   2 +-
fs/inode.c                                    |   2 +-
include/linux/rcu_segcblist.h                 |   1 +
include/linux/rcupdate.h                      |   6 +
include/linux/sched/sysctl.h                  |   3 +
kernel/cred.c                                 |   2 +-
kernel/exit.c                                 |   2 +-
kernel/fork.c                                 |   6 +-
kernel/pid.c                                  |   2 +-
kernel/rcu/Kconfig                            |   8 +
kernel/rcu/rcu.h                              |  12 +
kernel/rcu/rcu_segcblist.c                    |  15 +-
kernel/rcu/rcu_segcblist.h                    |  20 +-
kernel/rcu/rcuscale.c                         |  74 ++++-
kernel/rcu/rcutorture.c                       |  60 +++-
kernel/rcu/tree.c                             | 139 ++++++----
kernel/rcu/tree.h                             |  10 +-
kernel/rcu/tree_nocb.h                        | 260 +++++++++++++++---
kernel/sysctl.c                               |  17 ++
kernel/time/posix-timers.c                    |   2 +-
lib/radix-tree.c                              |   2 +-
lib/xarray.c                                  |   2 +-
net/core/dst.c                                |   2 +-
security/security.c                           |   2 +-
security/selinux/avc.c                        |   4 +-
.../selftests/rcutorture/configs/rcu/CFLIST   |   1 +
.../selftests/rcutorture/configs/rcu/TREE11   |  18 ++
.../rcutorture/configs/rcu/TREE11.boot        |   8 +
31 files changed, 567 insertions(+), 123 deletions(-)
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE11
create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/TREE11.boot

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2.37.2.609.g9ff673ca1a-goog