[PATCH v2 00/16] Introduce kvfree_rcu(1 or 2 arguments)

[Uladzislau Rezki (Sony)]

This is a v2 of the https://lkml.org/lkml/2020/4/28/1626 series.
Please have look at v1 to find out more about motivation and details.
It is based on the latest dev.2020.05.17a Paul's branch.

Short changelog (v1 -> v2):
    - Combine some patches, thus reduce the overall number;
    - Switch one line comment type from "/* */" to "//";
    - Improve commit messages of some patches;
    - For tiny-RCU we just do synchronize_rcu() followed by kvfree()
      for single-argument of kvfree_rcu();
    - Drop the dynamic rcu_head attaching techniques + related patches;
    - Reduce duplication of code in some functions;
    - Added more comments for better understanding of code.

There is one patch related to "mm": "Rename kvfree_rcu() to local variant"
please note, it does not change any functionality, only renaming is done.

Joel Fernandes (Google) (3):
  rcu/tree: Keep kfree_rcu() awake during lock contention
  rcu/tree: Skip entry into the page allocator for PREEMPT_RT
  rcu/tree: Make debug_objects logic independent of rcu_head

Sebastian Andrzej Siewior (1):
  rcu/tree: Use static initializer for krc.lock

Uladzislau Rezki (Sony) (12):
  rcu/tree: Repeat the monitor if any free channel is busy
  rcu/tree: Simplify KFREE_BULK_MAX_ENTR macro
  rcu/tree: Move kfree_rcu_cpu locking/unlocking to separate functions
  rcu/tree: cache specified number of objects
  rcu/tree: Maintain separate array for vmalloc ptrs
  rcu/tiny: support vmalloc in tiny-RCU
  rcu: Rename *_kfree_callback/*_kfree_rcu_offset/kfree_call_*
  mm/list_lru.c: Rename kvfree_rcu() to local variant
  rcu: Introduce 2 arg kvfree_rcu() interface
  rcu: Support reclaim for head-less object
  rcu: Introduce single argument kvfree_rcu() interface
  lib/test_vmalloc.c: Add test cases for kvfree_rcu()

 .../admin-guide/kernel-parameters.txt         |   8 +
 include/linux/rcupdate.h                      |  53 ++-
 include/linux/rcutiny.h                       |  20 +-
 include/linux/rcutree.h                       |   2 +-
 include/trace/events/rcu.h                    |   8 +-
 kernel/rcu/tiny.c                             |   7 +-
 kernel/rcu/tree.c                             | 381 ++++++++++++------
 lib/test_vmalloc.c                            | 103 ++++-
 mm/list_lru.c                                 |   6 +-
 9 files changed, 446 insertions(+), 142 deletions(-)

-- 
2.20.1