This is part 1 of a 3-part (0/1/2) series to rearchitect the internal operation of rwsem. This depends on the part 0 patches sent out previously
https://lore.kernel.org/lkml/[email protected] This part lays the foundation for part 2 without making any functional changes. This part includes the following changes: 1) Move code around and rename kernel/locking/rwsem.h to kernel/locking/rwsem-xadd.h as it will be specific to rwsem-xadd.c (patches 1-4). 2) Enhance the DEBUG_RWSEMS_WARN_ON() macro to provide more information and add additional checks (patches 5 & 6). 3) Make the core qspinlock_stat.h code generic (lock event counting) so that it can be used by all the architectures as well as other locking subsystems such as rwsem (patches 7-10). Lock event counting help us visualize how frequently a code path is being used as well as spotting abnormal behavior due to bugs in the code without noticeably affecting kernel performance and hence behavior. Both (2) and (3) are useful debugging aids. Waiman Long (10): locking/rwsem: Relocate rwsem_down_read_failed() locking/rwsem: Move owner setting code from rwsem.c to rwsem.h locking/rwsem: Rename kernel/locking/rwsem.h locking/rwsem: Move rwsem internal function declarations to rwsem-xadd.h locking/rwsem: Add debug check for __down_read*() locking/rwsem: Enhance DEBUG_RWSEMS_WARN_ON() macro locking/qspinlock_stat: Introduce a generic lockevent counting APIs locking/lock_events: Make lock_events available for all archs & other locks locking/lock_events: Don't show pvqspinlock events on bare metal locking/rwsem: Enable lock event counting arch/Kconfig | 10 ++ arch/x86/Kconfig | 8 - include/linux/rwsem.h | 7 - kernel/locking/Makefile | 1 + kernel/locking/lock_events.c | 179 ++++++++++++++++++++++ kernel/locking/lock_events.h | 55 +++++++ kernel/locking/lock_events_list.h | 67 ++++++++ kernel/locking/percpu-rwsem.c | 4 +- kernel/locking/qspinlock.c | 8 +- kernel/locking/qspinlock_paravirt.h | 19 +-- kernel/locking/qspinlock_stat.h | 242 ++++++----------------------- kernel/locking/rwsem-xadd.c | 192 ++++++++++++----------- kernel/locking/rwsem-xadd.h | 294 ++++++++++++++++++++++++++++++++++++ kernel/locking/rwsem.c | 32 ++-- kernel/locking/rwsem.h | 264 -------------------------------- 15 files changed, 778 insertions(+), 604 deletions(-) create mode 100644 kernel/locking/lock_events.c create mode 100644 kernel/locking/lock_events.h create mode 100644 kernel/locking/lock_events_list.h create mode 100644 kernel/locking/rwsem-xadd.h delete mode 100644 kernel/locking/rwsem.h -- 1.8.3.1
