[0/8] zsmalloc: remove bit_spin_lock

Message

Minchan Kim Nov. 10, 2021, 6:54 p.m. UTC

The zsmalloc has used bit_spin_lock to minimize space overhead
since it's zpage granularity lock. However, it causes zsmalloc
non-working under PREEMPT_RT as well as adding too much
complication.

This patchset tries to replace the bit_spin_lock with per-pool
rwlock. It also removes unnecessary zspage isolation logic
from class, which was the other part too much complication
added into zsmalloc.
Last patch changes the get_cpu_var to local_lock to make it
work in PREEMPT_RT.

Minchan Kim (7):
  zsmalloc: introduce some helper functions
  zsmalloc: rename zs_stat_type to class_stat_type
  zsmalloc: decouple class actions from zspage works
  zsmalloc: introduce obj_allocated
  zsmalloc: move huge compressed obj from page to zspage
  zsmalloc: remove zspage isolation for migration
  zsmalloc: replace per zpage lock with pool->migrate_lock

Sebastian Andrzej Siewior (1):
  zsmalloc: replace get_cpu_var with local_lock

 mm/zsmalloc.c | 528 ++++++++++++++++++--------------------------------
 1 file changed, 188 insertions(+), 340 deletions(-)