[PATCH v3 0/2] mm: batch free swaps for zap_pte_range()

[Barry Song <21cnbao@gmail.com>]

From: Barry Song <v-songbaohua@oppo.com>

Batch free swap slots for zap_pte_range(), making munmap three times
faster when the page table entries are filled with swap entries to
be freed. This is likely another advantage of using mTHP.

-v3:
  * collect David's acked-by for patch1/2
  * further refine the code per David;
  * fix a corner case which might leak swap slots, thanks for Kairui's
    comment.
-v2:
  https://lore.kernel.org/all/20240807082508.358322-1-21cnbao@gmail.com/
  * cleanup the name of the instances of swap_info_struct, per
    Andrew, David;
  * refine the code to add fallback in the batch free function,
    Thanks for David's suggestion.
-v1:
  https://lore.kernel.org/all/20240806012409.61962-1-21cnbao@gmail.com/

Barry Song (2):
  mm: rename instances of swap_info_struct to meaningful 'si'
  mm: attempt to batch free swap entries for zap_pte_range()

 mm/swapfile.c | 410 ++++++++++++++++++++++++++++----------------------
 1 file changed, 232 insertions(+), 178 deletions(-)

-- 
2.34.1