[PATCH v4 0/4] Optimize the fast path of mas_store()

[Peng Zhang]

Add fast paths for mas_wr_append() and mas_wr_slot_store() respectively.
The newly added fast path of mas_wr_append() is used in fork() and how
much it benefits fork() depends on how many VMAs are duplicated.

Thanks Liam for the review.

Changes since v3:
 - Revise the commit log of [4/4]

v1: https://lore.kernel.org/lkml/20230602075353.5917-1-zhangpeng.00@xxxxxxxxxxxxx/
v2: https://lore.kernel.org/lkml/20230609120347.63936-1-zhangpeng.00@xxxxxxxxxxxxx/
v3: https://lore.kernel.org/lkml/20230615084301.97701-1-zhangpeng.00@xxxxxxxxxxxxx/

Peng Zhang (4):
  maple_tree: add test for mas_wr_modify() fast path
  maple_tree: add test for expanding range in RCU mode
  maple_tree: optimize mas_wr_append(), also improve duplicating VMAs
  maple_tree: add a fast path case in mas_wr_slot_store()

 lib/maple_tree.c                 | 69 +++++++++++++++++++----------
 lib/test_maple_tree.c            | 65 +++++++++++++++++++++++++++
 tools/testing/radix-tree/maple.c | 75 ++++++++++++++++++++++++++++++++
 3 files changed, 186 insertions(+), 23 deletions(-)

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2.20.1