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    Subject[PATCH v3 0/5] lockinig/rwsem: Fix rwsem bugs & enable true lock handoff
    Date
    v3:
    - Make a minor cleanup to patch 1.
    - Add 3 more patches to implement true lock handoff.

    v2:
    - Add an additional patch to limit the # of first waiter optimistic
    spinning in the writer slowpath.

    It turns out the current waiter optimistic spinning code does not work
    that well if we have RT tasks in the mix. This patch series include two
    different fixes to resolve those issues. The last 3 patches modify the
    handoff code to implement true lock handoff similar to that of mutex.

    Waiman Long (5):
    locking/rwsem: Prevent non-first waiter from spinning in down_write()
    slowpath
    locking/rwsem: Limit # of null owner retries for handoff writer
    locking/rwsem: Change waiter->hanodff_set to a handoff_state enum
    locking/rwsem: Enable direct rwsem lock handoff
    locking/rwsem: Update handoff lock events tracking

    kernel/locking/lock_events_list.h | 6 +-
    kernel/locking/rwsem.c | 172 +++++++++++++++++++++++-------
    2 files changed, 138 insertions(+), 40 deletions(-)

    --
    2.31.1

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