Mitko Haralanov 67caea1fec
IB/hfi1: Improve performance of interval RB trees ...
The interval RB tree management functions use handlers to
store user-specific callback for the various tree operations.
These handlers are put on a doubly-linked list. When a RB
tree function is called, the list is searched for the handler
of the particular tree.
The list which holds the handlers is modified very rarely - when
a handler is created and when a handler is removed. On the other
hand, it is searched very often. This a perfect usage scenario
for RCU.
The result is a much lower overhead of traversing the list as most
of the time no locking will be required.
Reviewed-by: Dean Luick <dean.luick@intel.com >
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com >
Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com >
Signed-off-by: Doug Ledford <dledford@redhat.com >
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67caea1fec