On 12/8/20 5:07 AM, Peter Zijlstra wrote:
On Fri, Nov 20, 2020 at 11:14:16PM -0500, Waiman Long wrote:
@@ -1032,40 +901,16 @@ rwsem_down_read_slowpath(struct rw_semaphore *sem, int
state, long count)
*
* We can take the read lock directly without doing
*
On Fri, Nov 20, 2020 at 11:14:16PM -0500, Waiman Long wrote:
> @@ -1032,40 +901,16 @@ rwsem_down_read_slowpath(struct rw_semaphore *sem, int
> state, long count)
>*
>* We can take the read lock directly without doing
>* rwsem_optimistic_spin() if the conditions are
On Fri, 20 Nov 2020, Waiman Long wrote:
Reader optimistic spinning is helpful when the reader critical section
is short and there aren't that many readers around. It also improves
the chance that a reader can get the lock as writer optimistic spinning
disproportionally favors writers much more
Reader optimistic spinning is helpful when the reader critical section
is short and there aren't that many readers around. It also improves
the chance that a reader can get the lock as writer optimistic spinning
disproportionally favors writers much more than readers.
Since commit d3681e269fff
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