* Yuanhan Liu <yuanhan....@linux.intel.com> wrote:
> [...]
Very nice measurements and analysis, thanks!
> As stated above, anybody can have a chance to own the lock in
> mutex once somebody release the lock. Well, there is only one
> to own the lock in rwsem write lock, and the one is known
> already: the one in the head of wait list. That would result
> to more contention in rwsem write lock case, especially if the
> one _will_ own the lock is not running now.
I think we should allow lock-steal between rwsem writers - that
will not hurt fairness as most rwsem fairness concerns relate to
reader vs. writer fairness.
Am I correct to assume that all relevant users in this workload
are down_write() users?
You can see the type of lock use in:
perf record -g
perf report
I bet that allowing rwsem writer lock-steal would improve other
workloads as well.
Thanks,
Ingo
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