* Waiman Long <waiman.l...@hp.com> wrote:
> BTW, I have also been thinking about extracting the spinlock out from the
> mutex
> structure for some busy mutex by adding a pointer to an external auxiliary
> structure (separately allocated at init time). The idea is to use the
> external
> spinlock if available. Otherwise, the internal one will be used. That should
> reduce cacheline contention for some of the busiest mutex. The spinner
> queuing
> tickets can be in the external structure too. However, it requires a one line
> change in each of the mutex initialization code. I haven't actually made the
> code change and try it yet, but that is something that I am thinking of doing
> when I have time.
I'm not sure per mutex allocations are a really good idea - we like our locking
primitives to be simple, embeddable into data structures and allocatable
together
with the data structure with no other separate memory footprint.
Thanks,
Ingo
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