On Wed, Apr 12, 2017 at 05:21:02PM -0700, Adrian Chadd wrote:
> It's the same pages, right?
Perhaps.
> Is it just the refcounting locking that's
> causing it?
Don't know.
> I think the biggest thing here is to figure out how to have pages have
> a lifecycle where the refcount can be inc/dec
It's the same pages, right? Is it just the refcounting locking that's
causing it?
I think the biggest thing here is to figure out how to have pages have
a lifecycle where the refcount can be inc/dec (obviously >1, ie not in
a state where you can dec to 0) via atomics, without grabbing a lock.
I am see lock contetntion cuased by aio read (same file segment from
multiple process simultaneous):
07.74% [26756]lock_delay @ /boot/kernel/kernel
92.21% [24671] __mtx_lock_sleep
52.14% [12864] vm_page_enqueue
100.0% [12864] vm_fault_hold
87.71% [11283]
