Mark Kettenis wrote:
> > /* For user defined stacks (from sendsig). */
> > if (sp < (vaddr_t)vm->vm_maxsaddr)
> > - return;
> > + goto out;
>
> Since vm_maxsaddr is ummutable, this check can be done without holding
> the lock. I think that's worth it as it will preve
> Date: Wed, 14 Oct 2020 12:01:10 +0200
> From: Martin Pieuchot
>
> Getting uvm_fault() out of the KERNEL_LOCK() alone is not enough to
> reduce the contention due to page faults. A single part of the handler
> spinning on the lock is enough to hide bugs and increase latency. One
> recent examp
Getting uvm_fault() out of the KERNEL_LOCK() alone is not enough to
reduce the contention due to page faults. A single part of the handler
spinning on the lock is enough to hide bugs and increase latency. One
recent example is the uvm_map_inentry() check.
uvm_grow() is another small function cal
