Re: crazy idea: big percpu lock (Re: task isolation)

Thomas Gleixner
2015-10-09T09:28:13Z

On Thu, 8 Oct 2015, Andy Lutomirski wrote:
> I want to propose a new primitive that might go a long way toward
> solving this issue. The new primitive would be called the "big percpu
> lock".

It took us 15+ years to get rid of the "Big Kernel Lock", so we really
don't want to add a new "Big XXX Lock". We have enough pain already
with preempt_disable() and local_irq_disable() which are basically
"Big CPU Locks".

Don't ever put BIG and LOCK into one context, really.

Thanks,

tglx