On 09/29/2016 12:10 PM, Peter Zijlstra wrote: > On Thu, Jul 21, 2016 at 07:45:10AM -0400, Pan Xinhui wrote: >> change from v2: >> no code change, fix typos, update some comments >> >> change from v1: >> a simplier definition of default vcpu_is_preempted >> skip mahcine type check on ppc, and add config. remove dedicated macro. >> add one patch to drop overload of rwsem_spin_on_owner and mutex_spin_on_owner. >> add more comments >> thanks boqun and Peter's suggestion. >> >> This patch set aims to fix lock holder preemption issues. > > So I really like the concept, but I would also really like to see > support for more hypervisors included before we can move forward with > this. > > Please consider s390 and (x86/arm) KVM. Once we have a few, more can > follow later, but I think its important to not only have PPC support for > this. Actually the s390 preemted check via sigp sense running is available for all hypervisors (z/VM, LPAR and KVM) which implies everywhere as you can no longer buy s390 systems without LPAR. As Heiko already pointed out we could simply use a small inline function that calls cpu_is_preempted from arch/s390/lib/spinlock (or smp_vcpu_scheduled from smp.c) Christian -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
