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    SubjectRe: [PATCH v3 0/4] implement vcpu preempted check
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    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

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