Re: [PATCH 1/3] kernel/sched: introduce vcpu preempted check interface

[xinhui]

On 2016å06æ27æ 22:02, Peter Zijlstra wrote:
> On Mon, Jun 27, 2016 at 04:00:43PM +0200, Peter Zijlstra wrote:
> > On Mon, Jun 27, 2016 at 01:41:28PM -0400, Pan Xinhui wrote:
> > > +++ b/include/linux/sched.h
> > > @@ -3293,6 +3293,15 @@ static inline void set_task_cpu(struct task_struct *p, unsigned int cpu)
> > >
> > >   #endif /* CONFIG_SMP */
> > >
> > > +#ifdef arch_vcpu_is_preempted
> > > +static inline bool vcpu_is_preempted(int cpu)
> > > +{
> > > +	return arch_vcpu_is_preempted(cpu);
> > > +}
> > > +#else
> > > +#define vcpu_is_preempted(cpu)	false
> > > +#endif
> >
> > #ifndef vcpu_is_preempted
> > #define vcpu_is_preempted(cpu)		(false)
> > #endif
> >
> > Is so much simpler...
fair enough.

> > Also, please Cc the virt list so that other interested parties can
> > comment, and maybe also the s390 folks.
oh. I forgot that. maybe we need cc more.

root@ltcalpine2-lp13:~/linux# find ./arch -name kvm
./arch/arm/kvm
./arch/arm64/kvm
./arch/mips/kvm
./arch/powerpc/kvm
./arch/s390/kvm
./arch/tile/kvm
./arch/x86/kvm

> And before you hurry off to post again, add a patch doing
> mutex_spin_on_owner() and rwsem_spin_in_owner().
will do that.

thanks for your suggestion. :)