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Re: [Xen-devel] [PATCH RFC 08/49] xen/sched: use new sched_item instead of vcpu in scheduler interfaces


  • To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
  • Date: Fri, 29 Mar 2019 18:42:53 +0000
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  • Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Robert VanVossen <robert.vanvossen@xxxxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Josh Whitehead <josh.whitehead@xxxxxxxxxxxxxxx>, Meng Xu <mengxu@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
  • Delivery-date: Fri, 29 Mar 2019 18:43:05 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

On 29/03/2019 15:08, Juergen Gross wrote:
> diff --git a/xen/common/schedule.c b/xen/common/schedule.c
> index 6b5d454630..d1a958143a 100644
> --- a/xen/common/schedule.c
> +++ b/xen/common/schedule.c
> @@ -256,6 +256,7 @@ static void sched_spin_unlock_double(spinlock_t *lock1, 
> spinlock_t *lock2,
>  int sched_init_vcpu(struct vcpu *v, unsigned int processor)
>  {
>      struct domain *d = v->domain;
> +    struct sched_item item = { .vcpu = v };
>  
>      v->processor = processor;
>  
> @@ -267,7 +268,7 @@ int sched_init_vcpu(struct vcpu *v, unsigned int 
> processor)
>      init_timer(&v->poll_timer, poll_timer_fn,
>                 v, v->processor);
>  
> -    v->sched_priv = SCHED_OP(dom_scheduler(d), alloc_vdata, v,
> +    v->sched_priv = SCHED_OP(dom_scheduler(d), alloc_vdata, &item,
>                       d->sched_priv);

I realise this is perhaps an over-the-top request, but can we see about
doing more here?

SCHED_OP() is a thoroughly objectionable piece of obfuscation, which
breaks cscope/ctags and also results in especially poor code generation.

Given that we are changing the interface anyway and touching all
codepaths, would you mind also adding static inline wrappers like I
started with 340edc3 ?

TBH, I'm even happy to give this a go and give you the back the
resulting tree, if you'd prefer.

~Andrew

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