Re: [Xen-devel] [PATCH] xen: put cpupool's member 'n_dom' after 'cpupool_id'

[chenbaodong <chenbaodong@xxxxxxxxxx>]

On 6/3/19 17:30, Julien Grall wrote:
> Hi,
>
> On 03/06/2019 02:48, chenbaodong wrote:
> > On 5/31/19 18:52, Julien Grall wrote:
> > > Hi,
> > >
> > > On 5/31/19 4:18 AM, Baodong Chen wrote:
> > > > Thus, sizeof(struct cpupool) will save 8 bytes for 64-bit system.
> > > I am happy with the change, although AFAIK cpupool is not 
> > > instantiated that often. Are you planning to have more instantiation 
> > > of it?
> > > Cheers,
> > No, I'm not planning to create lots of cpupool instance.
> >
> > I'm studying xen for a few weeks and my plan is:
> >
> > run xen for embeded automotive use case with dom0less, null 
> > scheduler, small code base for safety certified maybe a plus(not sure 
> > whether can do this).
> FWIW, there are discussion to get Xen safety certified. They are 
> captured on [1].
> Cheers,
>
> [1] 
> https://wiki.xenproject.org/wiki/Category:Safety_Certification/FuSa_SIG
Hello Julien, Thanks for your info.

I will follow the wiki link and see what i can do about safety 
certification.
> > > > Signed-off-by: Baodong Chen <chenbaodong@xxxxxxxxxx>
> > > > ---
> > > >   xen/include/xen/sched-if.h | 2 +-
> > > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/xen/include/xen/sched-if.h b/xen/include/xen/sched-if.h
> > > > index 92bc7a0..f0cf210 100644
> > > > --- a/xen/include/xen/sched-if.h
> > > > +++ b/xen/include/xen/sched-if.h
> > > > @@ -213,9 +213,9 @@ static inline void sched_free_domdata(const 
> > > > struct scheduler *s,
> > > >   struct cpupool
> > > >   {
> > > >       int              cpupool_id;
> > > > +    unsigned int     n_dom;
> > > >       cpumask_var_t    cpu_valid;      /* all cpus assigned to pool */
> > > >       struct cpupool   *next;
> > > > -    unsigned int     n_dom;
> > > >       struct scheduler *sched;
> > > >       atomic_t         refcnt;
> > > >   };
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