linux-kernel - Re: [PATCH v2 2/3] x86, x2apic: limit the vector reservation to the user specified mask

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Date:	Mon, 25 Jun 2012 11:54:07 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	Alexander Gordeev <agordeev@...hat.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org, gorcunov@...nvz.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: Re: [PATCH v2 2/3] x86, x2apic: limit the vector reservation to the
 user specified mask


* Yinghai Lu <yinghai@...nel.org> wrote:

> On Thu, Jun 21, 2012 at 3:02 PM, Suresh Siddha
> <suresh.b.siddha@...el.com> wrote:
> > For the x2apic cluster mode, vector for an interrupt is currently reserved on
> > all the cpu's that are part of the x2apic cluster. But the interrupts will
> > be routed only to the cluster (derived from the first cpu in the mask) members
> > specified in the mask. So there is no need to reserve the vector in the unused
> > cluster members.
> >
> > Modify __assign_irq_vector() to reserve the vectors based on the user
> > specified irq destination mask. If the new mask is a proper subset of
> > the currently used mask, cleanup the vector allocation on the unused cpu
> > members.
> >
> > Also, allow the apic driver to tune the vector domain based on the
> > affinity mask (which in most cases is the user-specified mask).
> >
> > Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> > Acked-by: Yinghai Lu <yinghai@...nel.org>
> > ---
> >  arch/x86/include/asm/apic.h           |    9 ++++++---
> >  arch/x86/kernel/apic/apic_noop.c      |    3 ++-
> >  arch/x86/kernel/apic/io_apic.c        |   31 +++++++++++++++----------------
> >  arch/x86/kernel/apic/x2apic_cluster.c |    6 +++---
> >  4 files changed, 26 insertions(+), 23 deletions(-)
> >
> > diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
> > index b37fa12..c276809 100644
> > --- a/arch/x86/include/asm/apic.h
> > +++ b/arch/x86/include/asm/apic.h
> > @@ -306,7 +306,8 @@ struct apic {
> >        unsigned long (*check_apicid_used)(physid_mask_t *map, int apicid);
> >        unsigned long (*check_apicid_present)(int apicid);
> >
> > -       void (*vector_allocation_domain)(int cpu, struct cpumask *retmask);
> > +       void (*vector_allocation_domain)(int cpu, struct cpumask *retmask,
> > +                                        const struct cpumask *mask);
> 
> there is one left over for vsmp_64 need to be updated.
> 
> arch/x86/kernel/vsmp_64.c: In function ‘vsmp_apic_post_init’:
> arch/x86/kernel/vsmp_64.c:221:33: warning: assignment from
> incompatible pointer type [enabled by default]

Other than this omission the series looks good to me as well, if 
this is fixed and the Acked-by's of the three gents is added to 
all three patches then I can apply it to -tip.

Thanks,

	Ingo
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