Re: [PATCH v5 0/2] sched: Enable preferred SMT siblings on NVIDIA Olympus

[Will Deacon]

On Wed, Sep 09, 2026 at 03:14:15PM +0200, Peter Zijlstra wrote:
> On Wed, Sep 09, 2026 at 08:26:07AM +0200, Andrea Righi wrote:
> 
> > Andrea Righi (2):
> >       arm64: topology: Prefer PE0 on NVIDIA Olympus SMT cores
> >       sched/fair: Honor asymmetric SMT priority in idle selection
> > 
> >  arch/arm64/include/asm/topology.h |  1 +
> >  arch/arm64/kernel/smp.c           |  1 +
> >  arch/arm64/kernel/topology.c      | 51 +++++++++++++++++++++++
> >  kernel/sched/fair.c               | 85 +++++++++++++++++++++++++++++++--------
> >  kernel/sched/sched.h              |  6 +++
> >  kernel/sched/topology.c           | 36 +++++++++++++++++
> >  6 files changed, 163 insertions(+), 17 deletions(-)
> 
> I tentatively picked these up, but I need an arm64 ack before I can
> merge them, and ideally vingu will bless them too :-)

We've had five versions of this in five minutes, but the arch code is
pretty filthy tbh. Detecting topology based on MIDR is a non-starter,
sorry.

Will