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

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:

quoted

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