RE: [RFC PATCH v2 08/23] sched/topology: Introduce a per-CPU tasks NUMA preferred counter

[Jianyong Wu <wujianyong@hygon.cn>]

> -----Original Message-----
> From: Peter Zijlstra <peterz@infradead.org>
> Sent: Monday, August 31, 2026 9:23 PM
> To: Jianyong Wu <wujianyong@hygon.cn>
> Cc: Ingo Molnar <mingo@redhat.com>; Juri Lelli <juri.lelli@redhat.com>;
> Vincent Guittot <vincent.guittot@linaro.org>; Chen Yu
> <yu.c.chen@intel.com>; Tim Chen <tim.c.chen@linux.intel.com>; Dietmar
> Eggemann <dietmar.eggemann@arm.com>; Steven Rostedt
> <rostedt@goodmis.org>; Ben Segall <bsegall@google.com>; Mel Gorman
> <mgorman@suse.de>; Valentin Schneider <vschneid@redhat.com>; K
> Prateek Nayak <kprateek.nayak@amd.com>; Shrikanth Hegde
> <sshegde@linux.ibm.com>; Phil Auld <pauld@redhat.com>; Andrew
> Morton <akpm@linux-foundation.org>; David Hildenbrand
> <david@kernel.org>; linux-kernel@vger.kernel.org; linux-mm@kvack.org;
> jianyong.wu@outlook.com; Yuan Zhong <zhongyuan@hygon.cn>; Huangsj
> <huangsj@hygon.cn>; Fengyu Wang <wangfengyu@hygon.cn>; Zhiwei Ying
> <yingzhiwei@hygon.cn>; justin.he@arm.com
> Subject: Re: [RFC PATCH v2 08/23] sched/topology: Introduce a per-CPU
> tasks NUMA preferred counter
> 
> On Thu, Aug 27, 2026 at 08:28:01PM +0800, Jianyong Wu wrote:
> > Like the existed task LLC preferred counter, sd->llc_counts, introduce
> > sd->numa_counts to denotes the task number that prefer each NUMA
> node in
> > a certain rq.
> >
> > Signed-off-by: Jianyong Wu <wujianyong@hygon.cn>
> > ---
> >  include/linux/sched/topology.h |  1 +
> >  kernel/sched/topology.c        | 33
> +++++++++++++++++++++++++++------
> >  2 files changed, 28 insertions(+), 6 deletions(-)
> >
> > diff --git a/include/linux/sched/topology.h
> b/include/linux/sched/topology.h
> > index b5d9d7c2b8ad..b31d2cf16592 100644
> > --- a/include/linux/sched/topology.h
> > +++ b/include/linux/sched/topology.h
> > @@ -121,6 +121,7 @@ struct sched_domain {
> >  	unsigned int llc_max;
> >  	unsigned int *llc_counts __counted_by_ptr(llc_max);
> >  	unsigned long llc_bytes;
> > +	unsigned int *numa_counts;
> 
> This is missing a __counted_by_ptr() annotation ?

Right, I missed that. numa_counts is sized by nr_node_ids, so I'll add a
numa_max field to struct sched_domain and annotate it with
__counted_by_ptr(numa_max) in the next revision.

Thanks
Jianyong