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Re: [PATCH v2 2/3] xen/sched: Link CPU topology to scheduler
- To: Hirokazu Takahashi <taka@xxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 22 Jun 2026 15:23:48 +0200
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- Cc: Mykyta_Poturai@xxxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, George Dunlap <gwd@xxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 22 Jun 2026 13:23:59 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.06.2026 09:12, Hirokazu Takahashi wrote:
> --- a/xen/common/sched/credit2.c
> +++ b/xen/common/sched/credit2.c
> @@ -19,6 +19,7 @@
> #include <xen/softirq.h>
> #include <xen/time.h>
> #include <xen/trace.h>
> +#include <xen/cpu-topology.h>
>
> #include <asm/div64.h>
>
> @@ -37,6 +38,8 @@ static unsigned int cpu_nr_siblings(unsigned int cpu)
> {
> #ifdef CONFIG_X86
> return cpu_data[cpu].x86_num_siblings;
> +#elif defined(CONFIG_CPU_TOPOLOGY)
> + return cpu_topology[cpu].num_siblings;
Would this better be the other way around (first the generic thing, then the
x86 one)?
> --- a/xen/drivers/acpi/topology.c
> +++ b/xen/drivers/acpi/topology.c
> @@ -22,6 +22,9 @@ void __init acpi_init_cpu_topology(void)
> {
> struct cpu_topology *topo = &cpu_topology[cpu];
>
> + topo->phys_core_id = cpu;
> + topo->num_siblings = 1U;
In the interest of readability suffixes may better be omitted from literal
numbers when they aren't really needed. Which, btw, doesn't extend to ..
> --- a/xen/include/xen/cpu-topology.h
> +++ b/xen/include/xen/cpu-topology.h
> @@ -10,6 +10,10 @@ struct cpu_topology {
> cpumask_t thread_sibling;
> cpumask_t core_sibling;
> cpumask_t cluster_sibling;
> + unsigned int phys_core_id;
> + unsigned int phys_cluster_id;
> + unsigned int phys_socket_id;
> + unsigned int num_siblings;
> };
>
>
> @@ -18,10 +22,16 @@ struct cpu_topology {
> extern struct cpu_topology *cpu_topology;
> void init_cpu_topology(void);
>
> +#define cpu_to_core(cpu) (cpu_topology[cpu].phys_core_id)
> +#define cpu_to_socket(cpu) (cpu_topology[cpu].phys_socket_id)
> +
> #else /* CONFIG_CPU_TOPOLOGY */
>
> static inline void init_cpu_topology(void) {}
>
> +#define cpu_to_core(cpu) (0U)
> +#define cpu_to_socket(cpu) (0U)
... such uses (in particular stub/fallback ones) in header files.
Jan
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