Re: [Xen-devel] [PATCH 4/7] xen: print online pCPUs and free pCPUs when dumping scheduler info

[Juergen Gross <jgross@xxxxxxxx>]

On 03/16/2015 06:05 PM, Dario Faggioli wrote:
> e.g., with  `xl debug-key r'. This change adds something
> like the following lines to the dump output:
>
>    (XEN) Num online Cpus: 16, cpu_online_map: 0-15
>    (XEN) Num free Cpus: 8, cpupool_free_cpus: 8-15
>
> Meaning there are 16 pCPUs online, and they are pCPUs
> 0-15, and that 8 of them, more specifically 8-15, are
> not part of any cpupool.
>
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
> Cc: Juergen Gross <JGross@xxxxxxxx>
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Jan Beulich <JBeulich@xxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>

> ---
>   xen/common/cpupool.c |   13 +++++++++++++
>   1 file changed, 13 insertions(+)
>
> diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
> index cd6aab9..3bf0174 100644
> --- a/xen/common/cpupool.c
> +++ b/xen/common/cpupool.c
> @@ -17,6 +17,7 @@
>   #include <xen/percpu.h>
>   #include <xen/sched.h>
>   #include <xen/sched-if.h>
> +#include <xen/keyhandler.h>
>   #include <xen/cpu.h>
>
>   #define for_each_cpupool(ptr)    \
> @@ -658,6 +659,12 @@ int cpupool_do_sysctl(struct xen_sysctl_cpupool_op *op)
>       return ret;
>   }
>
> +static void _print_cpumap(const char *str, const cpumask_t *map)
> +{
> +    cpulist_scnprintf(keyhandler_scratch, sizeof(keyhandler_scratch), map);
> +    printk("%s: %s\n", str, keyhandler_scratch);
> +}
> +
>   void dump_runq(unsigned char key)
>   {
>       unsigned long    flags;
> @@ -671,12 +678,18 @@ void dump_runq(unsigned char key)
>               sched_smt_power_savings? "enabled":"disabled");
>       printk("NOW=0x%08X%08X\n",  (u32)(now>>32), (u32)now);
>
> +    printk("Num online Cpus: %d, ", cpumask_weight(&cpu_online_map));
> +    _print_cpumap("cpu_online_map", &cpu_online_map);
> +    printk("Num free Cpus: %d, ", cpumask_weight(&cpupool_free_cpus));
> +    _print_cpumap("cpupool_free_cpus", &cpupool_free_cpus);
> +
>       printk("Idle cpupool:\n");
>       schedule_dump(NULL);
>
>       for_each_cpupool(c)
>       {
>           printk("Cpupool %d:\n", (*c)->cpupool_id);
> +        _print_cpumap("Cpus", (*c)->cpu_valid);
>           schedule_dump(*c);
>       }
>
>
>
> _______________________________________________
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> http://lists.xen.org/xen-devel

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