Re: [Xen-devel] [PATCH v2 3/5] xen: print online pCPUs and free pCPUs when dumping

[Juergen Gross <jgross@xxxxxxxx>]

On 03/17/2015 04:33 PM, Dario Faggioli wrote:
> e.g., with  `xl debug-key r', like this:
>
>    (XEN) Online Cpus: 0-15
>    (XEN) Free Cpus: 8-15
>
> Also, for each cpupool, print the set of pCPUs it
> contains, like this:
>
>    (XEN) Cpupool 0:
>    (XEN) Cpus: 0-7
>    (XEN) Scheduler: SMP Credit Scheduler (credit)
>
> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>

> Cc: Juergen Gross <JGross@xxxxxxxx>
> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
> Cc: Jan Beulich <JBeulich@xxxxxxxx>
> Cc: Keir Fraser <keir@xxxxxxx>
> ---
> Changes from v1:
>   * _print_cpumap() becomes print_cpumap() (i.e., the
>     leading '_' was not particularly useful in this
>     case), as suggested during review
>   * changed the output such as (1) we only print the
>     maps, not the number of elements, and (2) we avoid
>     printing the free cpus map when empty
>   * improved the changelog
> ---
> I'm not including any Reviewed-by / Acked-by tag,
> since the patch changed.
> ---
>   xen/common/cpupool.c |   12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
> index cd6aab9..812a2f9 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 +678,17 @@ void dump_runq(unsigned char key)
>               sched_smt_power_savings? "enabled":"disabled");
>       printk("NOW=0x%08X%08X\n",  (u32)(now>>32), (u32)now);
>
> +    print_cpumap("Online Cpus", &cpu_online_map);
> +    if ( cpumask_weight(&cpupool_free_cpus) )
> +        print_cpumap("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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