Re: [PATCH v6 for Xen 4.7 4/4] xl: enable per-VCPU parameter settings for RTDS scheduler

[Wei Liu <wei.liu2@citrix.com>]

On Sun, Mar 06, 2016 at 11:55:58AM -0600, Chong Li wrote:
[...]
> @@ -6222,77 +6359,166 @@ int main_sched_rtds(int argc, char **argv)
>  {
>      const char *dom = NULL;
>      const char *cpupool = NULL;
> -    int period = 0; /* period is in microsecond */
> -    int budget = 0; /* budget is in microsecond */
> +    int *vcpus = (int *)xmalloc(sizeof(int)); /* IDs of VCPUs that change */
> +    int *periods = (int *)xmalloc(sizeof(int)); /* period is in microsecond */
> +    int *budgets = (int *)xmalloc(sizeof(int)); /* budget is in microsecond */
> +    int v_size = 1; /* size of vcpus array */
> +    int p_size = 1; /* size of periods array */
> +    int b_size = 1; /* size of budgets array */
> +    int v_index = 0; /* index in vcpus array */
> +    int p_index =0; /* index in periods array */
> +    int b_index =0; /* index for in budgets array */
>      bool opt_p = false;
>      bool opt_b = false;
> -    int opt, rc;
> +    bool opt_v = false;
> +    bool opt_all = false; /* output per-dom parameters */
> +    int opt, i;
> +    int rc = 0;
>      static struct option opts[] = {
>          {"domain", 1, 0, 'd'},
>          {"period", 1, 0, 'p'},
>          {"budget", 1, 0, 'b'},
> +        {"vcpuid",1, 0, 'v'},
>          {"cpupool", 1, 0, 'c'},
>          COMMON_LONG_OPTS
>      };
>  
> -    SWITCH_FOREACH_OPT(opt, "d:p:b:c:", opts, "sched-rtds", 0) {
> +    SWITCH_FOREACH_OPT(opt, "d:p:b:v:c", opts, "sched-rtds", 0) {
>      case 'd':
>          dom = optarg;
>          break;
>      case 'p':
> -        period = strtol(optarg, NULL, 10);
> +        if (p_index >= p_size) { /* periods array is full */
> +            p_size *= 2;
> +            periods = xrealloc(periods, p_size);
> +        }
> +        periods[p_index++] = strtol(optarg, NULL, 10);
>          opt_p = 1;
>          break;
>      case 'b':
> -        budget = strtol(optarg, NULL, 10);
> +        if (b_index >= b_size) { /* budgets array is full */
> +            b_size *= 2;
> +            budgets = xrealloc(budgets, b_size);
> +        }
> +        budgets[b_index++] = strtol(optarg, NULL, 10);
>          opt_b = 1;
>          break;
> +    case 'v':
> +        if (!strcmp(optarg, "all")) { /* get or set all vcpus of a domain */
> +            opt_all = 1;
> +            break;
> +        }
> +        if (v_index >= v_size) { /* vcpus array is full */
> +            v_size *= 2;
> +            vcpus = xrealloc(vcpus, v_size);
> +        }
> +        vcpus[v_index++] = strtol(optarg, NULL, 10);
> +        opt_v = 1;
> +        break;

I'm still not quite sure why this is written like this. What's the
expected syntax of this command? The hunk to patch xl manpage is very
terse...

Wei.

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