This patch is to make xentop able to print vcpu usage for out of order

enabled vcpus in a domain. This really isn't an issue anymore with the
changes made to dom0 ops and xm/xend. 

But, I provide it because:

- Josh noticed my previous patch called getvcpuinfo twice for each vpcu,
which was completely silly.

- this patch would be useful in the remote chance that domain vpcus are
enabled out of order. 

Signed-off-by: Daniel Stekloff <dsteklof@us.ibm.com>

tools/xenstat/libxenstat/src/xen-interface.c

@@ -173,9 +173,9 @@ int xi_get_domaininfolist(xi_handle *handle, dom0_getdomaininfo_t *info,
 	return op.u.getdomaininfolist.num_domains;
 }
 
-/* Returns cpu usage data from dom0 */
-long long xi_get_vcpu_usage(xi_handle *handle, unsigned int domain,
-                            unsigned int vcpu)
+/* Get vcpu info from a domain */
+int xi_get_domain_vcpu_info(xi_handle *handle, unsigned int domain, 
+                            unsigned int vcpu, dom0_getvcpuinfo_t *info)
 {
 	dom0_op_t op;
 	op.u.getvcpuinfo.domain = domain;
@@ -186,7 +186,9 @@ long long xi_get_vcpu_usage(xi_handle *handle, unsigned int domain,
 		return -1;
 	}
 
-	return op.u.getvcpuinfo.cpu_time;
+	memcpy(info, &op.u.getvcpuinfo, sizeof(dom0_getvcpuinfo_t));
+
+	return 0;
 }
 
 /* gets xen version information from hypervisor */

tools/xenstat/libxenstat/src/xen-interface.h

@@ -41,5 +41,6 @@ int xi_get_physinfo(xi_handle *, dom0_physinfo_t *);
 int xi_get_domaininfolist(xi_handle *, dom0_getdomaininfo_t *, unsigned int,
                           unsigned int);
 
-/* Returns cpu usage data from dom0 */
-long long xi_get_vcpu_usage(xi_handle *, unsigned int, unsigned int);
+/* Get vcpu info from a domain */
+int xi_get_domain_vcpu_info(xi_handle *, unsigned int, unsigned int,
+                            dom0_getvcpuinfo_t *);

tools/xenstat/libxenstat/src/xenstat.c

@@ -51,7 +51,7 @@ struct xenstat_domain {
 	unsigned int id;
 	unsigned int state;
 	unsigned long long cpu_ns;
-	unsigned int num_vcpus;
+	unsigned int num_vcpus;		/* No. vcpus configured for domain */
 	xenstat_vcpu *vcpus;		/* Array of length num_vcpus */
 	unsigned long long cur_mem;	/* Current memory reservation */
 	unsigned long long max_mem;	/* Total memory allowed */
@@ -61,6 +61,7 @@ struct xenstat_domain {
 };
 
 struct xenstat_vcpu {
+	unsigned int online;
 	unsigned long long ns;
 };
 
@@ -229,7 +230,7 @@ xenstat_node *xenstat_get_node(xenstat_handle * handle, unsigned int flags)
 			domain->id = domaininfo[i].domain;
 			domain->state = domaininfo[i].flags;
 			domain->cpu_ns = domaininfo[i].cpu_time;
-			domain->num_vcpus = domaininfo[i].nr_online_vcpus;
+			domain->num_vcpus = (domaininfo[i].max_vcpu_id+1);
 			domain->vcpus = NULL;
 			domain->cur_mem =
 			    ((unsigned long long)domaininfo[i].tot_pages)
@@ -344,7 +345,7 @@ unsigned long long xenstat_domain_cpu_ns(xenstat_domain * domain)
 	return domain->cpu_ns;
 }
 
-/* Find the number of VCPUs allocated to a domain */
+/* Find the number of VCPUs for a domain */
 unsigned int xenstat_domain_num_vcpus(xenstat_domain * domain)
 {
 	return domain->num_vcpus;
@@ -432,22 +433,24 @@ xenstat_network *xenstat_domain_network(xenstat_domain * domain,
 static int xenstat_collect_vcpus(xenstat_node * node)
 {
 	unsigned int i, vcpu;
+
 	/* Fill in VCPU information */
 	for (i = 0; i < node->num_domains; i++) {
 		node->domains[i].vcpus = malloc(node->domains[i].num_vcpus
 						* sizeof(xenstat_vcpu));
 		if (node->domains[i].vcpus == NULL)
 			return 0;
-
+	
 		for (vcpu = 0; vcpu < node->domains[i].num_vcpus; vcpu++) {
 			/* FIXME: need to be using a more efficient mechanism*/
-			long long vcpu_time;
-			vcpu_time = xi_get_vcpu_usage(node->handle->xihandle,
-						      node->domains[i].id,
-						      vcpu);
-			if (vcpu_time < 0)
+			dom0_getvcpuinfo_t info;
+
+			if (xi_get_domain_vcpu_info(node->handle->xihandle,
+			    node->domains[i].id, vcpu, &info) != 0)
 				return 0;
-			node->domains[i].vcpus[vcpu].ns = vcpu_time;
+
+			node->domains[i].vcpus[vcpu].online = info.online;
+			node->domains[i].vcpus[vcpu].ns = info.cpu_time;
 		}
 	}
 	return 1;
@@ -466,6 +469,12 @@ static void xenstat_uninit_vcpus(xenstat_handle * handle)
 {
 }
 
+/* Get VCPU online status */
+unsigned int xenstat_vcpu_online(xenstat_vcpu * vcpu)
+{
+	return vcpu->online;
+}
+
 /* Get VCPU usage */
 unsigned long long xenstat_vcpu_ns(xenstat_vcpu * vcpu)
 {

tools/xenstat/libxenstat/src/xenstat.h

@@ -119,6 +119,7 @@ xenstat_network *xenstat_domain_network(xenstat_domain * domain,
  */
 
 /* Get VCPU usage */
+unsigned int xenstat_vcpu_online(xenstat_vcpu * vcpu);
 unsigned long long xenstat_vcpu_ns(xenstat_vcpu * vcpu);
 
 

tools/xenstat/xentop/xentop.c

@@ -713,13 +713,16 @@ void do_vcpu(xenstat_domain *domain)
 
 	num_vcpus = xenstat_domain_num_vcpus(domain);
 
-	/* for all vcpus dump out values */
+	/* for all online vcpus dump out values */
 	for (i=0; i< num_vcpus; i++) {
 		vcpu = xenstat_domain_vcpu(domain,i);
 
-		if (i != 0 && (i%5)==0)
-			print("\n        ");
-		print(" %2u: %10llus", i, xenstat_vcpu_ns(vcpu)/1000000000);
+		if (xenstat_vcpu_online(vcpu) > 0) {
+			if (i != 0 && (i%5)==0)
+				print("\n        ");
+			print(" %2u: %10llus", i, 
+					xenstat_vcpu_ns(vcpu)/1000000000);
+		}
 	}
 	print("\n");
 }