tools/power turbostat: Calculate additional node information for a package

The code currently assumes each package has exactly one node.  This is not
the case for AMD systems and Intel systems with COD.  AMD systems also
may re-enumerate each node's core IDs starting at 0 (for example, an AMD
processor may have two nodes, each with core IDs from 0 to 7).  In order
to properly enumerate the cores we need to track both the physical and
logical node IDs.

Add physical_node_id to track the node ID assigned by the kernel, and
logical_node_id used by turbostat to track the nodes per package ie) a
0-based count within the package.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 6bf4268137975503ed844ce4bb6ad0adf5047aec..96390f7e48987d671cf2163d4335d7154ae33dd2 100644 (file)
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -260,7 +260,8 @@ struct system_summary {
 struct cpu_topology {
        int physical_package_id;
        int logical_cpu_id;
-       int node_id;
+       int physical_node_id;
+       int logical_node_id;    /* 0-based count within the package */
        int physical_core_id;
        cpu_set_t *put_ids; /* Processing Unit/Thread IDs */
 } *cpus;
@@ -270,6 +271,8 @@ struct topo_params {
        int num_cpus;
        int num_cores;
        int max_cpu_num;
+       int max_node_num;
+       int num_nodes_per_pkg;
        int num_cores_per_pkg;
        int num_threads_per_core;
 } topo;
@@ -2399,7 +2402,54 @@ int get_core_id(int cpu)
        return parse_int_file("/sys/devices/system/cpu/cpu%d/topology/core_id", cpu);
 }
 
-int get_node_id(struct cpu_topology *thiscpu)
+void set_node_data(void)
+{
+       char path[80];
+       FILE *filep;
+       int pkg, node, cpu;
+
+       struct pkg_node_info {
+               int count;
+               int min;
+       } *pni;
+
+       pni = calloc(topo.num_packages, sizeof(struct pkg_node_info));
+       if (!pni)
+               err(1, "calloc pkg_node_count");
+
+       for (pkg = 0; pkg < topo.num_packages; pkg++)
+               pni[pkg].min = topo.num_cpus;
+
+       for (node = 0; node <= topo.max_node_num; node++) {
+               /* find the "first" cpu in the node */
+               sprintf(path, "/sys/bus/node/devices/node%d/cpulist", node);
+               filep = fopen(path, "r");
+               if (!filep)
+                       continue;
+               fscanf(filep, "%d", &cpu);
+               fclose(filep);
+
+               pkg = cpus[cpu].physical_package_id;
+               pni[pkg].count++;
+
+               if (node < pni[pkg].min)
+                       pni[pkg].min = node;
+       }
+
+       for (pkg = 0; pkg < topo.num_packages; pkg++)
+               if (pni[pkg].count > topo.num_nodes_per_pkg)
+                       topo.num_nodes_per_pkg = pni[0].count;
+
+       for (cpu = 0; cpu < topo.num_cpus; cpu++) {
+               pkg = cpus[cpu].physical_package_id;
+               node = cpus[cpu].physical_node_id;
+               cpus[cpu].logical_node_id = node - pni[pkg].min;
+       }
+       free(pni);
+
+}
+
+int get_physical_node_id(struct cpu_topology *thiscpu)
 {
        char path[80];
        FILE *filep;
@@ -4675,7 +4725,9 @@ void topology_probe()
                        max_package_id = cpus[i].physical_package_id;
 
                /* get numa node information */
-               cpus[i].node_id = get_node_id(&cpus[i]);
+               cpus[i].physical_node_id = get_physical_node_id(&cpus[i]);
+               if (cpus[i].physical_node_id > topo.max_node_num)
+                       topo.max_node_num = cpus[i].physical_node_id;
 
                /* get core information */
                cpus[i].physical_core_id = get_core_id(i);
@@ -4690,9 +4742,10 @@ void topology_probe()
                if (debug > 1)
                        fprintf(outf, "cpu %d pkg %d node %d core %d\n",
                                i, cpus[i].physical_package_id,
-                               cpus[i].node_id,
+                               cpus[i].physical_node_id,
                                cpus[i].physical_core_id);
        }
+
        topo.num_cores_per_pkg = max_core_id + 1;
        if (debug > 1)
                fprintf(outf, "max_core_id %d, sizing for %d cores per package\n",
@@ -4707,6 +4760,10 @@ void topology_probe()
        if (!summary_only && topo.num_packages > 1)
                BIC_PRESENT(BIC_Package);
 
+       set_node_data();
+       if (debug > 1)
+               fprintf(outf, "num_nodes_per_pkg %d\n", topo.num_nodes_per_pkg);
+
        topo.num_threads_per_core = max_siblings;
        if (debug > 1)
                fprintf(outf, "max_siblings %d\n", max_siblings);