From ea1021ffa65a81da3d393fcbd7509d6e40d4d325 Mon Sep 17 00:00:00 2001 From: Palmer Cox Date: Tue, 27 Nov 2012 13:17:47 +0100 Subject: cpupower tools: Fix warning and a bug with the cpu package count The pkgs member of cpupower_topology is being used as the number of cpu packages. As the comment in get_cpu_topology notes, the package ids are not guaranteed to be contiguous. So, simply setting pkgs to the value of the highest physical_package_id doesn't actually provide a count of the number of cpu packages. Instead, calculate pkgs by setting it to the number of distinct physical_packge_id values which is pretty easy to do after the core_info structs are sorted. Calculating pkgs this way also has the nice benefit of getting rid of a sign comparison warning that GCC 4.6 was reporting. Signed-off-by: Palmer Cox Signed-off-by: Thomas Renninger Signed-off-by: Rafael J. Wysocki --- tools/power/cpupower/utils/helpers/topology.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) (limited to 'tools/power') diff --git a/tools/power/cpupower/utils/helpers/topology.c b/tools/power/cpupower/utils/helpers/topology.c index 4e2b583ea17b..c13120af519b 100644 --- a/tools/power/cpupower/utils/helpers/topology.c +++ b/tools/power/cpupower/utils/helpers/topology.c @@ -64,7 +64,7 @@ static int __compare(const void *t1, const void *t2) */ int get_cpu_topology(struct cpupower_topology *cpu_top) { - int cpu, cpus = sysconf(_SC_NPROCESSORS_CONF); + int cpu, last_pkg, cpus = sysconf(_SC_NPROCESSORS_CONF); cpu_top->core_info = malloc(sizeof(struct cpuid_core_info) * cpus); if (cpu_top->core_info == NULL) @@ -78,20 +78,28 @@ int get_cpu_topology(struct cpupower_topology *cpu_top) "physical_package_id", &(cpu_top->core_info[cpu].pkg)) < 0) return -1; - if ((int)cpu_top->core_info[cpu].pkg != -1 && - cpu_top->core_info[cpu].pkg > cpu_top->pkgs) - cpu_top->pkgs = cpu_top->core_info[cpu].pkg; if(sysfs_topology_read_file( cpu, "core_id", &(cpu_top->core_info[cpu].core)) < 0) return -1; } - cpu_top->pkgs++; qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info), __compare); + /* Count the number of distinct pkgs values. This works + because the primary sort of the core_info struct was just + done by pkg value. */ + last_pkg = cpu_top->core_info[0].pkg; + for(cpu = 1; cpu < cpus; cpu++) { + if(cpu_top->core_info[cpu].pkg != last_pkg) { + last_pkg = cpu_top->core_info[cpu].pkg; + cpu_top->pkgs++; + } + } + cpu_top->pkgs++; + /* Intel's cores count is not consecutively numbered, there may * be a core_id of 3, but none of 2. Assume there always is 0 * Get amount of cores by counting duplicates in a package -- cgit v1.2.3