7c74d2bc5a
Before, checking for offlined CPUs was done dirty and it was checked whether topology parsing returned -1 values. But this is a valid case on a Xen (and possibly other) kernels. Do proper online/offline checking, also take CONFIG_HOTPLUG_CPU option into account (no /sys/devices/../cpuX/online file). Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
111 lines
3 KiB
C
111 lines
3 KiB
C
/*
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* (C) 2010,2011 Thomas Renninger <trenn@suse.de>, Novell Inc.
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*
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* Licensed under the terms of the GNU GPL License version 2.
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*
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* ToDo: Needs to be done more properly for AMD/Intel specifics
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*/
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/* Helper struct for qsort, must be in sync with cpupower_topology.cpu_info */
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/* Be careful: Need to pass unsigned to the sort, so that offlined cores are
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in the end, but double check for -1 for offlined cpus at other places */
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <helpers/helpers.h>
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#include <helpers/sysfs.h>
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/* returns -1 on failure, 0 on success */
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int sysfs_topology_read_file(unsigned int cpu, const char *fname)
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{
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unsigned long value;
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char linebuf[MAX_LINE_LEN];
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char *endp;
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char path[SYSFS_PATH_MAX];
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snprintf(path, sizeof(path), PATH_TO_CPU "cpu%u/topology/%s",
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cpu, fname);
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if (sysfs_read_file(path, linebuf, MAX_LINE_LEN) == 0)
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return -1;
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value = strtoul(linebuf, &endp, 0);
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if (endp == linebuf || errno == ERANGE)
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return -1;
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return value;
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}
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struct cpuid_core_info {
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unsigned int pkg;
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unsigned int thread;
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unsigned int cpu;
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/* flags */
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unsigned int is_online:1;
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};
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static int __compare(const void *t1, const void *t2)
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{
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struct cpuid_core_info *top1 = (struct cpuid_core_info *)t1;
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struct cpuid_core_info *top2 = (struct cpuid_core_info *)t2;
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if (top1->pkg < top2->pkg)
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return -1;
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else if (top1->pkg > top2->pkg)
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return 1;
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else if (top1->thread < top2->thread)
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return -1;
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else if (top1->thread > top2->thread)
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return 1;
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else if (top1->cpu < top2->cpu)
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return -1;
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else if (top1->cpu > top2->cpu)
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return 1;
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else
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return 0;
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}
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/*
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* Returns amount of cpus, negative on error, cpu_top must be
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* passed to cpu_topology_release to free resources
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*
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* Array is sorted after ->pkg, ->core, then ->cpu
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*/
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int get_cpu_topology(struct cpupower_topology *cpu_top)
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{
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int cpu, cpus = sysconf(_SC_NPROCESSORS_CONF);
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cpu_top->core_info = malloc(sizeof(struct cpupower_topology) * cpus);
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if (cpu_top->core_info == NULL)
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return -ENOMEM;
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cpu_top->pkgs = cpu_top->cores = 0;
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for (cpu = 0; cpu < cpus; cpu++) {
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cpu_top->core_info[cpu].cpu = cpu;
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cpu_top->core_info[cpu].is_online = sysfs_is_cpu_online(cpu);
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cpu_top->core_info[cpu].pkg =
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sysfs_topology_read_file(cpu, "physical_package_id");
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if ((int)cpu_top->core_info[cpu].pkg != -1 &&
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cpu_top->core_info[cpu].pkg > cpu_top->pkgs)
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cpu_top->pkgs = cpu_top->core_info[cpu].pkg;
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cpu_top->core_info[cpu].core =
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sysfs_topology_read_file(cpu, "core_id");
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}
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cpu_top->pkgs++;
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qsort(cpu_top->core_info, cpus, sizeof(struct cpuid_core_info),
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__compare);
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/* Intel's cores count is not consecutively numbered, there may
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* be a core_id of 3, but none of 2. Assume there always is 0
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* Get amount of cores by counting duplicates in a package
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for (cpu = 0; cpu_top->core_info[cpu].pkg = 0 && cpu < cpus; cpu++) {
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if (cpu_top->core_info[cpu].core == 0)
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cpu_top->cores++;
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*/
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return cpus;
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}
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void cpu_topology_release(struct cpupower_topology cpu_top)
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{
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free(cpu_top.core_info);
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}
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