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Diffstat (limited to 'tools/power/x86/turbostat/turbostat.c')
-rw-r--r--tools/power/x86/turbostat/turbostat.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
index 6436d54378c..fa60872b947 100644
--- a/tools/power/x86/turbostat/turbostat.c
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -19,6 +19,7 @@
* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
*/
+#define _GNU_SOURCE
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
@@ -32,6 +33,7 @@
#include <dirent.h>
#include <string.h>
#include <ctype.h>
+#include <sched.h>
#define MSR_TSC 0x10
#define MSR_NEHALEM_PLATFORM_INFO 0xCE
@@ -72,6 +74,8 @@ char *progname;
int need_reinitialize;
int num_cpus;
+cpu_set_t *cpu_mask;
+size_t cpu_mask_size;
struct counters {
unsigned long long tsc; /* per thread */
@@ -100,6 +104,40 @@ struct timeval tv_even;
struct timeval tv_odd;
struct timeval tv_delta;
+/*
+ * cpu_mask_init(ncpus)
+ *
+ * allocate and clear cpu_mask
+ * set cpu_mask_size
+ */
+void cpu_mask_init(int ncpus)
+{
+ cpu_mask = CPU_ALLOC(ncpus);
+ if (cpu_mask == NULL) {
+ perror("CPU_ALLOC");
+ exit(3);
+ }
+ cpu_mask_size = CPU_ALLOC_SIZE(ncpus);
+ CPU_ZERO_S(cpu_mask_size, cpu_mask);
+}
+
+void cpu_mask_uninit()
+{
+ CPU_FREE(cpu_mask);
+ cpu_mask = NULL;
+ cpu_mask_size = 0;
+}
+
+int cpu_migrate(int cpu)
+{
+ CPU_ZERO_S(cpu_mask_size, cpu_mask);
+ CPU_SET_S(cpu, cpu_mask_size, cpu_mask);
+ if (sched_setaffinity(0, cpu_mask_size, cpu_mask) == -1)
+ return -1;
+ else
+ return 0;
+}
+
unsigned long long get_msr(int cpu, off_t offset)
{
ssize_t retval;
@@ -471,6 +509,11 @@ void compute_average(struct counters *delta, struct counters *avg)
void get_counters(struct counters *cnt)
{
for ( ; cnt; cnt = cnt->next) {
+ if (cpu_migrate(cnt->cpu)) {
+ need_reinitialize = 1;
+ return;
+ }
+
cnt->tsc = get_msr(cnt->cpu, MSR_TSC);
if (do_nhm_cstates)
cnt->c3 = get_msr(cnt->cpu, MSR_CORE_C3_RESIDENCY);
@@ -752,6 +795,8 @@ void re_initialize(void)
free_all_counters();
num_cpus = for_all_cpus(alloc_new_counters);
need_reinitialize = 0;
+ cpu_mask_uninit();
+ cpu_mask_init(num_cpus);
printf("num_cpus is now %d\n", num_cpus);
}
@@ -984,6 +1029,7 @@ void turbostat_init()
check_super_user();
num_cpus = for_all_cpus(alloc_new_counters);
+ cpu_mask_init(num_cpus);
if (verbose)
print_nehalem_info();