diff options
Diffstat (limited to 'tools/power/x86/turbostat/turbostat.c')
| -rw-r--r-- | tools/power/x86/turbostat/turbostat.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c index 6436d54378c7..fa60872b9474 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(); |