diff options
Diffstat (limited to 'tools/perf/bench/numa.c')
| -rw-r--r-- | tools/perf/bench/numa.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/tools/perf/bench/numa.c b/tools/perf/bench/numa.c index 1fbd7c947abc..19be2aaf4dc0 100644 --- a/tools/perf/bench/numa.c +++ b/tools/perf/bench/numa.c @@ -27,6 +27,7 @@ #include <sys/resource.h> #include <sys/wait.h> #include <sys/prctl.h> +#include <sys/stat.h> #include <sys/types.h> #include <linux/kernel.h> #include <linux/time64.h> @@ -35,6 +36,7 @@ #include "../util/header.h" #include "../util/mutex.h" +#include <api/fs/fs.h> #include <numa.h> #include <numaif.h> @@ -533,6 +535,57 @@ static int parse_cpu_list(const char *arg) return 0; } +/* + * Check whether a CPU is online + * + * Returns: + * 1 -> if CPU is online + * 0 -> if CPU is offline + * -1 -> error case + */ +static int is_cpu_online(unsigned int cpu) +{ + char *str; + size_t strlen; + char buf[256]; + int status = -1; + struct stat statbuf; + + snprintf(buf, sizeof(buf), + "/sys/devices/system/cpu/cpu%d", cpu); + if (stat(buf, &statbuf) != 0) + return 0; + + /* + * Check if /sys/devices/system/cpu/cpux/online file + * exists. Some cases cpu0 won't have online file since + * it is not expected to be turned off generally. + * In kernels without CONFIG_HOTPLUG_CPU, this + * file won't exist + */ + snprintf(buf, sizeof(buf), + "/sys/devices/system/cpu/cpu%d/online", cpu); + if (stat(buf, &statbuf) != 0) + return 1; + + /* + * Read online file using sysfs__read_str. + * If read or open fails, return -1. + * If read succeeds, return value from file + * which gets stored in "str" + */ + snprintf(buf, sizeof(buf), + "devices/system/cpu/cpu%d/online", cpu); + + if (sysfs__read_str(buf, &str, &strlen) < 0) + return status; + + status = atoi(str); + + free(str); + return status; +} + static int parse_setup_cpu_list(void) { struct thread_data *td; |