#include <ctype.h>
#include <sched.h>
#include <cpuid.h>
+#include <sys/capability.h>
#define PLUGIN_NAME "turbostat"
if (!aperf_mperf_unstable)
turbostat_submit(name, "percent", "c1", 100.0 * t->c1/t->tsc);
- /* GHz */
+ turbostat_submit("Average", "frequency", name, 1.0 / 1000000 * t->aperf / interval_float);
+
if ((!aperf_mperf_unstable) || (!(t->aperf > t->tsc || t->mperf > t->tsc)))
- turbostat_submit(NULL, "frequency", name, 1.0 * t->tsc / 1000000000 * t->aperf / t->mperf / interval_float);
+ turbostat_submit("Buzy", "frequency", name, 1.0 * t->tsc / 1000000 * t->aperf / t->mperf / interval_float);
+
+ /* Sanity check (should stay stable) */
+ turbostat_submit("TSC", "gauge", name, 1.0 * t->tsc / 1000000 / interval_float);
/* SMI */
turbostat_submit(NULL, "current", name, t->smi_count);
break;
/* Silvermont */
case 0x37: /* BYT */
- case 0x4A:
case 0x4D: /* AVN */
- case 0x5A:
- case 0x5D:
do_core_cstate = (1 << 1) | (1 << 6);
do_pkg_cstate = (1 << 6);
break;
}
static int
+check_permissions(void)
+{
+ struct __user_cap_header_struct cap_header_data;
+ cap_user_header_t cap_header = &cap_header_data;
+ struct __user_cap_data_struct cap_data_data;
+ cap_user_data_t cap_data = &cap_data_data;
+ int ret = 0;
+
+ if (getuid() == 0) {
+ /* We have everything we need */
+ return 0;
+ }
+
+ /* check for CAP_SYS_RAWIO */
+ cap_header->pid = getpid();
+ cap_header->version = _LINUX_CAPABILITY_VERSION;
+ if (capget(cap_header, cap_data) < 0) {
+ ERROR("Turbostat plugin: capget failed");
+ return -1;
+ }
+
+ if ((cap_data->effective & (1 << CAP_SYS_RAWIO)) == 0) {
+ WARNING("Turbostat plugin: Collectd doesn't have the "
+ "CAP_SYS_RAWIO capability. If you don't want to run "
+ "collectd as root, try running \"setcap "
+ "cap_sys_rawio=ep\" on collectd binary");
+ ret = -1;
+ }
+
+ if (euidaccess("/dev/cpu/0/msr", R_OK)) {
+ WARNING("Turbostat plugin: Collectd cannot open"
+ "/dev/cpu/0/msr. If you don't want to run collectd as "
+ "root, you need to change the ownership (chown) and "
+ "permissions on /dev/cpu/*/msr to allow such access");
+ ret = -1;
+ }
+
+ if (ret != 0)
+ ERROR("Turbostat plugin: Initialization failed: this plugin "
+ "requires collectd to either to run as root or give "
+ "collectd a special capability (CAP_SYS_RAWIO) and read "
+ "access to /dev/cpu/*/msr (see previous warnings)");
+ return ret;
+}
+
+static int
turbostat_init(void)
{
struct stat sb;
return -1;
}
- if (getuid() != 0) {
- ERROR("Turbostat plugin: Initialization failed: this plugin "
- "requires collectd to run as root in order to read "
- "special CPU registers");
- return -1;
- }
+ DO_OR_GOTO_ERR(check_permissions());
DO_OR_GOTO_ERR(probe_cpu());