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gluon-respondd: add information from /proc/stat to "statistics"

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This commit adds information about:
- how cpu time is spent since boot in jiffies (1/100*sek) (cpu)
    - the value is summed for all cores, so in 10 seconds the
      summed values will increase by 4000, if the cpu has
      4 cores
- context switches since boot (ctxt)
- interrupt counters since boot (intr, softirq)
- forks since boot (processes)

    { "stat": {
       "cpu": {
         "user": 219403,
         "nice": 1714,
         "system": 75159,
         "idle": 2727739,
         "iowait": 2943,
         "irq": 0,
         "softirq": 571
       },
       "intr": 8426340,
       "ctxt": 50992590,
       "processes": 10549,
       "softirq": 5161884
    } }
This commit is contained in:
lemoer 2018-02-24 14:23:23 +01:00 committed by Andreas Ziegler
parent 39c17c6a34
commit 6ac7e97fae
1 changed files with 77 additions and 0 deletions
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77
package/gluon-respondd/src/respondd.c
View File

@ -208,6 +208,82 @@ static struct json_object * get_memory(void) {
return ret;
}
static struct json_object * get_stat(void) {
FILE *f = fopen("/proc/stat", "r");
if (!f)
return NULL;
struct json_object *stat = json_object_new_object();
struct json_object *ret = NULL;
char *line = NULL;
size_t len = 0;
while (getline(&line, &len, f) >= 0) {
char label[32];
if (sscanf(line, "%31s", label) != 1){
goto invalid_stat_format;
}
if (!strcmp(label, "cpu")) {
unsigned long long user, nice, system, idle, iowait, irq, softirq;
if(sscanf(line, "%*s %llu %llu %llu %llu %llu %llu %llu",
&user, &nice, &system, &idle, &iowait, &irq, &softirq) != 7)
goto invalid_stat_format;
struct json_object *cpu = json_object_new_object();
json_object_object_add(cpu, "user", json_object_new_int64(user));
json_object_object_add(cpu, "nice", json_object_new_int64(nice));
json_object_object_add(cpu, "system", json_object_new_int64(system));
json_object_object_add(cpu, "idle", json_object_new_int64(idle));
json_object_object_add(cpu, "iowait", json_object_new_int64(iowait));
json_object_object_add(cpu, "irq", json_object_new_int64(irq));
json_object_object_add(cpu, "softirq", json_object_new_int64(softirq));
json_object_object_add(stat, "cpu", cpu);
} else if (!strcmp(label, "ctxt")) {
unsigned long long ctxt;
if(sscanf(line, "%*s %llu", &ctxt) != 1)
goto invalid_stat_format;
json_object_object_add(stat, "ctxt", json_object_new_int64(ctxt));
} else if (!strcmp(label, "intr")) {
unsigned long long total_intr;
if(sscanf(line, "%*s %llu", &total_intr) != 1)
goto invalid_stat_format;
json_object_object_add(stat, "intr", json_object_new_int64(total_intr));
} else if (!strcmp(label, "softirq")) {
unsigned long long total_softirq;
if(sscanf(line, "%*s %llu", &total_softirq) != 1)
goto invalid_stat_format;
json_object_object_add(stat, "softirq", json_object_new_int64(total_softirq));
} else if (!strcmp(label, "processes")) {
unsigned long long processes;
if(sscanf(line, "%*s %llu", &processes) != 1)
goto invalid_stat_format;
json_object_object_add(stat, "processes", json_object_new_int64(processes));
}
}
ret = stat;
invalid_stat_format:
if (!ret)
json_object_put(stat);
free(line);
fclose(f);
return ret;
}
static struct json_object * get_rootfs_usage(void) {
struct statfs s;
if (statfs("/", &s))
@ -238,6 +314,7 @@ static struct json_object * respondd_provider_statistics(void) {
json_object_object_add(ret, "rootfs_usage", get_rootfs_usage());
json_object_object_add(ret, "memory", get_memory());
json_object_object_add(ret, "stat", get_stat());
add_uptime(ret);
add_loadavg(ret);