Add api to get per cpu usage

Updated /proc/stat to be compatible with Linux's implementation.

fs/proc/root.c

@@ -15,8 +15,30 @@ static int proc_show_version(struct proc_entry *UNUSED(entry), struct proc_data
 }
 
 static int proc_show_stat(struct proc_entry *UNUSED(entry), struct proc_data *buf) {
-    struct cpu_usage usage = get_cpu_usage();
-    proc_printf(buf, "cpu  %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64"\n", usage.user_ticks, usage.nice_ticks, usage.system_ticks, usage.idle_ticks);
+    int ncpus = get_cpu_count();
+    struct cpu_usage total_usage = get_total_cpu_usage();
+    struct cpu_usage* per_cpu_usage = 0;
+    struct uptime_info uptime_info = get_uptime();
+    unsigned uptime = uptime_info.uptime_ticks;
+
+    proc_printf(buf, "cpu  %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64" 0 0 0 0\n", total_usage.user_ticks, total_usage.nice_ticks, total_usage.system_ticks, total_usage.idle_ticks);
+
+    int err = get_per_cpu_usage(&per_cpu_usage);
+    if (!err) {
+        for (int i = 0; i < ncpus; i++) {
+            proc_printf(buf, "cpu%d  %"PRIu64" %"PRIu64" %"PRIu64" %"PRIu64" 0 0 0 0\n", i, per_cpu_usage[i].user_ticks, per_cpu_usage[i].nice_ticks, per_cpu_usage[i].system_ticks, per_cpu_usage[i].idle_ticks);
+        }
+        free(per_cpu_usage);
+    }
+
+    int blocked_task_count = get_count_of_blocked_tasks();
+    int alive_task_count = get_count_of_alive_tasks();
+    proc_printf(buf, "ctxt 0\n");
+    proc_printf(buf, "btime %u\n", uptime);
+    proc_printf(buf, "processes %d\n", alive_task_count);
+    proc_printf(buf, "procs_running %d\n", alive_task_count - blocked_task_count);
+    proc_printf(buf, "procs_blocked %d\n", blocked_task_count);
+
     return 0;
 }
 

platform/darwin.c

@@ -1,9 +1,12 @@
+#include <errno.h>
 #include <mach/mach.h>
 #include <sys/sysctl.h>
 #include <sys/time.h>
+#include <sys/mman.h>
 #include "platform/platform.h"
+#include "debug.h"
 
-struct cpu_usage get_cpu_usage() {
+struct cpu_usage get_total_cpu_usage() {
     host_cpu_load_info_data_t load;
     mach_msg_type_number_t fuck = HOST_CPU_LOAD_INFO_COUNT;
     host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO, (host_info_t) &load, &fuck);
@@ -68,3 +71,35 @@ int get_cpu_count() {
     sysctlbyname("hw.ncpu", &ncpu, &size, NULL, 0);
     return ncpu;
 }
+
+int get_per_cpu_usage(struct cpu_usage** cpus_usage) {
+    mach_msg_type_number_t info_size = sizeof(processor_cpu_load_info_t);
+    processor_cpu_load_info_t sys_load_data = 0;
+    natural_t ncpu;
+
+    int err = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &ncpu, (processor_info_array_t*)&sys_load_data, &info_size);
+    if (err) {
+        STRACE("Unable to get per cpu usage");
+        return err;
+    }
+
+    struct cpu_usage* cpus_load_data = (struct cpu_usage*)calloc(ncpu, sizeof(struct cpu_usage));
+    if (!cpus_load_data) {
+        return -ENOMEM;
+    }
+
+    for (natural_t i = 0; i < ncpu; i++) {
+        cpus_load_data[i].user_ticks = sys_load_data[i].cpu_ticks[CPU_STATE_USER];
+        cpus_load_data[i].system_ticks = sys_load_data[i].cpu_ticks[CPU_STATE_SYSTEM];
+        cpus_load_data[i].idle_ticks = sys_load_data[i].cpu_ticks[CPU_STATE_IDLE];
+        cpus_load_data[i].nice_ticks = sys_load_data[i].cpu_ticks[CPU_STATE_NICE];
+    }
+    *cpus_usage = cpus_load_data;
+
+    // Freeing cpu load information
+    if (sys_load_data) {
+        munmap(sys_load_data, vm_page_size);
+    }
+
+    return 0;
+}

platform/linux.c

@@ -1,6 +1,8 @@
+#include <errno.h>
 #include <sys/sysinfo.h>
 #include <inttypes.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
 #include "platform/platform.h"
 #include "debug.h"
@@ -16,7 +18,7 @@ static void read_proc_line(const char *file, const char *name, char *buf) {
     fclose(f);
 }
 
-struct cpu_usage get_cpu_usage() {
+struct cpu_usage get_total_cpu_usage() {
     struct cpu_usage usage = {};
     char buf[1234];
     read_proc_line("/proc/stat", "cpu", buf);
@@ -55,3 +57,27 @@ struct uptime_info get_uptime() {
 int get_cpu_count() {
     return get_nprocs();
 }
+
+int get_per_cpu_usage(struct cpu_usage** cpus_usage) {
+    char buf[1234];
+    char cpu_title[8];
+    int ncpu = get_cpu_count();
+    struct cpu_usage* cpus_load_data = (struct cpu_usage*)calloc(ncpu, sizeof(struct cpu_usage));
+    if (!cpus_load_data) {
+        return -ENOMEM;
+    }
+
+    for (int i = 0; i < ncpu; i++) {
+        int cpu_num;
+        int title_len = snprintf(cpu_title, 8, "cpu%d", i);
+        if (title_len > 8 || title_len < 0) {
+            STRACE("Can't load info of cpu %d (>10000)", i);
+            free(cpus_load_data);
+            return -ENOMEM;
+        }
+        read_proc_line("/proc/stat", cpu_title, buf);
+        sscanf(buf, "cpu%d %"SCNu64" %"SCNu64" %"SCNu64" %"SCNu64"\n", &cpu_num, &cpus_load_data[i].user_ticks, &cpus_load_data[i].system_ticks, &cpus_load_data[i].idle_ticks, &cpus_load_data[i].nice_ticks);
+    }
+    *cpus_usage = cpus_load_data;
+    return 0;
+}

platform/platform.h

@@ -9,7 +9,8 @@ struct cpu_usage {
     uint64_t idle_ticks;
     uint64_t nice_ticks;
 };
-struct cpu_usage get_cpu_usage(void);
+struct cpu_usage get_total_cpu_usage(void);
+int get_per_cpu_usage(struct cpu_usage** cpus_usage);
 
 struct mem_usage {
     uint64_t total;