Implement scaling for cpu_freq

[slstatus.git] / components / cpu.c

diff --git a/components/cpu.c b/components/cpu.c
index 661c27c..2e910d9 100644 (file)
--- a/components/cpu.c
+++ b/components/cpu.c
@@ -6,52 +6,32 @@
 #include "../util.h"
 
 #if defined(__linux__)
-       const char *
-       cpu_freq(void)
-       {
-               int freq;
-
-               return (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
-                              "%i", &freq) == 1) ?
-                      bprintf("%d", (freq + 500) / 1000) : NULL;
-       }
+       #include <inttypes.h>
+       #include <stdint.h>
 
        const char *
-       cpu_perc(void)
+       cpu_freq(void)
        {
-               int perc;
-               static long double a[7];
-               static int valid;
-               long double b[7];
+               uint64_t freq;
 
-               memcpy(b, a, sizeof(b));
-               /* cpu user nice system idle iowait irq softirq */
-               if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
-                          &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
-                       return NULL;
-               }
-               if (!valid) {
-                       valid = 1;
+               /* in kHz */
+               if (pscanf("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq",
+                           "%"SCNu64, &freq) != 1) {
                        return NULL;
                }
 
-               perc = 100 * ((b[0] + b[1] + b[2] + b[5] + b[6]) -
-                             (a[0] + a[1] + a[2] + a[5] + a[6])) /
-                            ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
-                             (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]));
-
-               return bprintf("%d", perc);
+               return fmt_human_10(freq * 1000, "Hz");
        }
 
        const char *
-       cpu_iowait(void)
+       cpu_perc(void)
        {
-               int perc;
                static int valid;
                static long double a[7];
                long double b[7];
 
                memcpy(b, a, sizeof(b));
+               /* cpu user nice system idle iowait irq softirq */
                if (pscanf("/proc/stat", "%*s %Lf %Lf %Lf %Lf %Lf %Lf %Lf",
                           &a[0], &a[1], &a[2], &a[3], &a[4], &a[5], &a[6]) != 7) {
                        return NULL;
@@ -61,11 +41,11 @@
                        return NULL;
                }
 
-               perc = 100 * ((b[4]) - (a[4])) /
-                      ((b[0]+b[1]+b[2]+b[3]+b[4]+b[5]+b[6]) -
-                       (a[0]+a[1]+a[2]+a[3]+a[4]+a[5]+a[6]));
-
-               return bprintf("%d", perc);
+               return bprintf("%d%%", (int)(100 *
+                              ((b[0] + b[1] + b[2] + b[5] + b[6]) -
+                               (a[0] + a[1] + a[2] + a[5] + a[6])) /
+                              ((b[0] + b[1] + b[2] + b[3] + b[4] + b[5] + b[6]) -
+                               (a[0] + a[1] + a[2] + a[3] + a[4] + a[5] + a[6]))));
        }
 #elif defined(__OpenBSD__)
        #include <sys/param.h>
@@ -83,19 +63,19 @@
 
                size = sizeof(freq);
 
-               if (sysctl(mib, 2, &freq, &size, NULL, 0) == -1) {
-                       fprintf(stderr, "sysctl 'HW_CPUSPEED': %s\n",
-                               strerror(errno));
+               /* in MHz */
+               if (sysctl(mib, 2, &freq, &size, NULL, 0) < 0) {
+                       warn("sysctl 'HW_CPUSPEED':");
                        return NULL;
                }
 
-               return bprintf("%d", freq);
+               return fmt_human_10((size_t)freq * 1000 * 1000, "Hz");
        }
 
        const char *
        cpu_perc(void)
        {
-               int mib[2], perc;
+               int mib[2];
                static int valid;
                static long int a[CPUSTATES];
                long int b[CPUSTATES];
@@ -107,8 +87,8 @@
                size = sizeof(a);
 
                memcpy(b, a, sizeof(b));
-               if (sysctl(mib, 2, &a, &size, NULL, 0) == -1) {
-                       fprintf(stderr, "sysctl 'KERN_CPTIME': %s\n", strerror(errno));
+               if (sysctl(mib, 2, &a, &size, NULL, 0) < 0) {
+                       warn("sysctl 'KERN_CPTIME':");
                        return NULL;
                }
                if (!valid) {
@@ -116,12 +96,12 @@
                        return NULL;
                }
 
-               perc = 100 *
-                     ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
-                      (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
-                     ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] + a[CP_IDLE]) -
-                      (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] + b[CP_IDLE]));
-
-               return bprintf("%d", perc);
+               return bprintf("%d%%", 100 *
+                              ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR]) -
+                               (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR])) /
+                              ((a[CP_USER] + a[CP_NICE] + a[CP_SYS] + a[CP_INTR] +
+                                a[CP_IDLE]) -
+                               (b[CP_USER] + b[CP_NICE] + b[CP_SYS] + b[CP_INTR] +
+                                b[CP_IDLE])));
        }
 #endif