sched: changed thread time slices

src/include/kernel/sched.h

@@ -14,9 +14,8 @@
 #include <kernel/syscalls.h>
 #include <kernel/io.h>
 
-// ideal number of context switches per second
 // still not sure of how to decide on this value so it'll probably change
-#define SCHED_SWITCH_RATE       200
+#define SCHED_TIME_SLICE        1       // ms
 
 #define MAX_PID                 99999
 
@@ -26,9 +25,9 @@
 #define THREAD_ZOMBIE           3
 #define THREAD_SLEEP            4
 
-#define PRIORITY_HIGH           0
-#define PRIORITY_NORMAL         1
-#define PRIORITY_LOW            2
+#define PRIORITY_LOW            1
+#define PRIORITY_NORMAL         2
+#define PRIORITY_HIGH           3
 
 typedef struct Thread {
     int status, cpu, priority;

src/sched/sched.c

@@ -473,15 +473,8 @@ int threadUseContext(pid_t tid) {
  */
 
 uint64_t schedTimeslice(Thread *t, int p) {
-    /* todo: actually interpret the priority value */
-    uint64_t schedTime = PLATFORM_TIMER_FREQUENCY / SCHED_SWITCH_RATE;
-
-    int cpus = platformCountCPU();
-    uint64_t time = schedTime / threads;
-    if(time < 6) time = 6;      // minimum threshold
-    time *= cpus;
-    if(time < 12) time = 12;
-
+    if(!p) p = PRIORITY_NORMAL;
+    uint64_t time = p * SCHED_TIME_SLICE;
     t->priority = p;
     return time;
 }