From: Tomas Hruby <tom@minix3.org>
Date: Thu, 12 Nov 2009 08:47:25 +0000 (+0000)
Subject: No need for a special idle queue
X-Git-Tag: v3.1.6~204
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doc/syslog.3.html?a=commitdiff_plain;h=cb9faaebfd58299da5cb50585d484ee249b66601;p=minix.git

No need for a special idle queue

- as the idle task is never placed on any run queue, we don't need any special
  idle queue.

- one more queue available for user processes
---

diff --git a/kernel/proc.c b/kernel/proc.c
index e7a04f2aa..02e2c0e48 100644
--- a/kernel/proc.c
+++ b/kernel/proc.c
@@ -1198,7 +1198,6 @@ register struct proc *rp;	/* this process is now runnable */
   sched(rp, &q, &front);
 
   vmassert(q >= 0);
-  vmassert(q < IDLE_Q || rp->p_endpoint == IDLE);
 
   /* Now add the process to the queue. */
   if (rdy_head[q] == NIL_PROC) {		/* add to empty queue */
@@ -1262,7 +1261,6 @@ PRIVATE void enqueue_head(struct proc *rp)
   vmassert(rp->p_ticks_left);
 
   vmassert(q >= 0);
-  vmassert(q < IDLE_Q || rp->p_endpoint == IDLE);
 
   q = rp->p_priority;
 
@@ -1358,7 +1356,7 @@ int *front;					/* return: front or back */
    */
   if (! time_left) {				/* quantum consumed ? */
       rp->p_ticks_left = rp->p_quantum_size; 	/* give new quantum */
-      if (rp->p_priority < (IDLE_Q-1)) {  	 
+      if (rp->p_priority < (NR_SCHED_QUEUES-1)) {
           rp->p_priority += 1;			/* lower priority */
       }
   }
diff --git a/kernel/proc.h b/kernel/proc.h
index 6cb26900a..69f1124c9 100644
--- a/kernel/proc.h
+++ b/kernel/proc.h
@@ -223,9 +223,10 @@ struct proc {
 #define NR_SCHED_QUEUES   16	/* MUST equal minimum priority + 1 */
 #define TASK_Q		   0	/* highest, used for kernel tasks */
 #define MAX_USER_Q  	   0    /* highest priority for user processes */   
-#define USER_Q  	   7    /* default (should correspond to nice 0) */   
-#define MIN_USER_Q	  14	/* minimum priority for user processes */
-#define IDLE_Q		  15    /* lowest, only IDLE process goes here */
+#define USER_Q  	  (NR_SCHED_QUEUES / 2) /* default (should correspond to
+						   nice 0) */
+#define MIN_USER_Q	  (NR_SCHED_QUEUES - 1)	/* minimum priority for user
+						   processes */
 
 /* Magic process table addresses. */
 #define BEG_PROC_ADDR (&proc[0])
diff --git a/kernel/table.c b/kernel/table.c
index 73c19d6ff..7d068f521 100644
--- a/kernel/table.c
+++ b/kernel/table.c
@@ -120,7 +120,7 @@ PRIVATE int
 
 PUBLIC struct boot_image image[] = {
 /* process nr, pc,flags, qs,  queue, stack, traps, ipcto, call,  name */ 
-{IDLE,       NULL,IDL_F,  0, IDLE_Q, IDL_S,     0,     0, no_c,"idle"  },
+{IDLE,       NULL,IDL_F,  0,      0, IDL_S,     0,     0, no_c,"idle"  },
 {CLOCK,clock_task,TSK_F,  8, TASK_Q, TSK_S, TSK_T,     0, no_c,"clock" },
 {SYSTEM, sys_task,TSK_F,  8, TASK_Q, TSK_S, TSK_T,     0, no_c,"system"},
 {HARDWARE,      0,TSK_F,  8, TASK_Q, HRD_S,     0,     0, no_c,"kernel"},