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Rewrite of process scheduling:

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- current and maximum priority per process;
- quantum size and current ticks left per process;
- max number of full quantums in a row allow
  (otherwise current priority is decremented)
This commit is contained in:
Jorrit Herder
2005-06-30 15:55:19 +00:00
parent ebd38d9a92
commit bac6068857
15 changed files with 235 additions and 177 deletions
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kernel/main.c
+17 -12
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@@ -39,7 +39,7 @@ PUBLIC void main()
vir_clicks text_clicks;
vir_clicks data_clicks;
reg_t ktsb; /* kernel task stack base */
struct system_image *ttp;
struct system_image *ip; /* boot image pointer */
struct exec e_hdr; /* for a copy of an a.out header */
/* Initialize the interrupt controller. */
@@ -49,7 +49,7 @@ PUBLIC void main()
* for proc_addr() and proc_nr() macros.
*/
for (rp = BEG_PROC_ADDR, i = -NR_TASKS; rp < END_PROC_ADDR; ++rp, ++i) {
rp->p_flags = SLOT_FREE; /* initialize free slot */
rp->p_rts_flags = SLOT_FREE; /* initialize free slot */
rp->p_nr = i; /* proc number from ptr */
(pproc_addr + NR_TASKS)[i] = rp; /* proc ptr from number */
}
@@ -66,19 +66,24 @@ PUBLIC void main()
ktsb = (reg_t) t_stack;
for (i=0; i < IMAGE_SIZE; ++i) {
ttp = &image[i]; /* t's task attributes */
rp = proc_addr(ttp->proc_nr); /* t's process slot */
kstrncpy(rp->p_name, ttp->proc_name, P_NAME_LEN); /* set name */
ip = &image[i]; /* t's task attributes */
rp = proc_addr(ip->proc_nr); /* t's process slot */
kstrncpy(rp->p_name, ip->proc_name, P_NAME_LEN); /* set name */
rp->p_name[P_NAME_LEN-1] = '\0'; /* just for safety */
rp->p_priority = ttp->priority; /* scheduling priority */
rp->p_call_mask = ttp->call_mask; /* allowed system calls */
rp->p_sendmask = ttp->sendmask; /* sendmask protection */
rp->p_flags = ip->flags; /* process flags */
rp->p_max_priority = ip->priority; /* max scheduling priority */
rp->p_priority = ip->priority; /* current priority */
rp->p_quantum_size = ip->quantum; /* quantum size in ticks */
rp->p_sched_ticks = ip->quantum; /* current credit */
rp->p_full_quantums = QUANTUMS(ip->priority); /* quantums left */
rp->p_call_mask = ip->call_mask; /* allowed system calls */
rp->p_sendmask = ip->sendmask; /* sendmask protection */
if (i-NR_TASKS < 0) { /* part of the kernel? */
if (ttp->stksize > 0) { /* HARDWARE stack size is 0 */
if (ip->stksize > 0) { /* HARDWARE stack size is 0 */
rp->p_stguard = (reg_t *) ktsb;
*rp->p_stguard = STACK_GUARD;
}
ktsb += ttp->stksize; /* point to high end of stack */
ktsb += ip->stksize; /* point to high end of stack */
rp->p_reg.sp = ktsb; /* this task's initial stack ptr */
text_base = kinfo.code_base >> CLICK_SHIFT;
/* processes that are in the kernel */
@@ -108,7 +113,7 @@ PUBLIC void main()
* is different from that of other processes because tasks can
* access I/O; this is not allowed to less-privileged processes
*/
rp->p_reg.pc = (reg_t) ttp->initial_pc;
rp->p_reg.pc = (reg_t) ip->initial_pc;
rp->p_reg.psw = (iskernelp(rp)) ? INIT_TASK_PSW : INIT_PSW;
/* Initialize the server stack pointer. Take it down one word
@@ -125,7 +130,7 @@ PUBLIC void main()
rp->p_ready = 0;
#endif
if (rp->p_nr != HARDWARE) lock_ready(rp);
rp->p_flags = 0;
rp->p_rts_flags = 0;
/* Code and data segments must be allocated in protected mode. */
alloc_segments(rp);