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User-space scheduling for system processes

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This commit is contained in:
Erik van der Kouwe
2010-07-01 08:32:33 +00:00
parent b17e3adb60
commit 23284ee7bd
40 changed files with 490 additions and 1166 deletions
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10
kernel/system/do_fork.c
View File

@@ -86,14 +86,8 @@ PUBLIC int do_fork(struct proc * caller, message * m_ptr)
rpc->p_virt_left = 0; /* disable, clear the process-virtual timers */
rpc->p_prof_left = 0;
/*
* if the child process inherited a scheduler, the child process is not
* runnable until it's scheduled. Otherwise the default kernel policy applies.
* This is only the case of system servers, drivers and similar sensitive
* processes
*/
if (rpc->p_scheduler)
RTS_SET(rpc, RTS_NO_QUANTUM);
/* the child process is not runnable until it's scheduled. */
RTS_SET(rpc, RTS_NO_QUANTUM);
make_zero64(rpc->p_cpu_time_left);
make_zero64(rpc->p_cycles);

24
kernel/system/do_schedctl.c
View File

@@ -7,17 +7,37 @@
PUBLIC int do_schedctl(struct proc * caller, message * m_ptr)
{
struct proc *p;
unsigned flags;
int proc_nr;
/* Only system processes can change process schedulers */
if (! (priv(caller)->s_flags & SYS_PROC))
return(EPERM);
if (!isokendpt(m_ptr->SCHEDULING_ENDPOINT, &proc_nr))
/* check parameter validity */
flags = (unsigned) m_ptr->SCHEDCTL_FLAGS;
if (flags & ~SCHEDCTL_FLAG_KERNEL) {
printf("do_schedctl: flags 0x%x invalid, caller=%d\n",
flags, caller - proc);
return EINVAL;
}
if (!isokendpt(m_ptr->SCHEDCTL_ENDPOINT, &proc_nr))
return EINVAL;
p = proc_addr(proc_nr);
p->p_scheduler = caller;
if ((flags & SCHEDCTL_FLAG_KERNEL) == SCHEDCTL_FLAG_KERNEL) {
/* the kernel becomes the scheduler and starts
* scheduling the process; RTS_NO_QUANTUM which was
* previously set by sys_fork is removed
*/
p->p_scheduler = NULL;
RTS_UNSET(p, RTS_NO_QUANTUM);
} else {
/* the caller becomes the scheduler */
p->p_scheduler = caller;
}
return(OK);
}