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better SMP scheduling

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1649 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2005-11-23 21:01:03 +00:00
parent 8dd69b8f2c
commit 15a7644956
1 changed files with 17 additions and 25 deletions
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42
vl.c
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@ -3682,25 +3682,6 @@ void main_loop_wait(int timeout)
static CPUState *cur_cpu;
static CPUState *find_next_cpu(void)
{
CPUState *env;
env = cur_cpu;
for(;;) {
/* get next cpu */
env = env->next_cpu;
if (!env)
env = first_cpu;
if (!env->cpu_halted)
break;
/* all CPUs are halted ? */
if (env == cur_cpu)
return NULL;
}
cur_cpu = env;
return env;
}
int main_loop(void)
{
int ret, timeout;
@ -3709,13 +3690,24 @@ int main_loop(void)
cur_cpu = first_cpu;
for(;;) {
if (vm_running) {
/* find next cpu to run */
/* XXX: handle HLT correctly */
env = find_next_cpu();
if (!env)
ret = EXCP_HLT;
else
env = cur_cpu;
for(;;) {
/* get next cpu */
env = env->next_cpu;
if (!env)
env = first_cpu;
ret = cpu_exec(env);
if (ret != EXCP_HALTED)
break;
/* all CPUs are halted ? */
if (env == cur_cpu) {
ret = EXCP_HLT;
break;
}
}
cur_cpu = env;
if (shutdown_requested) {
ret = EXCP_INTERRUPT;
break;