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do_migrate(): don't clear oversubscribed source CPUs from remote TLB mask

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This commit is contained in:
Balazs Gerofi
2017-05-17 11:15:31 +09:00
parent a968c935b5
commit eaa4d35fab
1 changed files with 24 additions and 5 deletions
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29
kernel/process.c
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@ -2745,6 +2745,8 @@ static void do_migrate(void)
int cpu_id;
int old_cpu_id;
struct cpu_local_var *v;
struct thread *thread;
int clear_old_cpu = 1;
/* 0. check if migration is necessary */
list_del(&req->list);
@ -2769,11 +2771,28 @@ static void do_migrate(void)
req->thread->cpu_id = cpu_id;
list_add_tail(&req->thread->sched_list, &v->runq);
v->runq_len += 1;
/* update cpu_set of the VM for remote TLB invalidation */
cpu_clear_and_set(old_cpu_id, cpu_id,
&req->thread->vm->address_space->cpu_set,
&req->thread->vm->address_space->cpu_set_lock);
/* Find out whether there is another thread of the same process
* on the source CPU */
list_for_each_entry(thread, &(cur_v->runq), sched_list) {
if (thread->vm && thread->vm == req->thread->vm) {
clear_old_cpu = 0;
break;
}
}
/* Update cpu_set of the VM for remote TLB invalidation */
if (clear_old_cpu) {
cpu_clear_and_set(old_cpu_id, cpu_id,
&req->thread->vm->address_space->cpu_set,
&req->thread->vm->address_space->cpu_set_lock);
}
else {
cpu_set(cpu_id,
&req->thread->vm->address_space->cpu_set,
&req->thread->vm->address_space->cpu_set_lock);
}
dkprintf("%s: migrated TID %d from CPU %d to CPU %d\n",
__FUNCTION__, req->thread->tid, old_cpu_id, cpu_id);