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terminate(): do not iterate process hash if no children processes exist

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This commit is contained in:
Balazs Gerofi
2017-06-08 14:53:57 +09:00
parent 5758dba7cf
commit 66fad4c7a4
2 changed files with 40 additions and 38 deletions
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76
kernel/syscall.c
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@ -811,48 +811,50 @@ terminate(int rc, int sig)
kfree(ids);
}
// clean up children
for(i = 0; i < HASH_SIZE; i++){
mcs_rwlock_writer_lock(&resource_set->process_hash->lock[i],
&lock);
list_for_each_entry_safe(child, next,
&resource_set->process_hash->list[i],
hash_list){
mcs_rwlock_writer_lock_noirq(&child->update_lock,
&updatelock);
if(child->ppid_parent == proc &&
child->status == PS_ZOMBIE){
list_del(&child->hash_list);
list_del(&child->siblings_list);
kfree(child);
}
else if(child->ppid_parent == proc){
mcs_rwlock_writer_lock_noirq(&proc->children_lock,
&childlock);
mcs_rwlock_writer_lock_noirq(&pid1->children_lock,
&childlock1);
child->ppid_parent = pid1;
if(child->parent == proc){
child->parent = pid1;
if (!list_empty(&proc->children_list)) {
// clean up children
for(i = 0; i < HASH_SIZE; i++){
mcs_rwlock_writer_lock(&resource_set->process_hash->lock[i],
&lock);
list_for_each_entry_safe(child, next,
&resource_set->process_hash->list[i],
hash_list){
mcs_rwlock_writer_lock_noirq(&child->update_lock,
&updatelock);
if(child->ppid_parent == proc &&
child->status == PS_ZOMBIE){
list_del(&child->hash_list);
list_del(&child->siblings_list);
list_add_tail(&child->siblings_list,
&pid1->children_list);
kfree(child);
}
else{
list_del(&child->ptraced_siblings_list);
list_add_tail(&child->ptraced_siblings_list,
&pid1->ptraced_children_list);
else if(child->ppid_parent == proc){
mcs_rwlock_writer_lock_noirq(&proc->children_lock,
&childlock);
mcs_rwlock_writer_lock_noirq(&pid1->children_lock,
&childlock1);
child->ppid_parent = pid1;
if(child->parent == proc){
child->parent = pid1;
list_del(&child->siblings_list);
list_add_tail(&child->siblings_list,
&pid1->children_list);
}
else{
list_del(&child->ptraced_siblings_list);
list_add_tail(&child->ptraced_siblings_list,
&pid1->ptraced_children_list);
}
mcs_rwlock_writer_unlock_noirq(&pid1->children_lock,
&childlock1);
mcs_rwlock_writer_unlock_noirq(&proc->children_lock,
&childlock);
}
mcs_rwlock_writer_unlock_noirq(&pid1->children_lock,
&childlock1);
mcs_rwlock_writer_unlock_noirq(&proc->children_lock,
&childlock);
mcs_rwlock_writer_unlock_noirq(&child->update_lock,
&updatelock);
}
mcs_rwlock_writer_unlock_noirq(&child->update_lock,
&updatelock);
mcs_rwlock_writer_unlock(&resource_set->process_hash->lock[i],
&lock);
}
mcs_rwlock_writer_unlock(&resource_set->process_hash->lock[i],
&lock);
}
dkprintf("terminate,pid=%d\n", proc->pid);