| 589 | } |
| 590 | |
| 591 | void |
| 592 | faultin(struct proc *p) |
| 593 | { |
| 594 | struct thread *td; |
| 595 | int oom_alloc; |
| 596 | |
| 597 | PROC_LOCK_ASSERT(p, MA_OWNED); |
| 598 | |
| 599 | /* |
| 600 | * If another process is swapping in this process, |
| 601 | * just wait until it finishes. |
| 602 | */ |
| 603 | if (p->p_flag & P_SWAPPINGIN) { |
| 604 | while (p->p_flag & P_SWAPPINGIN) |
| 605 | msleep(&p->p_flag, &p->p_mtx, PVM, "faultin", 0); |
| 606 | return; |
| 607 | } |
| 608 | |
| 609 | if ((p->p_flag & P_INMEM) == 0) { |
| 610 | oom_alloc = (p->p_flag & P_WKILLED) != 0 ? VM_ALLOC_SYSTEM : |
| 611 | VM_ALLOC_NORMAL; |
| 612 | |
| 613 | /* |
| 614 | * Don't let another thread swap process p out while we are |
| 615 | * busy swapping it in. |
| 616 | */ |
| 617 | ++p->p_lock; |
| 618 | p->p_flag |= P_SWAPPINGIN; |
| 619 | PROC_UNLOCK(p); |
| 620 | sx_xlock(&allproc_lock); |
| 621 | MPASS(swapped_cnt > 0); |
| 622 | swapped_cnt--; |
| 623 | if (curthread != &thread0) |
| 624 | swap_inprogress++; |
| 625 | sx_xunlock(&allproc_lock); |
| 626 | |
| 627 | /* |
| 628 | * We hold no lock here because the list of threads |
| 629 | * can not change while all threads in the process are |
| 630 | * swapped out. |
| 631 | */ |
| 632 | FOREACH_THREAD_IN_PROC(p, td) |
| 633 | vm_thread_swapin(td, oom_alloc); |
| 634 | |
| 635 | if (curthread != &thread0) { |
| 636 | sx_xlock(&allproc_lock); |
| 637 | MPASS(swap_inprogress > 0); |
| 638 | swap_inprogress--; |
| 639 | last_swapin = ticks; |
| 640 | sx_xunlock(&allproc_lock); |
| 641 | } |
| 642 | PROC_LOCK(p); |
| 643 | swapclear(p); |
| 644 | p->p_swtick = ticks; |
| 645 | |
| 646 | /* Allow other threads to swap p out now. */ |
| 647 | wakeup(&p->p_flag); |
| 648 | --p->p_lock; |
no test coverage detected