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When doing kstack swapin, read as much pages in one run as possible.

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Suggested and reviewed by:	alc (previous version)
Tested by:	pho
MFC after:	2 weeks
This commit is contained in:
kib 2010-04-29 09:59:16 +00:00
parent b1ef5079fa
commit 8ec6fa6b8c
1 changed files with 25 additions and 11 deletions
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36
sys/vm/vm_glue.c
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@ -538,23 +538,37 @@ static void
vm_thread_swapin(struct thread *td)
{
vm_object_t ksobj;
vm_page_t m, ma[KSTACK_MAX_PAGES];
int i, pages, rv;
vm_page_t ma[KSTACK_MAX_PAGES];
int i, j, k, pages, rv;
pages = td->td_kstack_pages;
ksobj = td->td_kstack_obj;
VM_OBJECT_LOCK(ksobj);
for (i = 0; i < pages; i++) {
m = vm_page_grab(ksobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
for (i = 0; i < pages; i++)
ma[i] = vm_page_grab(ksobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
VM_ALLOC_WIRED);
if (m->valid != VM_PAGE_BITS_ALL) {
rv = vm_pager_get_pages(ksobj, &m, 1, 0);
for (i = 0; i < pages; i++) {
if (ma[i]->valid != VM_PAGE_BITS_ALL) {
KASSERT(ma[i]->oflags & VPO_BUSY,
("lost busy 1"));
vm_object_pip_add(ksobj, 1);
for (j = i + 1; j < pages; j++) {
KASSERT(ma[j]->valid == VM_PAGE_BITS_ALL ||
(ma[j]->oflags & VPO_BUSY),
("lost busy 2"));
if (ma[j]->valid == VM_PAGE_BITS_ALL)
break;
}
rv = vm_pager_get_pages(ksobj, ma + i, j - i, 0);
if (rv != VM_PAGER_OK)
panic("vm_thread_swapin: cannot get kstack for proc: %d", td->td_proc->p_pid);
m = vm_page_lookup(ksobj, i);
}
ma[i] = m;
vm_page_wakeup(m);
panic("vm_thread_swapin: cannot get kstack for proc: %d",
td->td_proc->p_pid);
vm_object_pip_wakeup(ksobj);
for (k = i; k < j; k++)
ma[k] = vm_page_lookup(ksobj, k);
vm_page_wakeup(ma[i]);
} else if (ma[i]->oflags & VPO_BUSY)
vm_page_wakeup(ma[i]);
}
VM_OBJECT_UNLOCK(ksobj);
pmap_qenter(td->td_kstack, ma, pages);