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Complete r251452:

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Avoid to busy/unbusy a page in cases where there is no need to drop the
vm_obj lock, more nominally when the page is full valid after
vm_page_grab().

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc
This commit is contained in:
attilio 2013-06-06 18:19:26 +00:00
parent 190d5ac85b
commit 3b60ec551b
2 changed files with 7 additions and 4 deletions
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5
sys/vm/swap_pager.c
View File

@ -1706,18 +1706,19 @@ swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
vm_page_t m;
vm_object_pip_add(object, 1);
m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL|VM_ALLOC_RETRY);
m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
VM_ALLOC_NOBUSY);
if (m->valid == VM_PAGE_BITS_ALL) {
vm_object_pip_subtract(object, 1);
vm_page_dirty(m);
vm_page_lock(m);
vm_page_activate(m);
vm_page_unlock(m);
vm_page_wakeup(m);
vm_pager_page_unswapped(m);
return;
}
vm_page_busy(m);
if (swap_pager_getpages(object, &m, 1, 0) != VM_PAGER_OK)
panic("swap_pager_force_pagein: read from swap failed");/*XXX*/
vm_object_pip_subtract(object, 1);

6
sys/vm/vm_glue.c
View File

@ -241,8 +241,10 @@ vm_imgact_hold_page(vm_object_t object, vm_ooffset_t offset)
VM_OBJECT_WLOCK(object);
pindex = OFF_TO_IDX(offset);
m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
VM_ALLOC_NOBUSY);
if (m->valid != VM_PAGE_BITS_ALL) {
vm_page_busy(m);
ma[0] = m;
rv = vm_pager_get_pages(object, ma, 1, 0);
m = vm_page_lookup(object, pindex);
@ -255,11 +257,11 @@ vm_imgact_hold_page(vm_object_t object, vm_ooffset_t offset)
m = NULL;
goto out;
}
vm_page_wakeup(m);
}
vm_page_lock(m);
vm_page_hold(m);
vm_page_unlock(m);
vm_page_wakeup(m);
out:
VM_OBJECT_WUNLOCK(object);
return (m);