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Code Issues Releases Activity

Eliminate some unnecessary uses of the vm page queues lock around the

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vm page's valid field.  This field is being synchronized using the
containing vm object's lock.
This commit is contained in:
Alan Cox 2003-10-04 22:47:20 +00:00
parent 272487f507
commit 6ec2fca505
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=120769
2 changed files with 6 additions and 11 deletions
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15
sys/kern/kern_exec.c
View File

@ -744,23 +744,19 @@ exec_map_first_page(imgp)
VOP_GETVOBJECT(imgp->vp, &object);
VM_OBJECT_LOCK(object);
ma[0] = vm_page_grab(object, 0, VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
vm_page_lock_queues();
if ((ma[0]->valid & VM_PAGE_BITS_ALL) != VM_PAGE_BITS_ALL) {
vm_page_unlock_queues();
initial_pagein = VM_INITIAL_PAGEIN;
if (initial_pagein > object->size)
initial_pagein = object->size;
for (i = 1; i < initial_pagein; i++) {
if ((ma[i] = vm_page_lookup(object, i)) != NULL) {
if (ma[i]->valid)
break;
vm_page_lock_queues();
if ((ma[i]->flags & PG_BUSY) || ma[i]->busy) {
vm_page_unlock_queues();
break;
}
if (ma[i]->valid) {
vm_page_unlock_queues();
break;
}
vm_page_busy(ma[i]);
vm_page_unlock_queues();
} else {
@ -773,22 +769,23 @@ exec_map_first_page(imgp)
initial_pagein = i;
rv = vm_pager_get_pages(object, ma, initial_pagein, 0);
ma[0] = vm_page_lookup(object, 0);
vm_page_lock_queues();
if ((rv != VM_PAGER_OK) || (ma[0] == NULL) ||
(ma[0]->valid == 0)) {
if (ma[0]) {
vm_page_lock_queues();
pmap_remove_all(ma[0]);
vm_page_free(ma[0]);
vm_page_unlock_queues();
}
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(object);
return (EIO);
}
}
VM_OBJECT_UNLOCK(object);
vm_page_lock_queues();
vm_page_wire(ma[0]);
vm_page_wakeup(ma[0]);
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(object);
pmap_qenter((vm_offset_t)imgp->image_header, ma, 1);
imgp->firstpage = ma[0];

2
sys/kern/vfs_bio.c
View File

@ -3591,9 +3591,7 @@ vm_hold_load_pages(struct buf * bp, vm_offset_t from, vm_offset_t to)
VM_OBJECT_LOCK(kernel_object);
goto tryagain;
}
vm_page_lock_queues();
p->valid = VM_PAGE_BITS_ALL;
vm_page_unlock_queues();
pmap_qenter(pg, &p, 1);
bp->b_pages[index] = p;
vm_page_lock_queues();