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Take a more conservative approach and still lock Giant around VM faults

Browse source 
for now.
This commit is contained in:
John Baldwin 2001-05-23 22:09:18 +00:00
parent 1b2555b243
commit 576f0c5fa4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77077
1 changed files with 6 additions and 8 deletions
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14
sys/vm/vm_fault.c
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@ -138,6 +138,7 @@ _unlock_things(struct faultstate *fs, int dealloc)
{
mtx_assert(&vm_mtx, MA_OWNED);
mtx_assert(&Giant, MA_OWNED);
vm_object_pip_wakeup(fs->object);
if (fs->object != fs->first_object) {
vm_page_free(fs->first_m);
@ -154,9 +155,7 @@ _unlock_things(struct faultstate *fs, int dealloc)
vp = fs->vp;
fs->vp = NULL;
mtx_unlock(&vm_mtx);
mtx_lock(&Giant);
vput(vp);
mtx_unlock(&Giant);
mtx_lock(&vm_mtx);
}
}
@ -207,18 +206,21 @@ int
vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
int fault_flags)
{
int hadvmlock, ret;
int hadvmlock, hadgiant, ret;
hadvmlock = mtx_owned(&vm_mtx);
hadgiant = mtx_owned(&Giant);
mtx_lock(&Giant);
if (!hadvmlock) {
mtx_lock(&vm_mtx);
vm_faults_no_vm_mtx++;
if (!mtx_owned(&Giant))
if (hadgiant == 0)
vm_faults_no_giant++;
}
ret = vm_fault1(map, vaddr, fault_type, fault_flags);
if (!hadvmlock)
mtx_unlock(&vm_mtx);
mtx_unlock(&Giant);
return (ret);
}
@ -295,9 +297,7 @@ RetryFault:;
vm_object_pip_add(fs.first_object, 1);
mtx_unlock(&vm_mtx);
mtx_lock(&Giant);
fs.vp = vnode_pager_lock(fs.first_object);
mtx_unlock(&Giant);
mtx_lock(&vm_mtx);
if ((fault_type & VM_PROT_WRITE) &&
(fs.first_object->type == OBJT_VNODE)) {
@ -771,9 +771,7 @@ RetryFault:;
if (fs.vp != NULL) {
mtx_unlock(&vm_mtx);
mtx_lock(&Giant);
vput(fs.vp);
mtx_unlock(&Giant);
mtx_lock(&vm_mtx);
fs.vp = NULL;
}