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Change pmap_emulate_reference() so that it only touches the vm_page

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flags if it is safe to do so, otherwise it will just alter the pmap state
(eg, clear the appropriate PG_FOx bits).

This gets alpha booting in the face of the vm_mtx introduction.

Reviewed by: dfr
This commit is contained in:
Andrew Gallatin 2001-05-21 16:09:29 +00:00
parent 2ee7c91e2e
commit 08eceb4f4b
1 changed files with 9 additions and 1 deletions
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10
sys/alpha/alpha/pmap.c
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@ -2830,6 +2830,7 @@ pmap_emulate_reference(struct proc *p, vm_offset_t v, int user, int write)
pt_entry_t faultoff, *pte;
vm_offset_t pa;
vm_page_t m;
int user_addr;
/*
* Convert process and virtual address to physical address.
@ -2838,10 +2839,12 @@ pmap_emulate_reference(struct proc *p, vm_offset_t v, int user, int write)
if (user)
panic("pmap_emulate_reference: user ref to kernel");
pte = vtopte(v);
user_addr = 0;
} else {
KASSERT(p != NULL, ("pmap_emulate_reference: bad proc"));
KASSERT(p->p_vmspace != NULL, ("pmap_emulate_reference: bad p_vmspace"));
pte = pmap_lev3pte(p->p_vmspace->vm_map.pmap, v);
user_addr = 1;
}
#ifdef DEBUG /* These checks are more expensive */
if (!pmap_pte_v(pte))
@ -2883,7 +2886,12 @@ pmap_emulate_reference(struct proc *p, vm_offset_t v, int user, int write)
m = PHYS_TO_VM_PAGE(pa);
m->md.pv_flags |= PV_TABLE_REF;
faultoff = PG_FOR | PG_FOE;
vm_page_flag_set(m, PG_REFERENCED);
if (user_addr && mtx_trylock(&vm_mtx)) {
vm_page_flag_set(m, PG_REFERENCED);
mtx_unlock(&vm_mtx);
}
if (write) {
m->md.pv_flags |= PV_TABLE_MOD;
vm_page_dirty(m);