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Make pmap_collect() actually do something useful. If called with a user

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pmap, forget all of the mappings for the user address space for that pmap.
This causes the PT pages to be freed so that they can be reclaimed by the
VM system. [*]

[*] Actually, in the current implementation, it merely causes the wiring
count on the PT pages to drop to 0, which allows them to be reclaimed by
the pagedaemon.  Handling of PT pages needs to be completely rewritten.
This commit is contained in:
thorpej 1998-12-21 09:02:43 +00:00
parent d6bc370c2d
commit 795321b030
1 changed files with 23 additions and 14 deletions
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37
sys/arch/hp300/hp300/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.59 1998/12/21 08:51:39 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.60 1998/12/21 09:02:43 thorpej Exp $ */
/*
* Copyright (c) 1991, 1993
@ -1645,27 +1645,36 @@ pmap_update()
* collected.
*
* Called by the pageout daemon when pages are scarce.
*
* Note: THIS IMPLEMENTATION IS BOGUS! When we're called, the
* process using this pmap is about to be swapped out! So, we
* should free all of the page tables being used by that process!
*/
void
pmap_collect(pmap)
pmap_t pmap;
{
int bank, s;
if (pmap != pmap_kernel())
return;
PMAP_DPRINTF(PDB_FOLLOW, ("pmap_collect(%p)\n", pmap));
s = splimp();
for (bank = 0; bank < vm_nphysseg; bank++)
pmap_collect1(pmap, ptoa(vm_physmem[bank].start),
ptoa(vm_physmem[bank].end));
splx(s);
if (pmap == pmap_kernel()) {
int bank, s;
/*
* XXX This is very bogus. We should handle kernel PT
* XXX pages much differently.
*/
s = splimp();
for (bank = 0; bank < vm_nphysseg; bank++)
pmap_collect1(pmap, ptoa(vm_physmem[bank].start),
ptoa(vm_physmem[bank].end));
splx(s);
} else {
/*
* This process is about to be swapped out; free all of
* the PT pages by removing the physical mappings for its
* entire address space. Note: pmap_remove() performs
* all necessary locking.
*/
pmap_remove(pmap, VM_MIN_ADDRESS, VM_MAX_ADDRESS);
}
#ifdef notyet
/* Go compact and garbage-collect the pv_table. */