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Make pmap_collect() a NOP -- due to the way we deal with the four-level pte,

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invalidating the entire address space results in multi-minute system hangs.

Okay'ed by fvdl@
This commit is contained in:
sekiya 2004-05-31 13:42:27 +00:00
parent 2f3bdc714c
commit 4ae860025d
1 changed files with 8 additions and 2 deletions
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10
sys/arch/amd64/amd64/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.9 2004/02/19 17:18:38 drochner Exp $ */
/* $NetBSD: pmap.c,v 1.10 2004/05/31 13:42:27 sekiya Exp $ */
/*
*
@ -108,7 +108,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.9 2004/02/19 17:18:38 drochner Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.10 2004/05/31 13:42:27 sekiya Exp $");
#ifndef __x86_64__
#include "opt_cputype.h"
@ -3087,6 +3087,11 @@ void
pmap_collect(pmap)
struct pmap *pmap;
{
/* Because of the multiple page table levels, this will cause a system
* pause lasting up to three minutes while scanning for valid PTEs.
* Since it is an optional function, disable for now.
*/
#if 0
/*
* free all of the pt pages by removing the physical mappings
* for its entire address space.
@ -3094,6 +3099,7 @@ pmap_collect(pmap)
pmap_do_remove(pmap, VM_MIN_ADDRESS, VM_MAX_ADDRESS,
PMAP_REMOVE_SKIPWIRED);
#endif
}
/*