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pmap_is_modified(): If we fall into the slow path and encounter a modified 

page during PV list walk, set PG_M in the pvh_attrs to avoid falling into
the slow path again.
This commit is contained in:
thorpej 2023-12-22 19:14:57 +00:00
parent 33d45195d8
commit e4d4f6035b
1 changed files with 3 additions and 2 deletions
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5
sys/arch/vax/vax/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.200 2023/12/22 17:55:49 thorpej Exp $ */
/* $NetBSD: pmap.c,v 1.201 2023/12/22 19:14:57 thorpej Exp $ */
/*
* Copyright (c) 1994, 1998, 1999, 2003 Ludd, University of Lule}, Sweden.
* All rights reserved.
@ -25,7 +25,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.200 2023/12/22 17:55:49 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.201 2023/12/22 19:14:57 thorpej Exp $");
#include "opt_cputype.h"
#include "opt_ddb.h"
@ -1474,6 +1474,7 @@ pmap_is_modified(struct vm_page *pg)
if (pte[0].pg_m | pte[1].pg_m | pte[2].pg_m | pte[3].pg_m
| pte[4].pg_m | pte[5].pg_m | pte[6].pg_m | pte[7].pg_m) {
rv = true;
SET(pv->pv_attr, PG_M);
break;
}
} while ((pv = pv->pv_next) != NULL);