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Don't go below the low water mark of free pages due to optional prefaulting

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of pages.
PR:		2431
This commit is contained in:
Tor Egge 1998-09-06 23:04:20 +00:00
parent 34d2198035
commit 3bfe64f96a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=38893
2 changed files with 20 additions and 2 deletions
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11
sys/amd64/amd64/pmap.c
View file

@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id: pmap.c,v 1.207 1998/08/23 10:16:25 bde Exp $
* $Id: pmap.c,v 1.208 1998/09/04 13:10:34 ache Exp $
*/
/*
@ -2717,6 +2717,15 @@ pmap_copy(dst_pmap, src_pmap, dst_addr, len, src_addr)
panic("pmap_copy: invalid to pmap_copy page tables\n");
#endif
/*
* Don't let optional prefaulting of pages make us go
* way below the low water mark of free pages or way
* above high water mark of used pv entries.
*/
if (cnt.v_free_count < cnt.v_free_reserved ||
pv_entry_count > pv_entry_high_water)
break;
pdnxt = ((addr + PAGE_SIZE*NPTEPG) & ~(PAGE_SIZE*NPTEPG - 1));
ptepindex = addr >> PDRSHIFT;

11
sys/i386/i386/pmap.c
View file

@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id: pmap.c,v 1.207 1998/08/23 10:16:25 bde Exp $
* $Id: pmap.c,v 1.208 1998/09/04 13:10:34 ache Exp $
*/
/*
@ -2717,6 +2717,15 @@ pmap_copy(dst_pmap, src_pmap, dst_addr, len, src_addr)
panic("pmap_copy: invalid to pmap_copy page tables\n");
#endif
/*
* Don't let optional prefaulting of pages make us go
* way below the low water mark of free pages or way
* above high water mark of used pv entries.
*/
if (cnt.v_free_count < cnt.v_free_reserved ||
pv_entry_count > pv_entry_high_water)
break;
pdnxt = ((addr + PAGE_SIZE*NPTEPG) & ~(PAGE_SIZE*NPTEPG - 1));
ptepindex = addr >> PDRSHIFT;