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Support running with inadequate swap space. Additionally, the code

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will complain with a suggestion of increasing it.
This commit is contained in:
John Dyson 1997-12-24 15:05:25 +00:00
parent 5ebfa8de69
commit b44e4b7a2b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=31970
2 changed files with 16 additions and 8 deletions
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20
sys/vm/swap_pager.c
View File

@ -39,7 +39,7 @@
* from: Utah $Hdr: swap_pager.c 1.4 91/04/30$
*
* @(#)swap_pager.c 8.9 (Berkeley) 3/21/94
* $Id: swap_pager.c,v 1.78 1997/09/01 03:17:13 bde Exp $
* $Id: swap_pager.c,v 1.79 1997/12/02 21:07:19 phk Exp $
*/
/*
@ -75,10 +75,11 @@
static int nswiodone;
int swap_pager_full;
extern int vm_swap_size;
static int suggest_more_swap = 0;
static int no_swap_space = 1;
struct rlisthdr swaplist;
#define MAX_PAGEOUT_CLUSTER 16
#define MAX_PAGEOUT_CLUSTER 8
TAILQ_HEAD(swpclean, swpagerclean);
@ -377,7 +378,14 @@ swap_pager_getswapspace(object, amount, rtval)
daddr_t *rtval;
{
unsigned location;
vm_swap_size -= amount;
if (!suggest_more_swap && (vm_swap_size < btodb(cnt.v_page_count * PAGE_SIZE))) {
printf("swap_pager: suggest more swap space: %d MB\n",
(2 * cnt.v_page_count * (PAGE_SIZE / 1024)) / 1000);
suggest_more_swap = 1;
}
if (!rlist_alloc(&swaplist, amount, &location)) {
vm_swap_size += amount;
return 0;
@ -1121,11 +1129,13 @@ swap_pager_getpages(object, m, count, reqpage)
* must set the dirty bits so that the page contents
* will be preserved.
*/
if (SWAPLOW) {
if (SWAPLOW ||
(vm_swap_size < btodb((cnt.v_page_count - cnt.v_wire_count)) * PAGE_SIZE)) {
for (i = 0; i < count; i++) {
m[i]->dirty = VM_PAGE_BITS_ALL;
}
swap_pager_freespace(object, m[0]->pindex + paging_offset, count);
swap_pager_freespace(object,
m[0]->pindex + paging_offset, count);
}
} else {
swap_pager_ridpages(m, count, reqpage);
@ -1621,9 +1631,7 @@ swap_pager_iodone(bp)
if (bp->b_vp)
pbrelvp(bp);
/*
if (bp->b_flags & B_WANTED)
*/
wakeup(bp);
if (bp->b_rcred != NOCRED)

4
sys/vm/vm_pageout.c
View File

@ -65,7 +65,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_pageout.c,v 1.102 1997/12/05 05:41:06 dyson Exp $
* $Id: vm_pageout.c,v 1.103 1997/12/06 02:23:33 dyson Exp $
*/
/*
@ -190,7 +190,7 @@ SYSCTL_INT(_vm, OID_AUTO, max_page_launder,
CTLFLAG_RW, &max_page_launder, 0, "");
#define VM_PAGEOUT_PAGE_COUNT 16
#define VM_PAGEOUT_PAGE_COUNT 8
int vm_pageout_page_count = VM_PAGEOUT_PAGE_COUNT;
int vm_page_max_wired; /* XXX max # of wired pages system-wide */