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Code Issues Releases Activity

Fix a problem with the page coloring code that the system will not always

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be able to use all of the free pages.  This can manifest as a panic
using DIAGNOSTIC, or as a panic on an indirect memory reference.
This commit is contained in:
John Dyson 1996-10-06 18:27:39 +00:00
parent 8607faf466
commit f7d6dab2fd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=18768
1 changed files with 7 additions and 3 deletions
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10
sys/vm/vm_page.c
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@ -34,7 +34,7 @@
* SUCH DAMAGE.
*
* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
* $Id: vm_page.c,v 1.65 1996/09/28 03:33:35 dyson Exp $
* $Id: vm_page.c,v 1.66 1996/09/28 17:53:18 bde Exp $
*/
/*
@ -601,7 +601,7 @@ vm_page_list_find(basequeue, index)
for(j = 0; j < PQ_L1_SIZE; j++) {
for(i = (PQ_L2_SIZE/2) - (PQ_L1_SIZE - 1);
i > 0;
i >= 0;
i -= PQ_L1_SIZE) {
hindex = (index + (i+j)) & PQ_L2_MASK;
m = TAILQ_FIRST(vm_page_queues[basequeue + hindex].pl);
@ -690,7 +690,7 @@ vm_page_select_free(object, pindex, prefqueue)
*/
for(j = 0; j < PQ_L1_SIZE; j++) {
for(i = (PQ_L2_SIZE/2) - (PQ_L1_SIZE - 1);
(i + j) > 0;
(i + j) >= 0;
i -= PQ_L1_SIZE) {
hindex = prefqueue + ((index + (i+j)) & PQ_L2_MASK);
@ -823,6 +823,10 @@ vm_page_alloc(object, pindex, page_req)
case VM_ALLOC_INTERRUPT:
if (cnt.v_free_count > 0) {
m = vm_page_select_free(object, pindex, PQ_FREE);
#if defined(DIAGNOSTIC)
if (m == NULL)
panic("vm_page_alloc(INTERRUPT): missing page on free queue\n");
#endif
} else {
splx(s);
pagedaemon_wakeup();