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When considering a page for deactivation, check to see if the 

page has been referenced since the last time it was considered.
If it was, don't deactivate the page.
This commit is contained in:
thorpej 2001-01-25 00:24:48 +00:00
parent 91a4c18e32
commit 37247109d1
1 changed files with 6 additions and 4 deletions
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10
sys/uvm/uvm_pdaemon.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: uvm_pdaemon.c,v 1.27 2001/01/25 00:10:03 mycroft Exp $ */
/* $NetBSD: uvm_pdaemon.c,v 1.28 2001/01/25 00:24:48 thorpej Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -1098,11 +1098,13 @@ uvmpd_scan()
}
/*
* deactivate this page if there's a shortage of
* inactive pages.
* If the page has not been referenced since the
* last scan, deactivate the page if there is a
* shortage of inactive pages.
*/
if (inactive_shortage > 0) {
if (inactive_shortage > 0 &&
pmap_clear_reference(p) == FALSE) {
pmap_page_protect(p, VM_PROT_NONE);
/* no need to check wire_count as pg is "active" */
uvm_pagedeactivate(p);