Module Name: src
Committed By: rin
Date: Fri Feb 21 13:16:16 UTC 2020
Modified Files:
src/sys/arch/powerpc/ibm4xx: pmap.c
Log Message:
In ppc4xx_tlb_find_victim(), mark kernel stack page TLBF_REF instead of
TLBF_USED. This should be originally intended behavior of this code
segment, because
- TLBF_USED is already checked just before, so marking this page
TLBF_USED is no-op.
- TLBF_REF flag exempts that page from being flushed from TLB in next
scan, when kernel stack may be still there with high probability.
To generate a diff of this commit:
cvs rdiff -u -r1.79 -r1.80 src/sys/arch/powerpc/ibm4xx/pmap.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/powerpc/ibm4xx/pmap.c
diff -u src/sys/arch/powerpc/ibm4xx/pmap.c:1.79 src/sys/arch/powerpc/ibm4xx/pmap.c:1.80
--- src/sys/arch/powerpc/ibm4xx/pmap.c:1.79 Thu Feb 20 05:34:37 2020
+++ src/sys/arch/powerpc/ibm4xx/pmap.c Fri Feb 21 13:16:16 2020
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.79 2020/02/20 05:34:37 rin Exp $ */
+/* $NetBSD: pmap.c,v 1.80 2020/02/21 13:16:16 rin Exp $ */
/*
* Copyright 2001 Wasabi Systems, Inc.
@@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.79 2020/02/20 05:34:37 rin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.80 2020/02/21 13:16:16 rin Exp $");
#include <sys/param.h>
#include <sys/cpu.h>
@@ -1276,7 +1276,7 @@ ppc4xx_tlb_find_victim(void)
(tlb_info[tlbnext].ti_ctx == KERNEL_PID) &&
(flags & TLBF_USED)) {
/* Kernel stack page */
- flags |= TLBF_USED;
+ flags |= TLBF_REF;
tlb_info[tlbnext].ti_flags = flags;
} else {
/* Found it! */
