svn commit: r205582 - in stable/8/sys: amd64/amd64 i386/i386

[Konstantin Belousov]

Author: kib
Date: Wed Mar 24 09:45:17 2010
New Revision: 205582
URL: http://svn.freebsd.org/changeset/base/205582

Log:
  MFC r204957:
  Fall back to wbinvd when region for CLFLUSH is >= 2MB.
  
  MFC r205334 (by avg):
  Fix a typo in a comment.

Modified:
  stable/8/sys/amd64/amd64/pmap.c
  stable/8/sys/i386/i386/pmap.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)
  stable/8/sys/net/   (props changed)
  stable/8/sys/netinet/ipfw/   (props changed)

Modified: stable/8/sys/amd64/amd64/pmap.c
==============================================================================
--- stable/8/sys/amd64/amd64/pmap.c	Wed Mar 24 09:27:12 2010	(r205581)
+++ stable/8/sys/amd64/amd64/pmap.c	Wed Mar 24 09:45:17 2010	(r205582)
@@ -941,7 +941,8 @@ pmap_invalidate_cache_range(vm_offset_t 
 
 	if (cpu_feature & CPUID_SS)
 		; /* If "Self Snoop" is supported, do nothing. */
-	else if (cpu_feature & CPUID_CLFSH) {
+	else if ((cpu_feature & CPUID_CLFSH) != 0 &&
+		 eva - sva < 2 * 1024 * 1024) {
 
 		/*
 		 * Otherwise, do per-cache line flush.  Use the mfence
@@ -958,7 +959,8 @@ pmap_invalidate_cache_range(vm_offset_t 
 
 		/*
 		 * No targeted cache flush methods are supported by CPU,
-		 * globally invalidate cache as a last resort.
+		 * or the supplied range is bigger than 2MB.
+		 * Globally invalidate cache.
 		 */
 		pmap_invalidate_cache();
 	}

Modified: stable/8/sys/i386/i386/pmap.c
==============================================================================
--- stable/8/sys/i386/i386/pmap.c	Wed Mar 24 09:27:12 2010	(r205581)
+++ stable/8/sys/i386/i386/pmap.c	Wed Mar 24 09:45:17 2010	(r205582)
@@ -982,7 +982,8 @@ pmap_invalidate_cache_range(vm_offset_t 
 
 	if (cpu_feature & CPUID_SS)
 		; /* If "Self Snoop" is supported, do nothing. */
-	else if (cpu_feature & CPUID_CLFSH) {
+	else if ((cpu_feature & CPUID_CLFSH) != 0 &&
+		 eva - sva < 2 * 1024 * 1024) {
 
 		/*
 		 * Otherwise, do per-cache line flush.  Use the mfence
@@ -999,7 +1000,8 @@ pmap_invalidate_cache_range(vm_offset_t 
 
 		/*
 		 * No targeted cache flush methods are supported by CPU,
-		 * globally invalidate cache as a last resort.
+		 * or the supplied range is bigger than 2MB.
+		 * Globally invalidate cache.
 		 */
 		pmap_invalidate_cache();
 	}