Module Name: src
Committed By: reinoud
Date: Tue Jan 10 12:07:18 UTC 2012
Modified Files:
src/sys/arch/usermode/usermode: pmap.c
Log Message:
Use thunk_madvise() on the memory space hinting the kernel we are using it in
a random order and hint the kernel that we we need the memory.i
No measured effect on a memory file on tmpfs /tmp though.
To generate a diff of this commit:
cvs rdiff -u -r1.100 -r1.101 src/sys/arch/usermode/usermode/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/usermode/usermode/pmap.c
diff -u src/sys/arch/usermode/usermode/pmap.c:1.100 src/sys/arch/usermode/usermode/pmap.c:1.101
--- src/sys/arch/usermode/usermode/pmap.c:1.100 Tue Jan 10 10:09:49 2012
+++ src/sys/arch/usermode/usermode/pmap.c Tue Jan 10 12:07:17 2012
@@ -1,4 +1,4 @@
-/* $NetBSD: pmap.c,v 1.100 2012/01/10 10:09:49 reinoud Exp $ */
+/* $NetBSD: pmap.c,v 1.101 2012/01/10 12:07:17 reinoud Exp $ */
/*-
* Copyright (c) 2011 Reinoud Zandijk <[email protected]>
@@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.100 2012/01/10 10:09:49 reinoud Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pmap.c,v 1.101 2012/01/10 12:07:17 reinoud Exp $");
#include "opt_memsize.h"
#include "opt_kmempages.h"
@@ -255,6 +255,13 @@ pmap_bootstrap(void)
THUNK_PROT_READ | THUNK_PROT_EXEC);
assert(err == 0);
+ /* madvise the host kernel about our intentions with the memory */
+ /* no measured effect, but might make a difference on high load */
+ err = thunk_madvise((void *) kmem_user_start,
+ kmem_k_start - kmem_user_start,
+ THUNK_MADV_WILLNEED | THUNK_MADV_RANDOM);
+ assert(err == 0);
+
/* initialize counters */
fpos = 0;
free_start = fpos; /* in physical space ! */
