svn commit: r251455 - in stable/8/sys: amd64/include arm/include dev/md dev/null i386/include ia64/include mips/include powerpc/include sparc64/include sun4v/include sys vm

Steven Hartland smh at FreeBSD.org
Thu Jun 6 09:13:10 UTC 2013 

Author: smh
Date: Thu Jun  6 09:13:07 2013
New Revision: 251455
URL: http://svnweb.freebsd.org/changeset/base/251455

Log:
  MFC r221855:
  Move the ZERO_REGION_SIZE to a machine-dependent

Modified:
  stable/8/sys/amd64/include/vmparam.h
  stable/8/sys/arm/include/vmparam.h
  stable/8/sys/dev/md/md.c
  stable/8/sys/dev/null/null.c
  stable/8/sys/i386/include/vmparam.h
  stable/8/sys/ia64/include/vmparam.h
  stable/8/sys/mips/include/vmparam.h
  stable/8/sys/powerpc/include/vmparam.h
  stable/8/sys/sparc64/include/vmparam.h
  stable/8/sys/sun4v/include/vmparam.h
  stable/8/sys/sys/systm.h
  stable/8/sys/vm/vm_kern.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/   (props changed)
  stable/8/sys/arm/   (props changed)
  stable/8/sys/dev/   (props changed)
  stable/8/sys/dev/md/   (props changed)
  stable/8/sys/dev/null/   (props changed)
  stable/8/sys/i386/   (props changed)
  stable/8/sys/ia64/   (props changed)
  stable/8/sys/mips/   (props changed)
  stable/8/sys/powerpc/   (props changed)
  stable/8/sys/sparc64/   (props changed)
  stable/8/sys/sun4v/   (props changed)
  stable/8/sys/sys/   (props changed)
  stable/8/sys/vm/   (props changed)

Modified: stable/8/sys/amd64/include/vmparam.h
==============================================================================
--- stable/8/sys/amd64/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/amd64/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -210,4 +210,6 @@
 #define	VM_INITIAL_PAGEIN	16
 #endif
 
+#define	ZERO_REGION_SIZE	(2 * 1024 * 1024)	/* 2MB */
+
 #endif /* _MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/arm/include/vmparam.h
==============================================================================
--- stable/8/sys/arm/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/arm/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -144,4 +144,7 @@
 #ifdef ARM_USE_SMALL_ALLOC
 #define UMA_MD_SMALL_ALLOC
 #endif /* ARM_USE_SMALL_ALLOC */
+
+#define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
+
 #endif	/* _MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/dev/md/md.c
==============================================================================
--- stable/8/sys/dev/md/md.c	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/dev/md/md.c	Thu Jun  6 09:13:07 2013	(r251455)
@@ -89,6 +89,8 @@
 #include <vm/swap_pager.h>
 #include <vm/uma.h>
 
+#include <machine/vmparam.h>
+
 #define MD_MODVER 1
 
 #define MD_SHUTDOWN	0x10000		/* Tell worker thread to terminate. */

Modified: stable/8/sys/dev/null/null.c
==============================================================================
--- stable/8/sys/dev/null/null.c	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/dev/null/null.c	Thu Jun  6 09:13:07 2013	(r251455)
@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/filio.h>
 
 #include <machine/bus.h>
+#include <machine/vmparam.h>
 
 /* For use with destroy_dev(9). */
 static struct cdev *null_dev;

Modified: stable/8/sys/i386/include/vmparam.h
==============================================================================
--- stable/8/sys/i386/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/i386/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -202,4 +202,6 @@
 #define	VM_INITIAL_PAGEIN	16
 #endif
 
+#define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
+
 #endif /* _MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/ia64/include/vmparam.h
==============================================================================
--- stable/8/sys/ia64/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/ia64/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -181,4 +181,6 @@
 #define	VM_INITIAL_PAGEIN	16
 #endif
 
+#define	ZERO_REGION_SIZE	(2 * 1024 * 1024)	/* 2MB */
+
 #endif	/* !_MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/mips/include/vmparam.h
==============================================================================
--- stable/8/sys/mips/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/mips/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -202,4 +202,6 @@
  */
 #define	VM_NFREEORDER		9
 
+#define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
+
 #endif /* !_MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/powerpc/include/vmparam.h
==============================================================================
--- stable/8/sys/powerpc/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/powerpc/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -182,4 +182,6 @@ struct pmap_physseg {
 #define	VM_KMEM_SIZE		(12 * 1024 * 1024)
 #endif
 
+#define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
+
 #endif /* _MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/sparc64/include/vmparam.h
==============================================================================
--- stable/8/sys/sparc64/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/sparc64/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -245,4 +245,11 @@
 extern u_int tsb_kernel_ldd_phys;
 extern vm_offset_t vm_max_kernel_address;
 
+/*
+ * Older sparc64 machines have a virtually indexed L1 data cache of 16KB.
+ * Consequently, mapping the same physical page multiple times may have
+ * caching disabled.
+ */
+#define	ZERO_REGION_SIZE	PAGE_SIZE
+
 #endif /* !_MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/sun4v/include/vmparam.h
==============================================================================
--- stable/8/sys/sun4v/include/vmparam.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/sun4v/include/vmparam.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -227,4 +227,6 @@
 #define	UMA_MD_SMALL_ALLOC
 extern vm_offset_t vm_max_kernel_address;
 
+#define	ZERO_REGION_SIZE	(64 * 1024)	/* 64KB */
+
 #endif /* !_MACHINE_VMPARAM_H_ */

Modified: stable/8/sys/sys/systm.h
==============================================================================
--- stable/8/sys/sys/systm.h	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/sys/systm.h	Thu Jun  6 09:13:07 2013	(r251455)
@@ -137,7 +137,6 @@ extern char static_hints[];	/* by config
 extern char **kenvp;
 
 extern const void *zero_region;	/* address space maps to a zeroed page	*/
-#define	ZERO_REGION_SIZE	(2048 * 1024)
 
 /*
  * General function declarations.

Modified: stable/8/sys/vm/vm_kern.c
==============================================================================
--- stable/8/sys/vm/vm_kern.c	Thu Jun  6 08:57:32 2013	(r251454)
+++ stable/8/sys/vm/vm_kern.c	Thu Jun  6 09:13:07 2013	(r251455)
@@ -525,25 +525,22 @@ kmem_free_wakeup(map, addr, size)
 static void
 kmem_init_zero_region(void)
 {
-	vm_offset_t addr;
+	vm_offset_t addr, i;
 	vm_page_t m;
-	unsigned int i;
 	int error;
 
-	/* Allocate virtual address space. */
+	/*
+	 * Map a single physical page of zeros to a larger virtual range.
+	 * This requires less looping in places that want large amounts of
+	 * zeros, while not using much more physical resources.
+	 */
 	addr = kmem_alloc_nofault(kernel_map, ZERO_REGION_SIZE);
-
-	/* Allocate a page and zero it. */
 	m = vm_page_alloc(NULL, OFF_TO_IDX(addr - VM_MIN_KERNEL_ADDRESS),
 	    VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | VM_ALLOC_ZERO);
 	if ((m->flags & PG_ZERO) == 0)
 		pmap_zero_page(m);
-
-	/* Map the address space to the page. */
 	for (i = 0; i < ZERO_REGION_SIZE; i += PAGE_SIZE)
 		pmap_qenter(addr + i, &m, 1);
-
-	/* Protect it r/o. */
 	error = vm_map_protect(kernel_map, addr, addr + ZERO_REGION_SIZE,
 	    VM_PROT_READ, TRUE);
 	KASSERT(error == 0, ("error=%d", error));

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