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SubjectFw: [Lhms-devel] Making hotremovable attribute with memory section[3/4]

Forwarded by Yasunori Goto <ygoto@us.fujitsu.com>
----------------------- Original Message -----------------------
From: Yasunori Goto <ygoto@us.fujitsu.com>
To: lhms-devel@lists.sourceforge.net
Date: Mon, 16 Aug 2004 14:37:05 -0700
Subject: [Lhms-devel] Making hotremovable attribute with memory section[3/4]
----


This patch is define __GFP_HOTREMOVABLE attribute.
Kernel can select attribute removable/un-removable section and allocate
the pages by it.

Note:
The value of __ GFP_HOTREMOVABLE was 0x03 in the definition before.
This was used to make new hot-removable zone_list for same purpose.
This zone_list method had the advantage that the number of steps
of main routes did not increase.
However, all section's removable attributes in a node have to be
same in this method. So, this is meaningless on SMP machine.

Dividing free_area is to be more general way for localized allocation.

---

hotremovable-goto/include/linux/gfp.h | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)

diff -puN include/linux/gfp.h~gfp_hotremovable include/linux/gfp.h
--- hotremovable/include/linux/gfp.h~gfp_hotremovable Fri Aug 13 16:24:38 2004
+++ hotremovable-goto/include/linux/gfp.h Fri Aug 13 16:24:38 2004
@@ -14,7 +14,6 @@ struct vm_area_struct;
/* Zone modifiers in GFP_ZONEMASK (see linux/mmzone.h - low two bits) */
#define __GFP_DMA 0x01
#define __GFP_HIGHMEM 0x02
-
/*
* Action modifiers - doesn't change the zoning
*
@@ -38,6 +37,12 @@ struct vm_area_struct;
#define __GFP_NO_GROW 0x2000 /* Slab internal usage */
#define __GFP_COMP 0x4000 /* Add compound page metadata */

+#ifdef CONFIG_MEMORY_HOTPLUG
+#define __GFP_HOTREMOVABLE 0x8000 /* off: Un-hotremovable, on:Hotremovable */
+#else
+#define __GFP_HOTREMOVABLE 0
+#endif
+
#define __GFP_BITS_SHIFT 16 /* Room for 16 __GFP_FOO bits */
#define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)

@@ -51,7 +56,7 @@ struct vm_area_struct;
#define GFP_NOFS (__GFP_WAIT | __GFP_IO)
#define GFP_KERNEL (__GFP_WAIT | __GFP_IO | __GFP_FS)
#define GFP_USER (__GFP_WAIT | __GFP_IO | __GFP_FS)
-#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM)
+#define GFP_HIGHUSER (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HIGHMEM | __GFP_HOTREMOVABLE)

/* Flag - indicates that the buffer will be suitable for DMA. Ignored on some
platforms, used as appropriate on others */
_
--
Yasunori Goto <ygoto at us.fujitsu.com>




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--------------------- Original Message Ends --------------------
--
Yasunori Goto <ygoto at us.fujitsu.com>


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