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

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

[Yasunori Goto]

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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