[Xen-ia64-devel] [RFC] Change .config of dom0 for

[Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>]

Hi, Isaku and all

When I boot dom0 with dom0_mem=31G, dom0 use about 2GB memory after booting.
I check why dom0 use 2GB, then I found the following message at the boot time.

 Aperture:     64 megabytes
 Kernel range: 0xe0000000052b4000 - 0xe0000000092b4000
 Address size: 30 bits
Memory: 30649984k/32456704k available (10480k code, 1805472k reserved, 4361k 
data, 288k init) <------- !!!reserved 1.8GB!!!
McKinley Errata 9 workaround not needed; disabling it

So I check the rsvd_memory, but rsvd_region is no problem.
rsvd_region[0]=1480     (0xe000000000002228 - 0xe0000000000027f0)
rsvd_region[1]=96       (0xe000000001000000 - 0xe000000001000060)
rsvd_region[2]=18344456 (0xe000000004000000 - 0xe00000000517ea08)
rsvd_region[3]=16384    (0xe000000005180000 - 0xe000000005184000)
rsvd_region[4]=66       (0xe000000005180080 - 0xe0000000051800c2)
rsvd_region[5]=80       (0xe000000005180480 - 0xe0000000051804d0)
rsvd_region[6]=1305615  (0xe000000005184000 - 0xe0000000052c2c0f)
rsvd_region[7]=0        (0xffffffffffffffff - 0xffffffffffffffff)

Because Isaku's dom0 patches change dom0's memory map from contiguous memory 
to discontiguous memory, I change .config of dom0 like the below,
then I can get the following message and dom0 don't use 2GB.

# diff -uNrp buildconfigs/linux-defconfig_xen_ia64 build-linux-2.6.16.33-
xen_ia64/.config  
--- buildconfigs/linux-defconfig_xen_ia64       2007-01-17 07:21:06.000000000 +
0900
+++ build-linux-2.6.16.33-xen_ia64/.config      2007-01-17 20:22:11.000000000 +
0900
@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
-# Linux kernel version: 2.6.16.29-xen
-# Tue Nov 14 10:38:50 2006
+# Linux kernel version: 2.6.16.33-xen
+# Wed Jan 17 20:22:11 2007
 #
 
 #
@@ -125,18 +125,23 @@ CONFIG_ARCH_ENABLE_MEMORY_HOTPLUG=y
 # CONFIG_SCHED_SMT is not set
 # CONFIG_PREEMPT is not set
 CONFIG_SELECT_MEMORY_MODEL=y
-CONFIG_FLATMEM_MANUAL=y
-# CONFIG_DISCONTIGMEM_MANUAL is not set
+# CONFIG_FLATMEM_MANUAL is not set
+CONFIG_DISCONTIGMEM_MANUAL=y
 # CONFIG_SPARSEMEM_MANUAL is not set
-CONFIG_FLATMEM=y
+CONFIG_DISCONTIGMEM=y
 CONFIG_FLAT_NODE_MEM_MAP=y
+CONFIG_NEED_MULTIPLE_NODES=y
 # CONFIG_SPARSEMEM_STATIC is not set
 CONFIG_SPLIT_PTLOCK_CPUS=4
+CONFIG_MIGRATION=y
 CONFIG_ARCH_SELECT_MEMORY_MODEL=y
 CONFIG_ARCH_DISCONTIGMEM_ENABLE=y
 CONFIG_ARCH_FLATMEM_ENABLE=y
 CONFIG_ARCH_SPARSEMEM_ENABLE=y
-# CONFIG_VIRTUAL_MEM_MAP is not set
+CONFIG_NUMA=y
+CONFIG_VIRTUAL_MEM_MAP=y
+CONFIG_HOLES_IN_ZONE=y
+CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID=y
 # CONFIG_IA32_SUPPORT is not set
 CONFIG_IA64_MCA_RECOVERY=y
 CONFIG_PERFMON=y
@@ -166,6 +171,7 @@ CONFIG_ACPI_FAN=y
 CONFIG_ACPI_PROCESSOR=y
 CONFIG_ACPI_HOTPLUG_CPU=y
 CONFIG_ACPI_THERMAL=y
+CONFIG_ACPI_NUMA=y
 CONFIG_ACPI_BLACKLIST_YEAR=0
 # CONFIG_ACPI_DEBUG is not set
 CONFIG_ACPI_EC=y
@@ -1522,7 +1528,6 @@ CONFIG_HAVE_ARCH_ALLOC_SKB=y
 CONFIG_HAVE_ARCH_DEV_ALLOC_SKB=y
 CONFIG_XEN_BALLOON=y
 CONFIG_XEN_SKBUFF=y
-# CONFIG_XEN_DEVMEM is not set
 CONFIG_XEN_REBOOT=y
 # CONFIG_XEN_SMPBOOT is not set
 CONFIG_XEN_INTERFACE_VERSION=0x00030203
@@ -1558,3 +1563,4 @@ CONFIG_XEN_COMPAT_030002_AND_LATER=y
 CONFIG_XEN_COMPAT_030002=y
 CONFIG_HAVE_IRQ_IGNORE_UNHANDLED=y
 CONFIG_NO_IDLE_HZ=y
+CONFIG_XEN_DEVMEM=y


Should we change .config of dom0?
Or should we fix other code?

I think we should change .confing,
I use CONFIG_DISCONTIGMEM and CONFIG_VIRTUAL_MEM_MAP,
but we may use SPARSEMEM.
(I'll check SPARSEMEM soon.)

Please comment.

Best Regards,

Akio Takebe


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