Re: [Xen-ia64-devel] [PATCH][RFC]discontig memory support

[Alex Williamson <alex.williamson@xxxxxx>]

On Mon, 2006-04-03 at 21:31 +0900, Kouya SHIMURA wrote:
> Hi xen/ia64 developers.
> 
> The attached patch supports discontiguous memory. 
> It also makes over 4GB memory available.
> Please comment and review.

Hi Kouya,

   Nice work.  I agree with Kevin, let's start with the easier solution
and work towards SPARSEMEM if we determine it's better.  I see it's on
your todo list, but documenting the performance difference will also be
important for evaluating future changes.

   I tried this patch on a zx1 system.  Unfortunately I'm still not able
to use all of the memory.  The system has 10GB of memory with the
following memory address space: 0-1GB, 4-10GB, 257-260GB.  On current
xen-ia64-unstable tip, I'm able to use the memory in the first two
address spaces by passing xen the option max_addr=10G (of course I only
get 7GB of usable memory).  If I apply this patch and remove the
max_addr option, I get the boot log below.  This system has a fairly
sparse layout, but newer and bigger systems have even larger and more
sparse layouts.  Thanks,

        Alex

-- 
Alex Williamson                             HP Linux & Open Source Lab

(XEN) Console output is synchronous.
(XEN) xen image pstart: 0x4000000, xenheap pend: 0x8000000
(XEN) efi.trim_top: ignoring 4KB of memory at 0x0 due to granule hole at 0x0
(XEN) efi.trim_top: ignoring 636KB of memory at 0x1000 due to granule hole at 
0x0
(XEN) efi.trim_bottom: ignoring 15360KB of memory at 0x100000 due to granule 
hole at 0x0
(XEN) ready to move Dom0 to 0x8000000 with len e20168...ready to move initrd to 
0x8e24000 with len 0...Done
(XEN) find_memory: efi_memmap_walk returns max_page=103fff0
(XEN) find_memory: last granule reserved for dom0; xen max_page=103f800
(XEN) Before heap_start: f000000004102370
(XEN) After heap_start: f00000000430c000
(XEN) Init boot pages: 0x1000000 -> 0x4000000.
(XEN) Init boot pages: 0x8000000 -> 0x3f5e4000.
(XEN) Init boot pages: 0x3fb00000 -> 0x3fb2c000.
(XEN) Init boot pages: 0x100000000 -> 0x27fffc000.
(XEN) Init boot pages: 0x4040000000 -> 0x40fdf7c008.
(XEN) Init boot pages: 0x40fdf7c068 -> 0x40fdf7ff9e.
(XEN) Init boot pages: 0x40fdf7ffd2 -> 0x40fef9a008.
(XEN) Init boot pages: 0x40fef9a7e8 -> 0x40ffd68000.
(XEN) Init boot pages: 0x40ffda8000 -> 0x40ffe10000.
(XEN) Init boot pages: 0x40ffe80000 -> 0x40fffc0000.
(XEN) System RAM: 10213MB (10458224kB)
(XEN) size of virtual frame_table: 25616kB
(XEN) alloc_dom0: starting (initializing 512 MB...)
(XEN) alloc_dom0: dom0_start=0x8000000
(XEN) Xen heap: 60MB (62416kB)
(XEN) About to call scheduler_init()
(XEN) Using scheduler: Simple EDF Scheduler (sedf)
(XEN) ACPI: RSDP (v002     HP                                ) @ 
0x000000003fb2e000
(XEN) ACPI: XSDT (v001     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb2e02c
(XEN) ACPI: FADT (v003     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb369e0
(XEN) ACPI: SPCR (v001     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb36b18
(XEN) ACPI: DBGP (v001     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb36b68
(XEN) ACPI: MADT (v001     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb36c28
(XEN) ACPI: SPMI (v004     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb36ba0
(XEN) ACPI: CPEP (v001     HP   zx6000 0x00000000 HP 0x00000000) @ 
0x000000003fb36bf0
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb33870
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb33a50
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb33da0
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb347c0
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb351e0
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb35c00
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb36620
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb36800
(XEN) ACPI: SSDT (v001     HP   zx6000 0x00000006 INTL 0x02012044) @ 
0x000000003fb368f0
(XEN) ACPI: DSDT (v001     HP   zx6000 0x00000007 INTL 0x02012044) @ 
0x0000000000000000
(XEN) SAL 3.1: HP version 2.31
(XEN) SAL Platform features: None
(XEN) SAL: AP wakeup using external interrupt vector 0xff
(XEN) No logical to physical processor mapping available
(XEN) avail:0x1180c60000000000, 
status:0x60000000000,control:0x1180c00000000000, vm?0x0
(XEN) No VT feature supported.
(XEN) cpu_init: current=f0000000040b4000, 
current->domain->arch.mm=0000000000000000
(XEN) vhpt_init: vhpt size=0x1000000, align=0x1000000
(XEN) vhpt_init: vhpt paddr=0x27e000000, end=0x27effffff
(XEN) ACPI: Local APIC address e8000000fee00000
(XEN) ACPI: LAPIC_ADDR_OVR (address[00000000fee00000])
(XEN) ACPI: LSAPIC (acpi_id[0x00] lsapic_id[0x00] lsapic_eid[0x00] enabled)
(XEN) CPU 0 (0x0000) enabled (BSP)
(XEN) ACPI: LSAPIC (acpi_id[0x01] lsapic_id[0x01] lsapic_eid[0x00] enabled)
(XEN) CPU 1 (0x0100) enabled
(XEN) ACPI: IOSAPIC (id[0x0] address[00000000fed20800] gsi_base[16])
(XEN) ACPI: IOSAPIC (id[0x1] address[00000000fed22800] gsi_base[27])
(XEN) ACPI: IOSAPIC (id[0x2] address[00000000fed24800] gsi_base[38])
(XEN) ACPI: IOSAPIC (id[0x3] address[00000000fed26800] gsi_base[49])
(XEN) ACPI: [APIC:0x06] ignored 3 entries of 7 found
(XEN) 2 CPUs available, 2 CPUs total
(XEN) ia64_mca_init() skipped (Machine check abort handling)
(XEN) Cannot handle page request order 14!
(XEN) 
(XEN) ****************************************
(XEN) Panic on CPU 0:
(XEN) Not enough memory to bootstrap Xen.
(XEN) ****************************************
(XEN) 
(XEN) Reboot in five seconds...
(XEN) machine_restart called: spinning....



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