linux-kernel - Re: 2.6.25-rc1 xen pvops regression

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Date:	Sun, 17 Feb 2008 23:09:13 +1100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Jody Belka <lists-lkml@...b.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ian Campbell <ijc@...lion.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andi Kleen <andi@...stfloor.org>,
	Mika Penttila <mika.penttila@...umbus.fi>
Subject: Re: 2.6.25-rc1 xen pvops regression

Joel Becker wrote:
>   
>> Unfortunately that doesn't narrow down what the kernel was actually  
>> trying to do at the time.  Clearly a set_pte; looks like someone is  
>> trying to create a writable mapping of an existing pte page.
>>
>> Does "console=hvc0 earlyprintk=xen" on the kernel command line give any  
>> clue about how far it gets before crashing?
>>     
>
>   

I built a kernel using your .config here, but I can't reproduce the 
problem.  It makes it all the way to trying to start init (failed at 
that point because I didn't create an initrd with the xvd module to 
mount /).

> 	Console is already hvc0, but earlyprintk gets us:
>
> --8<-----------------------------------------------------------------
> Reserving virtual address space above 0xf57fe000
> Linux version 2.6.25-rc2-bisectme (jlbec@...build23.us.oracle.com) (gcc
> version 4.1.2 20070626 (Red Hat 4.1.2-14)) #21 SMP Fri Feb 15 16:28:35
> PST 2008
> ACPI in unprivileged domain disabled
> BIOS-provided physical RAM map:
>  Xen: 0000000000000000 - 0000000078000000 (usable)
> console [xenboot0] enabled
> 1192MB HIGHMEM available.
> 727MB LOWMEM available.
> Started domain ca-test58
>                         Scan SMP from c0000000 for 1024 bytes.
> Scan SMP from c009fc00 for 1024 bytes.
> Scan SMP from c00f0000 for 65536 bytes.
> NX (Execute Disable) protection: active
> Zone PFN ranges:
>   DMA             0 ->     4096
>   Normal       4096 ->   186366
>   HighMem    186366 ->   491520
> Movable zone start PFN for each node
> early_node_map[1] active PFN ranges
>     0:        0 ->   491520
> -->8-----------------------------------------------------------------
>
> That's it.
>   

I get:

Entering add_active_range(0, 0, 16384) 0 entries of 256 used
Zone PFN ranges:
  DMA             0 ->     4096
  Normal       4096 ->    16384
  HighMem     16384 ->    16384
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    0:        0 ->    16384
On node 0 totalpages: 16384
  DMA zone: 32 pages used for memmap
  DMA zone: 0 pages reserved
  DMA zone: 4064 pages, LIFO batch:0
  Normal zone: 96 pages used for memmap
  Normal zone: 12192 pages, LIFO batch:1
  HighMem zone: 0 pages used for memmap
  Movable zone: 0 pages used for memmap
...


What happens if you give the domain less memory?

    J
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