Re: 2.6.25-rc1 xen pvops regression

[Jeremy Fitzhardinge]

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@xxxxxxxxxxxxxxxxxxxxxxxx) (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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