Re: [Qemu-devel] Kernel Panic on Yum update

[Paolo Bonzini]

On 15/05/2015 09:37, Gerhard Wiesinger wrote:
>>
> 
> Yes, yum takes memory. But there is ~2.2 GB virt memory available. That
> should be enough. Therefore I think it is a kernel problem. As in
> previous crashes on the mailing list there is a lot of swap available
> (2GB) which isn't touched in ANY way.
> 
> Under normal conditions without yum:
> free
>               total        used        free      shared buff/cache  
> available
> Mem:         243036      132540       12716       15520 97780       74964
> Swap:       2064380           0     2064380

Not all memory is the same.  Some memory cannot be swapped, and some
memory can be swapped to disk without a swap file (e.g. executables).

Failing an order 0 allocation is weird indeed, but this is a GFP_ATOMIC
allocation so it's a bit less weird.

Paolo