Re: [Qemu-devel] [RFC PATCH v2 01/12] mc: add documentation for micro-checkpointing

["Michael R. Hines" <mrhines@linux.vnet.ibm.com>]

On 02/20/2014 07:14 PM, Li Guang wrote:
> Dr. David Alan Gilbert wrote:
>> * Michael R. Hines (mrhines@linux.vnet.ibm.com) wrote:
>>> On 02/19/2014 07:27 PM, Dr. David Alan Gilbert wrote:
>>>> I was just wondering if a separate 'max buffer size' knob would allow
>>>> you to more reasonably bound memory without setting policy; I don't 
>>>> think
>>>> people like having potentially x2 memory.
>>> Note: Checkpoint memory is not monotonic in this patchset (which
>>> is unique to this implementation). Only if the guest actually dirties
>>> 100% of it's memory between one checkpoint to the next will
>>> the host experience 2x memory usage for a short period of time.
>> Right, but that doesn't really help - if someone comes along and says
>> 'How much memory do I need to be able to run an mc system?' the only
>> safe answer is 2x, otherwise we're adding a reason why the previously
>> stable guest might OOM.
>>
>
> so we may have to involve some disk operations
> to handle memory exhaustion.
>
> Thanks!

Like a cgroups memory limit, for example?

- Michael