Re: [PATCH][RF C/T/D] Unmapped page cache control - via boot parameter

[Anthony Liguori]

On 03/15/2010 04:27 AM, Avi Kivity wrote:
> That's only beneficial if the cache is shared.  Otherwise, you could 
> use the balloon to evict cache when memory is tight.
>
> Shared cache is mostly a desktop thing where users run similar 
> workloads.  For servers, it's much less likely.  So a modified-guest 
> doesn't help a lot here.

Not really.  In many cloud environments, there's a set of common images 
that are instantiated on each node.  Usually this is because you're 
running a horizontally scalable application or because you're supporting 
an ephemeral storage model.

In fact, with ephemeral storage, you typically want to use 
cache=writeback since you aren't providing data guarantees across 
shutdown/failure.

Regards,

Anthony Liguori
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