Re: [Xen-devel] tmem ephemeral page discarding

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sun, Jun 02, 2013 at 04:06:18AM +0000, James Harper wrote:
> How does Xen manage ephemeral pages? Is there a way to manage the priority of 
> pages in the ephemeral store? In my use case, I would prefer that an old page 
> was automatically discarded to make room for a new page, and that pages that 
> have been retrieved already are more likely to be discarded than a page that 
> has not yet been retrieved.
> 

In other words an LRU system with bounds. Right now the bounds are the amount 
of memory available and 
when Xen needs more memory the bounds gets decreased - which will discard the 
least used ephermeal pages.

There is a tmem subop to actually set the cap (TMEMC_SET_CAP), which sets the 
cap value. However
I am not seeing in the code anybody using it. Hmmm

> Thanks
> 
> James
> 
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