Re: [Xen-users] Xen 4 - Page Sharing HowTo?

[Andrew Lyon <andrew.lyon@xxxxxxxxx>]

On Fri, Apr 9, 2010 at 1:26 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
> On Fri, Apr 9, 2010 at 1:18 PM, Andrew Lyon <andrew.lyon@xxxxxxxxx> wrote:
>> On Thu, Apr 8, 2010 at 11:01 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx> 
>> wrote:
>>> One of the features listed as having been added to Xen 4 is page sharing 
>>> for HVM domUs.  I was wondering if 1) this is automatic, or something that 
>>> must be enabled, and 2) if it must be enabled, how do you go about enabling 
>>> it?
>>>
>>> Thanks!
>>> -Nick
>>
>> See 
>> http://lists.xensource.com/archives/html/xen-changelog/2009-12/msg00192.html
>>
>> The setting you need to add is memory_sharing
>>
>> I think it may require hap but I am not sure yet.. just about to test it.
>>
>> Andy
>>
>
> I added memory_sharing=1 to two hvm guests and started them up, xm log
> shows that the setting was applied but there seems to be no change in
> the reported memory usage, is there any way to monitor shared memory
> performance?
>
> Andy
>

I don't think memory_sharing=1 works at all, the very first thing that
should happen when it is enabled is a printk:

void mem_sharing_init(void)
{
    printk("Initing memory sharing.\n");


But I've not seen that at all on my 4.x system.

Andy

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