KSM related queries

>> 3. Are there any means to do content-based page sharing between guests
>> as VMware does ?
>>
>
> Yes, KSM.
>

How does KSM offers its services.  saw in the archives that there is
some /dev/ksm device.
I mean what are the major steps involved:

Is this feature turned on from the beginning ? i.e, always when a
guest page is created it is scanned for similarity with existing pages
and shared ? or, is  it trigger at some events ? If so, when is it
trigerred ?

Is sharing done only between the pages which have been registered via
KSM_REGISTER_MEMORY_REGION ?

What are these for ? KSM_CREATE_SHARED_MEMORY_AREA and KSM_CREATE_SCAN ?

How much is the overhead involved due to this ?


-- 
Regards,
Sukanto Ghosh
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