Re: [Xen-devel] [PATCH 13/16] SUPPORT.md: Add secondary memory management features

[George Dunlap <george.dunlap@xxxxxxxxxx>]

On 11/21/2017 07:55 PM, Andrew Cooper wrote:
> On 13/11/17 15:41, George Dunlap wrote:
>> Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
>> ---
>> CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
>> CC: Wei Liu <wei.liu2@xxxxxxxxxx>
>> CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> CC: Jan Beulich <jbeulich@xxxxxxxx>
>> CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>> CC: Konrad Wilk <konrad.wilk@xxxxxxxxxx>
>> CC: Tim Deegan <tim@xxxxxxx>
>> CC: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>
>> ---
>>  SUPPORT.md | 31 +++++++++++++++++++++++++++++++
>>  1 file changed, 31 insertions(+)
>>
>> diff --git a/SUPPORT.md b/SUPPORT.md
>> index 0f7426593e..3e352198ce 100644
>> --- a/SUPPORT.md
>> +++ b/SUPPORT.md
>> @@ -187,6 +187,37 @@ Export hypervisor coverage data suitable for analysis 
>> by gcov or lcov.
>>  
>>      Status: Supported
>>  
>> +### Memory Sharing
>> +
>> +    Status, x86 HVM: Tech Preview
>> +    Status, ARM: Tech Preview
>> +
>> +Allow sharing of identical pages between guests
> 
> "Tech Preview" should imply there is any kind of `xl dedup-these-domains
> $X $Y` functionality.
> 
> The only thing we appears to have an example wrapper around the libxc
> interface, which requires the user to nominate individual frames, and
> this doesn't qualify as "functionally complete" IMO.

Right, I was getting confused with paging, which does have at least some
code in the tools/ directory.  (But perhaps should also be considered
experimental?  When was the last time anyone tried to use it?)

> There also doesn't appear to be any ARM support in the slightest. 
> mem_sharing_{memop,domctl}() are only implemented for x86.

Ack.

 -George

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