[libvirt] [V2]RFC for support cache tune in libvirt

[Qiao, Liyong]

Hi folks

I’v send the V1 version RFC early this week, but no reply yet.

Thanks Qiaowei for the comment, I’v change the RFC much more libvirt specify, please help to comments on.

##Propose Changes

#Libvirtd configure changes

Add a new configure option cache_allocation_ratio to libvirtd, which let libvirt to allocate how many cache to domains.

Default is 0.5

Eg.
On a host which has 55M cache, libvirt can allocate 55M * cache_allocation_ratio cache to domains

## Virsh command line changes:

 NAME
   cachetune - control or query domain cache allocation

 SYNOPSIS
   cachetune <domain> [--enabled true/false] [--type <type>][--size <number>] [--config] [--live] [--current]

 DESCRIPTION
   Allocate cache usage for domain.

 OPTIONS
   [--domain] <string>  domain name, id or uuid
   --enabled <true/false>  enable cache allocation
   --type <string>  cache allocations type, support l3/l2 etc
   --size <number> the cache size in KB
   --config         affect next boot
   --live           affect running domain
   --current        affect current domain

This will allow libvirt to allocate specify type l3 cache for a domain

Domain xml changes:

<cachetune>
<enabled=’yes’, size=4096, actual_size=4680,type=’l3’>
<enabled=’no’, size=256, actual_size=0, type=’l2’>
</cachetune>


For more information about the detail design, please refer https://www.redhat.com/archives/libvir-list/2016-December/msg01011.html

CAT intro: https://software.intel.com/en-us/articles/software-enabling-for-cache-allocation-technology



Best Regards

Eli Qiao(乔立勇）OpenStack Core team OTC Intel.
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