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Re: [PATCH V16 00/11] x86: Intel Cache Allocation Technology Support

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On Thu, 17 Dec 2015, Fenghua Yu wrote:

> 	Intel Cache allocation support:
>
> 	Cache allocation patches adds a cgroup subsystem to support the new
> Cache Allocation feature found in future Intel Xeon Intel processors.
> Cache Allocation is a sub-feature with in Resource Director
> Technology(RDT) feature. Current patches support only L3 cache
> allocation.
>
> Cache Allocation provides a way for the Software (OS/VMM) to restrict
> cache allocation to a defined 'subset' of cache which may be overlapping
> with other 'subsets'.  This feature is used when a thread is allocating
> a cache line ie when pulling new data into the cache.
>
> Threads are associated with a CLOS(Class of service). OS specifies the
> CLOS of a thread by writing the IA32_PQR_ASSOC MSR during context
> switch. The cache capacity associated with CLOS 'n' is specified by
> writing to the IA32_L3_MASK_n MSR.

Could you also support another low level interface where a task (or
process) can set the CLOS id itself if it has CAP_SYS_NICE. Plus some way
for the supervisor to directly control the IA32_L3_MASK_n MSR?

Is there a way to see these values for debugging purposes?

We tightly control processes and bind them to processors. cpusets are
often a too high level instrument at that level.

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[PATCH V16 00/11] x86: Intel Cache Allocation Technology Support "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
  [PATCH V16 01/11] x86/intel_cqm: Modify hot cpu notification handling "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_cqm:   Modify hot cpu notification handling tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 03/11] x86/intel_rdt: Cache Allocation documentation "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_rdt: Cache Allocation documentation tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 07/11] x86/intel_rdt: Implement scheduling support for Intel RDT "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_rdt:   Implement scheduling support for Intel RDT tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 04/11] x86/intel_rdt: Add support for Cache Allocation detection "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_rdt:   Add support for Cache Allocation detection tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 09/11] x86/intel_rdt: Intel haswell Cache Allocation enumeration "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_rdt:   Intel haswell Cache Allocation enumeration tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 08/11] x86/intel_rdt: Hot cpu support for Cache Allocation "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_rdt:   Hot cpu support for Cache Allocation tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 06/11] x86/intel_rdt: Add L3 cache capacity bitmask management "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86/intel_rdt:   Add L3 cache capacity bitmask management tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
  [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface to manage Intel cache allocation "Fenghua Yu" <fenghua.yu@intel.com> - 2015-12-17 21:10 +0100
    [tip:x86/cache] x86,cgroup/intel_rdt :   Add a cgroup interface to manage Intel cache allocation tip-bot for Fenghua Yu <tipbot@zytor.com> - 2015-12-18 22:40 +0100
    Re: [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface  to manage Intel cache allocation Thomas Gleixner <tglx@linutronix.de> - 2015-12-19 11:50 +0100
      Re: [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface  to manage Intel cache allocation Marcelo Tosatti <mtosatti@redhat.com> - 2015-12-21 13:00 +0100
        Re: [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface  to manage Intel cache allocation Thomas Gleixner <tglx@linutronix.de> - 2015-12-21 14:50 +0100
        Re: [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface  to manage Intel cache allocation Luiz Capitulino <lcapitulino@redhat.com> - 2015-12-21 16:50 +0100
          Re: [PATCH V16 11/11] x86,cgroup/intel_rdt : Add a cgroup interface  to manage Intel cache allocation Marcelo Tosatti <mtosatti@redhat.com> - 2015-12-22 00:10 +0100
  Re: [PATCH V16 00/11] x86: Intel Cache Allocation Technology  Support Christoph Lameter <cl@linux.com> - 2015-12-18 18:50 +0100
    Re: [PATCH V16 00/11] x86: Intel Cache Allocation Technology Support Marcelo Tosatti <mtosatti@redhat.com> - 2015-12-21 13:00 +0100
      Re: [PATCH V16 00/11] x86: Intel Cache Allocation Technology  Support Christoph Lameter <cl@linux.com> - 2015-12-21 14:00 +0100
  Re: [PATCH V16 00/11] x86: Intel Cache Allocation Technology  Support Luiz Capitulino <lcapitulino@redhat.com> - 2015-12-21 17:00 +0100
  Re: [PATCH V16 00/11] x86: Intel Cache Allocation Technology Support Tejun Heo <tj@kernel.org> - 2015-12-23 17:00 +0100

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