RE: [PATCH v2 06/33] Documentation, x86: Documentation for Intel resource allocation user interface

From	"Luck, Tony" <tony.luck@intel.com>
Newsgroups	linux.kernel
Subject	RE: [PATCH v2 06/33] Documentation, x86: Documentation for Intel resource allocation user interface
Date	2016-09-09 20:10 +0200
Message-ID	<sfypr-6k2-3@gated-at.bofh.it> (permalink)
References	(2 earlier) <sffPP-3bV-3@gated-at.bofh.it> <sffPP-3bV-1@gated-at.bofh.it> <sflBU-6IG-19@gated-at.bofh.it> <sflBU-6IG-17@gated-at.bofh.it> <sfypr-6k2-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

Show all headers | View raw

> I don't think this is convenient, but it's ok. Now if we create a new thread
> between 1 and 2, the new thread is in group1. The new thread pid isn't in the
> pid list we found in 1, so after 2, the new thread still is in group 1. Truely
> sysadmin can repeat the step 1 & 2 and move the new thread to group 2, but
> there is always chance the process creates new thread between 1 and 2, and the
> new thread remains in group 1. There is no guarantee we can safely move a
> process from one group to another.

In general this is true.  But don't most threaded applications have a single thread that
is the one that spawns new threads? Typically the first thread.  Once that is moved,
any new threads will inherit the new group. So there won't be a neverending mopping
operation trying to catch up.

Even this seems outside the expected usage model for CAT where we expect the
system admin to partition the cache between resource groups at boot time and
then assign jobs (or containers, or VMs) to resource groups when they are created.

-Tony

Thread

[PATCH v2 00/33] Enable Intel Resource Allocation in Resource Director Technology  "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
  [PATCH v2 32/33] MAINTAINERS: Add maintainer for Intel RDT resource allocation "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
  [PATCH v2 30/33] x86/intel_rdt_rdtgroup.c: Process schemata input from resctrl interface "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
    Re: [PATCH v2 30/33] x86/intel_rdt_rdtgroup.c: Process schemata  input from resctrl interface Thomas Gleixner <tglx@linutronix.de> - 2016-09-09 00:30 +0200
  [PATCH v2 31/33] Documentation/kernel-parameters: Add kernel parameter "resctrl" for CAT "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:00 +0200
    Re: [PATCH v2 31/33] Documentation/kernel-parameters: Add kernel  parameter "resctrl" for CAT Thomas Gleixner <tglx@linutronix.de> - 2016-09-09 00:30 +0200
  [PATCH v2 28/33] x86/intel_rdt_rdtgroup.c: Read and write cpus "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 28/33] x86/intel_rdt_rdtgroup.c: Read and write cpus Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 22:30 +0200
  [PATCH v2 24/33] x86/intel_rdt_rdtgroup.c: Create info directory "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 24/33] x86/intel_rdt_rdtgroup.c: Create info  directory Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 18:10 +0200
  [PATCH v2 11/33] x86/intel_rdt: Hot cpu support for Cache Allocation "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 11/33] x86/intel_rdt: Hot cpu support for Cache  Allocation Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:10 +0200
    Re: [PATCH v2 11/33] x86/intel_rdt: Hot cpu support for Cache Allocation Nilay Vaish <nilayvaish@gmail.com> - 2016-09-13 20:20 +0200
      RE: [PATCH v2 11/33] x86/intel_rdt: Hot cpu support for Cache  Allocation "Luck, Tony" <tony.luck@intel.com> - 2016-09-13 21:20 +0200
  [PATCH v2 13/33] Define CONFIG_INTEL_RDT "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 13/33] Define CONFIG_INTEL_RDT Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:20 +0200
  [PATCH v2 08/33] x86/intel_rdt: Add Class of service management "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 08/33] x86/intel_rdt: Add Class of service  management Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 11:00 +0200
    Re: [PATCH v2 08/33] x86/intel_rdt: Add Class of service management Nilay Vaish <nilayvaish@gmail.com> - 2016-09-12 18:10 +0200
  [PATCH v2 22/33] x86/intel_rdt.c: Extend RDT to per cache and per resources "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 22/33] x86/intel_rdt.c: Extend RDT to per cache and  per resources Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 17:10 +0200
    Re: [PATCH v2 22/33] x86/intel_rdt.c: Extend RDT to per cache and per  resources Dave Hansen <dave.hansen@intel.com> - 2016-09-14 01:00 +0200
  [PATCH v2 20/33] x86/intel_rdt.h: Header for inter_rdt.c "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 20/33] x86/intel_rdt.h: Header for inter_rdt.c Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 14:40 +0200
  [PATCH v2 10/33] x86/intel_rdt: Implement scheduling support for Intel RDT "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 10/33] x86/intel_rdt: Implement scheduling support  for Intel RDT Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:00 +0200
      RE: [PATCH v2 10/33] x86/intel_rdt: Implement scheduling support  for Intel RDT "Yu, Fenghua" <fenghua.yu@intel.com> - 2016-09-15 23:40 +0200
        RE: [PATCH v2 10/33] x86/intel_rdt: Implement scheduling support  for Intel RDT "Luck, Tony" <tony.luck@intel.com> - 2016-09-15 23:50 +0200
    Re: [PATCH v2 10/33] x86/intel_rdt: Implement scheduling support for  Intel RDT Nilay Vaish <nilayvaish@gmail.com> - 2016-09-13 20:00 +0200
  [PATCH v2 16/33] x86/intel_rdt: Class of service and capacity bitmask management for CDP "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 16/33] x86/intel_rdt: Class of service and capacity  bitmask management for CDP Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:40 +0200
  [PATCH v2 04/33] drivers/base/cacheinfo.c: Export some cacheinfo functions for others to use "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 04/33] drivers/base/cacheinfo.c: Export some cacheinfo  functions for others to use Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 10:30 +0200
  [PATCH v2 25/33] include/linux/resctrl.h: Define fork and exit functions in a new header file "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 25/33] include/linux/resctrl.h: Define fork and exit  functions in a new header file Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 18:20 +0200
  [PATCH v2 27/33] x86/intel_rdt_rdtgroup.c: Implement resctrl file system commands "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 27/33] x86/intel_rdt_rdtgroup.c: Implement resctrl  file system commands Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 22:20 +0200
    Re: [PATCH v2 27/33] x86/intel_rdt_rdtgroup.c: Implement resctrl  file system commands Fenghua Yu <fenghua.yu@intel.com> - 2016-09-09 00:30 +0200
  [PATCH v2 29/33] x86/intel_rdt_rdtgroup.c: Tasks iterator and write "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 29/33] x86/intel_rdt_rdtgroup.c: Tasks iterator and  write Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 23:00 +0200
  [PATCH v2 17/33] x86/intel_rdt: Hot cpu update for code data prioritization "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 17/33] x86/intel_rdt: Hot cpu update for code data  prioritization Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:40 +0200
  [PATCH v2 06/33] Documentation, x86: Documentation for Intel resource allocation user interface "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface Borislav Petkov <bp@suse.de> - 2016-09-08 13:30 +0200
    Re: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface Fenghua Yu <fenghua.yu@intel.com> - 2016-09-09 00:20 +0200
      Re: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface Fenghua Yu <fenghua.yu@intel.com> - 2016-09-09 06:30 +0200
        RE: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface "Luck, Tony" <tony.luck@intel.com> - 2016-09-09 20:10 +0200
          RE: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface "Luck, Tony" <tony.luck@intel.com> - 2016-09-10 00:10 +0200
            RE: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface "Yu, Fenghua" <fenghua.yu@intel.com> - 2016-09-10 02:40 +0200
              Re: [PATCH v2 06/33] Documentation, x86: Documentation for Intel  resource allocation user interface Thomas Gleixner <tglx@linutronix.de> - 2016-09-13 15:40 +0200
  [PATCH v2 03/33] x86, intel_cacheinfo: Enable cache id in x86 "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
  [PATCH v2 09/33] x86/intel_rdt: Add L3 cache capacity bitmask management "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 09/33] x86/intel_rdt: Add L3 cache capacity bitmask  management Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 11:50 +0200
    Re: [PATCH v2 09/33] x86/intel_rdt: Add L3 cache capacity bitmask management Nilay Vaish <nilayvaish@gmail.com> - 2016-09-12 18:20 +0200
  [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation detection "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation  detection Borislav Petkov <bp@suse.de> - 2016-09-08 14:00 +0200
      RE: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache  Allocation detection "Yu, Fenghua" <fenghua.yu@intel.com> - 2016-09-08 19:00 +0200
        Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation  detection Borislav Petkov <bp@suse.de> - 2016-09-08 19:20 +0200
    Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation  detection Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 15:20 +0200
      RE: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache  Allocation detection "Yu, Fenghua" <fenghua.yu@intel.com> - 2016-09-08 16:00 +0200
    Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation  detection Dave Hansen <dave.hansen@intel.com> - 2016-09-14 00:50 +0200
      Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation  detection "Luck, Tony" <tony.luck@intel.com> - 2016-09-14 01:00 +0200
        Re: [PATCH v2 07/33] x86/intel_rdt: Add support for Cache Allocation  detection Dave Hansen <dave.hansen@intel.com> - 2016-09-14 01:10 +0200
  [PATCH v2 01/33] cacheinfo: Introduce cache id "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 01/33] cacheinfo: Introduce cache id Nilay Vaish <nilayvaish@gmail.com> - 2016-09-09 17:10 +0200
  [PATCH v2 05/33] x86/intel_rdt: Cache Allocation documentation "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
  [PATCH v2 19/33] magic number for resctrl file system "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 19/33] magic number for resctrl file system Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:50 +0200
      Re: [PATCH v2 19/33] magic number for resctrl file system Borislav Petkov <bp@alien8.de> - 2016-09-08 12:50 +0200
  [PATCH v2 21/33] x86/intel_rdt_rdtgroup.h: Header for user interface "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 21/33] x86/intel_rdt_rdtgroup.h: Header for user  interface Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 14:50 +0200
  [PATCH v2 26/33] Task fork and exit for rdtgroup "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 26/33] Task fork and exit for rdtgroup Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 21:50 +0200
    Re: [PATCH v2 26/33] Task fork and exit for rdtgroup Dave Hansen <dave.hansen@intel.com> - 2016-09-14 01:20 +0200
      Re: [PATCH v2 26/33] Task fork and exit for rdtgroup "Luck, Tony" <tony.luck@intel.com> - 2016-09-14 01:40 +0200
        Re: [PATCH v2 26/33] Task fork and exit for rdtgroup Dave Hansen <dave.hansen@intel.com> - 2016-09-14 16:30 +0200
  [PATCH v2 18/33] sched.h: Add rg_list and rdtgroup in task_struct "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 18/33] sched.h: Add rg_list and rdtgroup in  task_struct Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:40 +0200
  [PATCH v2 02/33] Documentation, ABI: Add a document entry for cache id "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 02/33] Documentation, ABI: Add a document entry for  cache id Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 21:40 +0200
      Re: [PATCH v2 02/33] Documentation, ABI: Add a document entry for  cache id Nilay Vaish <nilayvaish@gmail.com> - 2016-09-09 17:20 +0200
  [PATCH v2 12/33] x86/intel_rdt: Intel haswell Cache Allocation enumeration "Fenghua Yu" <fenghua.yu@intel.com> - 2016-09-08 09:10 +0200
    Re: [PATCH v2 12/33] x86/intel_rdt: Intel haswell Cache Allocation  enumeration Thomas Gleixner <tglx@linutronix.de> - 2016-09-08 12:20 +0200

csiph-web