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From: Vikas Shivappa <vikas.shivappa@intel.com>
To: "Auld, Will" <will.auld@intel.com>
Cc: "Shivappa, Vikas" <vikas.shivappa@intel.com>,
	Marcelo Tosatti <mtosatti@redhat.com>,
	Vikas Shivappa <vikas.shivappa@linux.intel.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"x86@kernel.org" <x86@kernel.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@kernel.org" <mingo@kernel.org>,
	"tj@kernel.org" <tj@kernel.org>,
	"peterz@infradead.org" <peterz@infradead.org>,
	"Fleming, Matt" <matt.fleming@intel.com>,
	"Williamson, Glenn P" <glenn.p.williamson@intel.com>,
	"Juvva, Kanaka D" <kanaka.d.juvva@intel.com>
Subject: RE: [PATCH 3/9] x86/intel_rdt: Cache Allocation documentation and cgroup usage guide
Date: Wed, 29 Jul 2015 13:07:30 -0700 (PDT)	[thread overview]
Message-ID: <alpine.DEB.2.10.1507291304220.8113@vshiva-Udesk> (raw)
In-Reply-To: <96EC5A4F3149B74492D2D9B9B1602C27461EB932@ORSMSX105.amr.corp.intel.com>



On Tue, 28 Jul 2015, Auld, Will wrote:

>
>
>> -----Original Message-----
>>
>> Same comment as above - Cgroup masks can always overlap and other cgroups
>> can allocate the same cache , and hence wont have exclusive cache allocation.
>
> [Auld, Will] You can define all the cbm to provide one clos with an exclusive area

Do you mean a CLOS that has all the bits set. We donot support exclusive area 
today. The bits in the mask can overlap .. hence can always share the same cache 
allocation .

>
>>
>> So natuarally the cgroup with tasks would get to use the cache if it has the same
>> mask (say representing 50% of cache in your example) as others .
>
> [Auld, Will] automatic adjustment of the cbm make me nervous. There are times
> when we want to limit the cache for a process independent of whether there is
> lots of unused cache.
>

Please see example below - In general , I just mean the cache mask can have bits 
that can overlap - does not matter whether there is tasks in it or not.

>
>> (assume there are 8 bits max cbm)
>> cgroupa - mask - 0xf
>> cgroupb - mask - 0xf . Now if cgroupa has no tasks , cgroupb naturally gets all
>> the cache.
>>
>> Thanks,
>> Vikas

  parent reply	other threads:[~2015-07-29 20:07 UTC|newest]

Thread overview: 85+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-01 22:21 [PATCH V12 0/9] Hot cpu handling changes to cqm, rapl and Intel Cache Allocation support Vikas Shivappa
2015-07-01 22:21 ` [PATCH 1/9] x86/intel_cqm: Modify hot cpu notification handling Vikas Shivappa
2015-07-29 16:44   ` Peter Zijlstra
2015-07-31 23:19     ` Vikas Shivappa
2015-07-01 22:21 ` [PATCH 2/9] x86/intel_rapl: Modify hot cpu notification handling for RAPL Vikas Shivappa
2015-07-01 22:21 ` [PATCH 3/9] x86/intel_rdt: Cache Allocation documentation and cgroup usage guide Vikas Shivappa
2015-07-28 14:54   ` Peter Zijlstra
2015-08-04 20:41     ` Vikas Shivappa
2015-07-28 23:15   ` Marcelo Tosatti
2015-07-29  0:06     ` Vikas Shivappa
2015-07-29  1:28       ` Auld, Will
2015-07-29 19:32         ` Marcelo Tosatti
2015-07-30 17:47           ` Vikas Shivappa
2015-07-30 20:08             ` Marcelo Tosatti
2015-07-31 15:34               ` Marcelo Tosatti
2015-08-02 15:48               ` Martin Kletzander
2015-08-03 15:13                 ` Marcelo Tosatti
2015-08-03 18:22                   ` Vikas Shivappa
2015-07-30 20:22             ` Marcelo Tosatti
2015-07-30 23:03               ` Vikas Shivappa
2015-07-31 14:45                 ` Marcelo Tosatti
2015-07-31 16:41                   ` [summary] " Vikas Shivappa
2015-07-31 18:38                     ` Marcelo Tosatti
2015-07-29 20:07         ` Vikas Shivappa [this message]
2015-07-01 22:21 ` [PATCH 4/9] x86/intel_rdt: Add support for Cache Allocation detection Vikas Shivappa
2015-07-28 16:25   ` Peter Zijlstra
2015-07-28 22:07     ` Vikas Shivappa
2015-07-01 22:21 ` [PATCH 5/9] x86/intel_rdt: Add new cgroup and Class of service management Vikas Shivappa
2015-07-28 17:06   ` Peter Zijlstra
2015-07-30 18:01     ` Vikas Shivappa
2015-07-28 17:17   ` Peter Zijlstra
2015-07-30 18:10     ` Vikas Shivappa
2015-07-30 19:44   ` Tejun Heo
2015-07-31 15:12     ` Marcelo Tosatti
2015-08-02 16:23       ` Tejun Heo
2015-08-03 20:32         ` Marcelo Tosatti
2015-08-04 12:55           ` Marcelo Tosatti
2015-08-04 18:36             ` Tejun Heo
2015-08-04 18:32           ` Tejun Heo
2015-07-31 16:24     ` Vikas Shivappa
2015-08-02 16:31       ` Tejun Heo
2015-08-04 18:50         ` Vikas Shivappa
2015-08-04 19:03           ` Tejun Heo
2015-08-05  2:21             ` Vikas Shivappa
2015-08-05 15:46               ` Tejun Heo
2015-08-06 20:58                 ` Vikas Shivappa
2015-08-07 14:48                   ` Tejun Heo
2015-08-05 12:22         ` Matt Fleming
2015-08-05 16:10           ` Tejun Heo
2015-08-06  0:24           ` Marcelo Tosatti
2015-08-06 20:46             ` Vikas Shivappa
2015-08-07 13:15               ` Marcelo Tosatti
2015-08-18  0:20                 ` Marcelo Tosatti
2015-08-21  0:06                   ` Vikas Shivappa
2015-08-21  0:13                     ` Vikas Shivappa
2015-08-22  2:28                     ` Marcelo Tosatti
2015-08-23 18:47                       ` Vikas Shivappa
2015-08-24 13:06                         ` Marcelo Tosatti
2015-07-01 22:21 ` [PATCH 6/9] x86/intel_rdt: Add support for cache bit mask management Vikas Shivappa
2015-07-28 16:35   ` Peter Zijlstra
2015-07-28 22:08     ` Vikas Shivappa
2015-07-28 16:37   ` Peter Zijlstra
2015-07-30 17:54     ` Vikas Shivappa
2015-07-01 22:21 ` [PATCH 7/9] x86/intel_rdt: Implement scheduling support for Intel RDT Vikas Shivappa
2015-07-29 13:49   ` Peter Zijlstra
2015-07-30 18:16     ` Vikas Shivappa
2015-07-01 22:21 ` [PATCH 8/9] x86/intel_rdt: Hot cpu support for Cache Allocation Vikas Shivappa
2015-07-29 15:53   ` Peter Zijlstra
2015-07-31 23:21     ` Vikas Shivappa
2015-07-01 22:21 ` [PATCH 9/9] x86/intel_rdt: Intel haswell Cache Allocation enumeration Vikas Shivappa
2015-07-29 16:35   ` Peter Zijlstra
2015-08-03 20:49     ` Vikas Shivappa
2015-07-29 16:36   ` Peter Zijlstra
2015-07-30 18:45     ` Vikas Shivappa
2015-07-13 17:13 ` [PATCH V12 0/9] Hot cpu handling changes to cqm, rapl and Intel Cache Allocation support Vikas Shivappa
2015-07-16 12:55   ` Thomas Gleixner
2015-07-24 16:52 ` Thomas Gleixner
2015-07-24 18:28   ` Vikas Shivappa
2015-07-24 18:39     ` Thomas Gleixner
2015-07-24 18:45       ` Vikas Shivappa
2015-07-29 16:47     ` Peter Zijlstra
2015-07-29 22:53       ` Vikas Shivappa
2015-07-24 18:32   ` Vikas Shivappa
  -- strict thread matches above, loose matches on Subject: below --
2015-08-06 21:55 [PATCH V13 0/9] Intel cache allocation and Hot cpu handling changes to cqm, rapl Vikas Shivappa
2015-08-06 21:55 ` [PATCH 3/9] x86/intel_rdt: Cache Allocation documentation and cgroup usage guide Vikas Shivappa
2015-06-25 19:25 [PATCH V11 0/9] Hot cpu handling changes to cqm,rapl and Intel Cache Allocation support Vikas Shivappa
2015-06-25 19:25 ` [PATCH 3/9] x86/intel_rdt: Cache Allocation documentation and cgroup usage guide Vikas Shivappa

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