From: "Moger, Babu" <Babu.Moger@amd.com>
To: James Morse <james.morse@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"hpa@zytor.com" <hpa@zytor.com>,
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Subject: Re: [RFC PATCH 00/10] arch/x86: AMD QoS support
Date: Fri, 5 Oct 2018 17:03:51 +0000 [thread overview]
Message-ID: <5fc7797c-6246-d865-9232-cbe26b833fec@amd.com> (raw)
In-Reply-To: <ab23dbf9-276c-73c3-933b-1354ef6da355@arm.com>
Hi James,
On 10/05/2018 11:18 AM, James Morse wrote:
> Hi Babu,
>
> (Thanks for looping me in!)
>
> On 28/09/18 02:57, Moger, Babu wrote:
>>> On Mon, 24 Sep 2018, Moger, Babu wrote:
>>>
>>>> This series adds support for AMD64 architectural extensions for Platform
>>>> Quality of Service. These extensions are intended to provide for the
>>>> monitoring of the usage of certain system resources by one or more
>>>> processors and for the separate allocation and enforcement of limits on
>>>> the use of certain system resources by one or more processors.
>>>>
>>>> The monitoring and enforcement are not necessarily applied across the
>>>> entire system, but in general apply to a QOS domain which corresponds to
>>>> some shared system resource. The set of resources which are monitored
>>> and
>>>> the set for which the enforcement of limits is provided are implementation
>>>> dependent. Platform QOS features are implemented on a logical processor
>>> basis.
>>>> Therefore, multiple hardware threads of a single physical CPU core may
>>> have
>>>> independent resource monitoring and enforcement configurations.
>>>>
>>>> AMD's next generation of processors support following QoS sub-features.
>>>> - L3 Cache allocation enforcement
>>>> - L3 Cache occupancy monitoring
>>>> - L3 Code-Data Prioritization support
>>>> - Memory Bandwidth Enforcement(Allocation)
>>>>
>>>> The public specification is still in works. Will add the link when it is
>>>> available.
>>>>
>>>> Obviously, there are multiple ways we can go about these changes. We felt
>>>> it is appropriate to rename and re-organize the code little bit before
>>>> making the functional changes. The first few patches(1-6) renames and
>>>> re-organizes the sources in preparation. Rest of the patches(7-10) adds
>>>> support for AMD QoS features.
>>>
>>> On the first glance this all looks sensible, but there is work in progress
>>> by James Morse (Cc'ed), who wants to generalize the resctrl filesystem so
>>> it can be reused by ARM. I just want to make sure that your reorganization
>>> is not colliding or creating duplicate effort.
>
> Aha, some of this makes my life easier. I'm against having the ABI different
> between architectures. This meant contiguous bitmaps on arm, which the MPAM
> stuff doesn't actually require...
>
>
>> Thanks for pointing this out. I have looked thru James patches. It appears this
>> series is only a small part of his much bigger change. Don't know the timeframe
>> of his overall changes.
>> I will let him speak on that.
>
> Longer, as its more invasive,
Ok. Thanks for the heads up.
>
>
>> That being said, I don't consider our efforts as
>> duplicate. He is touching the resource structures, and trying to separate arch,
>> non-arch components.
>> My changes are mostly inside the resource structures(mostly resource handlers)
>
>> and trying to accommodate minor differences within the architecture. It will
>> be mostly involve rebase
>> effort on either side in the end whoever goes first.
>
>> James, What are your thoughts?
>
> I think your stuff should go first. It doesn't look like you are adding new
> features/controls, so its normally:painful for me to rebase over it.
> (doing it the other-way round would be harder!)
Ok. Sounds good. I will send v2 version soon. Feel free to review.
>
>
> Thanks,
>
> James
>
next prev parent reply other threads:[~2018-10-05 17:03 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-24 19:18 [RFC PATCH 00/10] arch/x86: AMD QoS support Moger, Babu
2018-09-24 19:18 ` [RFC PATCH 01/10] arch/x86: Start renaming the rdt files to more generic names Moger, Babu
2018-09-24 19:18 ` [RFC PATCH 02/10] arch/x86: Rename the RDT functions and definitions Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 03/10] arch/x86: Re-arrange RDT init code Moger, Babu
2018-10-02 19:21 ` Reinette Chatre
2018-10-02 23:41 ` Moger, Babu
2018-10-03 18:54 ` Reinette Chatre
2018-10-03 20:12 ` Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 04/10] arch/x86: Introduce a new config parameter PLATFORM_QOS Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 05/10] arch/x86: Use new config parameter PLATFORM_QOS for compilation Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 06/10] arch/x86: Initialize the resource functions that are different Moger, Babu
2018-10-02 22:06 ` Reinette Chatre
2018-10-03 15:25 ` Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 07/10] arch/x86: Bring few more functions into the resource structure Moger, Babu
2018-10-02 22:07 ` Reinette Chatre
2018-10-03 15:32 ` Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 08/10] arch/x86: Introduce new config parameter AMD_QOS Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 09/10] arch/x86: Add AMD feature bit X86_FEATURE_MBA in cpuid bits array Moger, Babu
2018-09-24 19:19 ` [RFC PATCH 10/10] arch/x86: Introduce QOS feature for AMD Moger, Babu
2018-10-02 18:27 ` Fenghua Yu
2018-10-03 15:56 ` Moger, Babu
2018-10-02 22:13 ` Reinette Chatre
2018-10-03 17:21 ` Moger, Babu
2018-10-05 16:20 ` James Morse
2018-10-05 17:18 ` Moger, Babu
2018-09-27 20:14 ` [RFC PATCH 00/10] arch/x86: AMD QoS support Thomas Gleixner
2018-09-28 1:57 ` Moger, Babu
2018-10-05 16:18 ` James Morse
2018-10-05 17:03 ` Moger, Babu [this message]
2018-10-02 17:06 ` Fenghua Yu
2018-10-02 17:44 ` Moger, Babu
2018-10-02 18:46 ` Fenghua Yu
2018-10-02 19:16 ` Moger, Babu
2018-10-03 18:52 ` Fenghua Yu
2018-10-03 19:48 ` Thomas Gleixner
2018-10-03 20:09 ` Moger, Babu
2018-10-05 16:19 ` James Morse
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