linux-kernel - Re: [PATCH v8 00/24] x86/resctrl: monitored closid+rmid together, separate arch/fs locking

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Date: Mon, 22 Jan 2024 18:06:53 +0000
From: James Morse <james.morse@....com>
To: Carl Worth <carl@...amperecomputing.com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Cc: Fenghua Yu <fenghua.yu@...el.com>,
 Reinette Chatre <reinette.chatre@...el.com>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, H Peter Anvin <hpa@...or.com>,
 Babu Moger <Babu.Moger@....com>, shameerali.kolothum.thodi@...wei.com,
 D Scott Phillips OS <scott@...amperecomputing.com>, lcherian@...vell.com,
 bobo.shaobowang@...wei.com, tan.shaopeng@...itsu.com,
 baolin.wang@...ux.alibaba.com, Jamie Iles <quic_jiles@...cinc.com>,
 Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
 dfustini@...libre.com, amitsinght@...vell.com
Subject: Re: [PATCH v8 00/24] x86/resctrl: monitored closid+rmid together,
 separate arch/fs locking

Hi Carl,

On 22/12/2023 22:43, Carl Worth wrote:
> James Morse <james.morse@....com> writes:
>> This series does two things, it changes resctrl to call resctrl_arch_rmid_read()
>> in a way that works for MPAM, and it separates the locking so that the arch code
>> and filesystem code don't have to share a mutex. I tried to split this as two
>> series, but these touch similar call sites, so it would create more work.
>>
>> (What's MPAM? See the cover letter of the first series. [1])
> 
> Thanks, James. This is really useful for us at Ampere since it enables
> the MPAM driver on top of this series.
> 
> I've tested this series on an Ampere implementation, by successfully
> using resctrl to configure and exercise MPAM functionality.

Great! Thanks for this.


> I can't
> speak to the effects of the refactor on x86 since I have not tested that
> all.

> For the series:
> Tested-by: Carl Worth <carl@...amperecomputing.com>

Thanks, I'll add an "# arm64" on the end of that to preserve your above comment about not
testing this on x86.


Thanks,

James