linux-kernel - Re: [PATCH v7 27/49] x86/resctrl: Move RFTYPE flags to be managed by resctrl

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Message-ID: <074280aa-1e18-48fe-a802-9e6ec4bd04b6@nvidia.com>
Date: Thu, 6 Mar 2025 13:37:28 -0800
From: Fenghua Yu <fenghuay@...dia.com>
To: James Morse <james.morse@....com>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Cc: 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>,
 carl@...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,
 David Hildenbrand <david@...hat.com>, Rex Nie <rex.nie@...uarmicro.com>,
 Dave Martin <dave.martin@....com>, Koba Ko <kobak@...dia.com>,
 Shanker Donthineni <sdonthineni@...dia.com>
Subject: Re: [PATCH v7 27/49] x86/resctrl: Move RFTYPE flags to be managed by
 resctrl


On 2/28/25 11:58, James Morse wrote:
> resctrl_file_fflags_init() is called from the architecture specific code
> to make the 'thread_throttle_mode' file visible. The architecture specific
> code has already set the membw.throttle_mode in the rdt_resource.
>
> This forces the RFTYPE flags used by resctrl to be exposed to the
> architecture specific code.
>
> This doesn't need to be specific to the architecture, the throttle_mode
> can be used by resctrl to determine if the 'thread_throttle_mode' file
> should be visible. This allows the RFTYPE flags to be private to resctrl.
>
> Add thread_throttle_mode_init(), and use it to call
> resctrl_file_fflags_init() from resctrl_init(). This avoids
> publishing an extra function between the architecture and filesystem
> code.
>
> Signed-off-by: James Morse <james.morse@....com>
> Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Reviewed-by: Fenghua Yu <fenghuay@...dia.com>


Thanks.


-Fenghua