linux-kernel - Re: [PATCH 27/33] arm_mpam: Track bandwidth counter state for power management

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <6f36dcda-ec5c-46f2-9e22-7e4334cc554b@redhat.com>
Date: Mon, 10 Nov 2025 09:15:53 +1000
From: Gavin Shan <gshan@...hat.com>
To: Ben Horgan <ben.horgan@....com>, james.morse@....com
Cc: amitsinght@...vell.com, baisheng.gao@...soc.com,
 baolin.wang@...ux.alibaba.com, bobo.shaobowang@...wei.com,
 carl@...amperecomputing.com, catalin.marinas@....com, dakr@...nel.org,
 dave.martin@....com, david@...hat.com, dfustini@...libre.com,
 fenghuay@...dia.com, gregkh@...uxfoundation.org, guohanjun@...wei.com,
 jeremy.linton@....com, jonathan.cameron@...wei.com, kobak@...dia.com,
 lcherian@...vell.com, lenb@...nel.org, linux-acpi@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 lpieralisi@...nel.org, peternewman@...gle.com, quic_jiles@...cinc.com,
 rafael@...nel.org, robh@...nel.org, rohit.mathew@....com,
 scott@...amperecomputing.com, sdonthineni@...dia.com, sudeep.holla@....com,
 tan.shaopeng@...itsu.com, will@...nel.org, xhao@...ux.alibaba.com,
 Zeng Heng <zengheng4@...wei.com>
Subject: Re: [PATCH 27/33] arm_mpam: Track bandwidth counter state for power
 management

On 11/7/25 10:34 PM, Ben Horgan wrote:
> From: James Morse <james.morse@....com>
> 
> Bandwidth counters need to run continuously to correctly reflect the
> bandwidth.
> 
> Save the counter state when the hardware is reset due to CPU hotplug.
> Add struct mbwu_state to track the bandwidth counter. Support for
> tracking overflow with the same structure will be added in a
> subsequent commit.
> 
> Cc: Zeng Heng <zengheng4@...wei.com>
> Signed-off-by: James Morse <james.morse@....com>
> Signed-off-by: Ben Horgan <ben.horgan@....com>
> ---
> Changes since v3:
> Drop tags
> Fix correction accounting
> Split out overflow checking
> ---
>   drivers/resctrl/mpam_devices.c  | 126 +++++++++++++++++++++++++++++++-
>   drivers/resctrl/mpam_internal.h |  21 +++++-
>   2 files changed, 145 insertions(+), 2 deletions(-)
> 

Reviewed-by: Gavin Shan <gshan@...hat.com>