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Message-ID: <b674aa71-bd06-4cd9-be3e-13e99fb23f15@intel.com>
Date: Wed, 23 Oct 2024 17:08:31 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: James Morse <james.morse@....com>, <x86@...nel.org>,
<linux-kernel@...r.kernel.org>
CC: Fenghua Yu <fenghua.yu@...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>, Shaopeng Tan
<tan.shaopeng@...fujitsu.com>
Subject: Re: [PATCH v5 38/40] fs/resctrl: Add boiler plate for external
resctrl code
Hi James,
On 10/4/24 11:03 AM, James Morse wrote:
...
> +++ b/fs/resctrl/Kconfig
> @@ -0,0 +1,37 @@
> +config RESCTRL_FS
> + bool "CPU Resource Control Filesystem (resctrl)"
> + depends on ARCH_HAS_CPU_RESCTRL
> + select KERNFS
> + select PROC_CPU_RESCTRL if PROC_FS
> + help
> + Some architectures provide hardware facilities to group tasks and
> + monitor and control their usage of memory system resources such as
> + caches and memory bandwidth. Examples of such facilities include
> + Intel's Resource Director Technology (Intel(R) RDT) and AMD's
> + Platform Quality of Service (AMD QoS).
> +
> + If your system has the necessary support and you want to be able to
> + assign tasks to groups and manipulate the associated resource
> + monitors and controls from userspace, say Y here to get a mountable
> + 'resctrl' filesystem that lets you do just that.
> +
> + If nothing mounts or prods the 'resctrl' filesystem, resource
> + controls and monitors are left in a quiescent, permissive state.
> +
> + On architectures where this can be disabled independently, it is
> + safe to say N.
> +
> + See <file:Documentation/arch/x86/resctrl.rst> for more information.
> +
> +config RESCTRL_FS_PSEUDO_LOCK
> + bool
> + help
> + Software mechanism to pin data in a cache portion using
> + micro-architecture specific knowledge.
> +
There now seems to be two copies of this ... patch #23 added this exact same
"config RESCTRL_FS_PSEUDO_LOCK" snippet to arch/x86/Kconfig
> +config RESCTRL_RMID_DEPENDS_ON_CLOSID
> + bool
> + help
> + Enable by the architecture when the RMID values depend on the CLOSID.
"Enable by" -> "Enabled by"?
> + This causes the closid allocator to search for CLOSID with clean
> + RMID.
Reinette
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