linux-kernel - RE: [PATCH v6 00/21] x86/resctrl: Make resctrl_arch_rmid

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Date:   Tue, 13 Sep 2022 01:00:17 +0000
From:   "tan.shaopeng@...itsu.com" <tan.shaopeng@...itsu.com>
To:     'James Morse' <james.morse@....com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.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" 
        <shameerali.kolothum.thodi@...wei.com>,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        "lcherian@...vell.com" <lcherian@...vell.com>,
        "bobo.shaobowang@...wei.com" <bobo.shaobowang@...wei.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Cristian Marussi <cristian.marussi@....com>,
        Xin Hao <xhao@...ux.alibaba.com>,
        "xingxin.hx@...nanolis.org" <xingxin.hx@...nanolis.org>,
        "baolin.wang@...ux.alibaba.com" <baolin.wang@...ux.alibaba.com>
Subject: RE: [PATCH v6 00/21] x86/resctrl: Make resctrl_arch_rmid_read()
 return values in bytes

Hi James,

> Changes in this version?
>  * Changed supports_mba_mbps() to use is_mbm_local_enabled()
> 
> ---
> The aim of this series is to insert a split between the parts of the monitor code
> that the architecture must implement, and those that are part of the resctrl
> filesystem. The eventual aim is to move all filesystem parts out to live in
> /fs/resctrl, so that resctrl can be wired up for MPAM.
> 
> What's MPAM? See the cover letter of a previous series. [1]
> 
> The series adds domain online/offline callbacks to allow the filesystem to
> manage some of its structures itself, then moves all the 'mba_sc' behaviour to
> be part of the filesystem.
> This means another architecture doesn't need to provide an mbps_val array.
> As its all software, the resctrl filesystem should be able to do this without any
> help from the architecture code.
> 
> Finally __rmid_read() is refactored to be the API call that the architecture
> provides to read a counter value. All the hardware specific overflow detection,
> scaling and value correction should occur behind this helper.
> 
> 
> This series is based on v6.0-rc3, and can be retrieved from:
> git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
> mpam/resctrl_monitors_in_bytes/v6
> 
> [0] git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
> mpam/resctrl_merge_cdp/v7 [1]
> https://lore.kernel.org/lkml/20210728170637.25610-1-james.morse@arm.com
> /
> 
> Previous versions of this series:
> [v1]
> https://lore.kernel.org/lkml/20210729223610.29373-1-james.morse@arm.com
> /
> [v2]
> https://lore.kernel.org/lkml/20211001160302.31189-1-james.morse@arm.com
> /
> [v3]
> https://lore.kernel.org/lkml/20220217182110.7176-1-james.morse@arm.com/
> [v4]
> https://lore.kernel.org/lkml/20220412124419.30689-1-james.morse@arm.com
> /
> [v5]
> https://lore.kernel.org/lkml/20220622164629.20795-1-james.morse@arm.com
> /
> 
> James Morse (21):
>   x86/resctrl: Kill off alloc_enabled
>   x86/resctrl: Merge mon_capable and mon_enabled
>   x86/resctrl: Add domain online callback for resctrl work
>   x86/resctrl: Group struct rdt_hw_domain cleanup
>   x86/resctrl: Add domain offline callback for resctrl work
>   x86/resctrl: Remove set_mba_sc()s control array re-initialisation
>   x86/resctrl: Abstract and use supports_mba_mbps()
>   x86/resctrl: Create mba_sc configuration in the rdt_domain
>   x86/resctrl: Switch over to the resctrl mbps_val list
>   x86/resctrl: Remove architecture copy of mbps_val
>   x86/resctrl: Allow update_mba_bw() to update controls directly
>   x86/resctrl: Calculate bandwidth from the previous __mon_event_count()
>     chunks
>   x86/resctrl: Add per-rmid arch private storage for overflow and chunks
>   x86/resctrl: Allow per-rmid arch private storage to be reset
>   x86/resctrl: Abstract __rmid_read()
>   x86/resctrl: Pass the required parameters into
>     resctrl_arch_rmid_read()
>   x86/resctrl: Move mbm_overflow_count() into resctrl_arch_rmid_read()
>   x86/resctrl: Move get_corrected_mbm_count() into
>     resctrl_arch_rmid_read()
>   x86/resctrl: Rename and change the units of resctrl_cqm_threshold
>   x86/resctrl: Add resctrl_rmid_realloc_limit to abstract x86's
>     boot_cpu_data
>   x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes
> 
>  arch/x86/include/asm/resctrl.h            |   9 +
>  arch/x86/kernel/cpu/resctrl/core.c        | 117 ++++-------
>  arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  75 ++++---
>  arch/x86/kernel/cpu/resctrl/internal.h    |  61 +++---
>  arch/x86/kernel/cpu/resctrl/monitor.c     | 232
> ++++++++++++++--------
>  arch/x86/kernel/cpu/resctrl/pseudo_lock.c |   2 +-
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 216
> ++++++++++++++++----
>  include/linux/resctrl.h                   |  64 +++++-
>  8 files changed, 514 insertions(+), 262 deletions(-)
> 
> --
> 2.30.2
I tested this patch series(patch v6) on Intel(R) Xeon(R) Gold 6254 CPU with resctrl selftest.
It is no problem.

Reviewed-by: Shaopeng Tan <tan.shaopeng@...itsu.com>
Tested-by: Shaopeng Tan <tan.shaopeng@...itsu.com>