linux-kernel - Re: [PATCH v2 00/23] x86/resctrl: Make resctrl_arch_rmid

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Date:   Tue, 19 Oct 2021 18:17:01 -0500
From:   Babu Moger <babu.moger@....com>
To:     James Morse <james.morse@....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>,
        shameerali.kolothum.thodi@...wei.com,
        Jamie Iles <jamie@...iainc.com>,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        lcherian@...vell.com, bobo.shaobowang@...wei.com,
        tan.shaopeng@...itsu.com
Subject: Re: [PATCH v2 00/23] x86/resctrl: Make resctrl_arch_rmid_read()
 return values in bytes

Hi James,
Thanks for the patches. Sanity tested on AMD box. Found one problem and
added few comments.
thanks
Babu

On 10/1/21 11:02 AM, James Morse wrote:
> Hello!
> 
> Patches 1&2 have been posted independently in case they are wanted as fixes.
> 
> The major change in this version is when the mba_mbps[] array is allocated.
> 
> ---
> 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 v5.15-rc3, and can be retrieved from:
> git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git mpam/resctrl_monitors_in_bytes/v2
> 
> [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/
> 
> [v1] https://lore.kernel.org/lkml/20210729223610.29373-1-james.morse@arm.com/
> 
> 
> Thanks,
> 
> James Morse (23):
>   x86/resctrl: Free the ctrlval arrays when domain_setup_mon_state()
>     fails
>   x86/resctrl: Fix kfree() of the wrong type in domain_add_cpu()
>   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: 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: Remove set_mba_sc()s control array re-initialisation
>   x86/resctrl: Abstract and use supports_mba_mbps()
>   x86/resctrl: Allow update_mba_bw() to update controls directly
>   x86/resctrl: Calculate bandwidth from the previous __mon_event_count()
>     chunks
>   x86/recstrl: Add per-rmid arch private storage for overflow and chunks
>   x86/recstrl: 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/kernel/cpu/resctrl/core.c        | 116 ++++--------
>  arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  75 +++++---
>  arch/x86/kernel/cpu/resctrl/internal.h    |  62 +++----
>  arch/x86/kernel/cpu/resctrl/monitor.c     | 200 ++++++++++++--------
>  arch/x86/kernel/cpu/resctrl/pseudo_lock.c |   2 +-
>  arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 217 ++++++++++++++++++----
>  include/linux/resctrl.h                   |  60 +++++-
>  7 files changed, 480 insertions(+), 252 deletions(-)
> 

-- 
Thanks
Babu Moger