Re: [PATCH v2 00/35] x86/resctrl: Move the resctrl filesystem code to /fs/resctrl

[Dave Martin <Dave.Martin@arm.com>]

Hi Peter,

On Mon, Apr 29, 2024 at 04:34:34PM -0700, Peter Newman wrote:
> Hi Dave (and James),
> 
> On Fri, Apr 26, 2024 at 8:05 AM Dave Martin <Dave.Martin@arm.com> wrote:
> >
> > Hi all,
> >
> > This is a respin of the resctrl refactoring series described below,
> > addressing review feedback.  Many thanks to those to responded with
> > feedback on the v1 series [2].
> >
> > See Notes and FYIs in the individual patches for details on the changes
> > and outstanding issues.
> >
> >
> > This series has not been rebased since the v1 posting, and remains
> > based on the following upstream commit:
> >
> > commit 23956900041d968f9ad0f30db6dede4daccd7aa9
> > Merge tag 'v6.9-rc-smb3-server-fixes' of git://git.samba.org/ksmbd
> >
> > The actual code changes against v1 are few in number and rather spread
> > around.  For reviewer convenience, a diff against v1 is appended to
> > this cover letter.
> >
> > Due to the limited code changes, this series has *not* received any
> > additional runtime testing over than done for v1 (other than build
> > bisect testing).
> >
> > Cheers
> > ---Dave
> >
> >
> > [2] v1 series:
> > [PATCH v1 00/31] x86/resctrl: Move the resctrl filesystem code to /fs/resctrl
> > https://lore.kernel.org/all/20240321165106.31602-1-james.morse@arm.com/
> >
> > --8<-- Original blurb
> >
> > This is the final series that allows other architectures to implement resctrl.
> > The last patch just moves the code, and its a bit of a monster. I don't expect
> > that to get merged as part of this series - we should wait for it to make
> > less impact on other series. It's included here to show what gets moved, and
> > that structures/function-prototypes have the right visibility.
> >
> > Otherwise this series renames functions and moves code around. With the
> > exception of invalid configurations for the configurable-events, there should
> > be no changes in behaviour caused by this series.
> >
> > The driving pattern is to make things like struct rdtgroup private to resctrl.
> > Features like pseudo-lock aren't going to work on arm64, the ability to disable
> > it at compile time is added.
> >
> > After this, I can start posting the MPAM driver to make use of resctrl on arm64.
> > (What's MPAM? See the cover letter of the first series. [1])
> >
> > This series is based on Linus' commit 23956900041d and can be retrieved from:
> > https://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git
> > mpam/move_to_fs/v1
> >
> > Sorry for the mid-merge window base, I'm away for a few weeks - this should
> > rebase trivially onto rc1.
> >
> > As ever - bugs welcome,
> > Thanks,
> >
> > James
> >
> > [1] https://lore.kernel.org/lkml/20201030161120.227225-1-james.morse@arm.com/
> >
> > -->8--
> >
> >
> > Dave Martin (4):
> >   x86/resctrl: Squelch whitespace anomalies in resctrl core code
> >   x86/resctrl: Prefer alloc(sizeof(*foo)) idiom in rdt_init_fs_context()
> >   x86/resctrl: Relax some asm #includes
> >   [SQUASHME] x86/resctrl: Move the resctrl filesystem code to
> >     /fs/resctrl
> >
> > James Morse (31):
> >   x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no
> >     monitors
> >   x86/resctrl: Add a helper to avoid reaching into the arch code
> >     resource list
> >   x86/resctrl: Move ctrlval string parsing policy away from the arch
> >     code
> >   x86/resctrl: Add helper for setting CPU default properties
> >   x86/resctrl: Remove rdtgroup from update_cpu_closid_rmid()
> >   x86/resctrl: Export resctrl fs's init function
> >   x86/resctrl: Wrap resctrl_arch_find_domain() around rdt_find_domain()
> >   x86/resctrl: Move resctrl types to a separate header
> >   x86/resctrl: Add a resctrl helper to reset all the resources
> >   x86/resctrl: Move monitor init work to a resctrl init call
> >   x86/resctrl: Move monitor exit work to a resctrl exit call
> >   x86/resctrl: Move max_{name,data}_width into resctrl code
> >   x86/resctrl: Stop using the for_each_*_rdt_resource() walkers
> >   x86/resctrl: Export the is_mbm_*_enabled() helpers to asm/resctrl.h
> >   x86/resctrl: Add resctrl_arch_is_evt_configurable() to abstract BMEC
> >   x86/resctrl: Change mon_event_config_{read,write}() to be arch helpers
> >   x86/resctrl: Move mbm_cfg_mask to struct rdt_resource
> >   x86/resctrl: Allow resctrl_arch_mon_event_config_write() to return an
> >     error
> >   x86/resctrl: Add resctrl_arch_ prefix to pseudo lock functions
> >   x86/resctrl: Allow an architecture to disable pseudo lock
> >   x86/resctrl: Make prefetch_disable_bits belong to the arch code
> >   x86/resctrl: Make resctrl_arch_pseudo_lock_fn() take a plr
> >   x86/resctrl: Move thread_throttle_mode_init() to be managed by resctrl
> >   x86/resctrl: Move get_config_index() to a header
> >   x86/resctrl: Claim get_domain_from_cpu() for resctrl
> >   x86/resctrl: Describe resctrl's bitmap size assumptions
> >   x86/resctrl: Rename resctrl_sched_in() to begin with "resctrl_arch_"
> >   x86/resctrl: Drop __init/__exit on assorted symbols
> >   fs/resctrl: Add boiler plate for external resctrl code
> >   x86/resctrl: Move the filesystem bits to headers visible to fs/resctrl
> >   x86/resctrl: Move the resctrl filesystem code to /fs/resctrl
> >
> >  MAINTAINERS                               |    2 +
> >  arch/Kconfig                              |    8 +
> >  arch/x86/Kconfig                          |    5 +-
> >  arch/x86/include/asm/resctrl.h            |   45 +-
> >  arch/x86/kernel/cpu/resctrl/Makefile      |    5 +-
> >  arch/x86/kernel/cpu/resctrl/core.c        |  119 +-
> >  arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  506 +--
> >  arch/x86/kernel/cpu/resctrl/internal.h    |  436 +--
> >  arch/x86/kernel/cpu/resctrl/monitor.c     |  813 +---
> >  arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 1130 +-----
> >  arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 4205 +--------------------
> >  arch/x86/kernel/process_32.c              |    2 +-
> >  arch/x86/kernel/process_64.c              |    2 +-
> >  fs/Kconfig                                |    1 +
> >  fs/Makefile                               |    1 +
> >  fs/resctrl/Kconfig                        |   36 +
> >  fs/resctrl/Makefile                       |    3 +
> >  fs/resctrl/ctrlmondata.c                  |  527 +++
> >  fs/resctrl/internal.h                     |  338 ++
> >  fs/resctrl/monitor.c                      |  843 +++++
> >  fs/resctrl/pseudo_lock.c                  | 1122 ++++++
> >  fs/resctrl/rdtgroup.c                     | 4013 ++++++++++++++++++++
> >  include/linux/resctrl.h                   |  157 +-
> >  include/linux/resctrl_types.h             |   98 +
> >  24 files changed, 7402 insertions(+), 7015 deletions(-)
> >  create mode 100644 fs/resctrl/Kconfig
> >  create mode 100644 fs/resctrl/Makefile
> >  create mode 100644 fs/resctrl/ctrlmondata.c
> >  create mode 100644 fs/resctrl/internal.h
> >  create mode 100644 fs/resctrl/monitor.c
> >  create mode 100644 fs/resctrl/pseudo_lock.c
> >  create mode 100644 fs/resctrl/rdtgroup.c
> >  create mode 100644 include/linux/resctrl_types.h
> 
> I was able to build a kernel with the changes and ran through our
> internal suite of functional tests on the following implementations:
> 
> - AMD EPYC 7B12 64-Core Processor
> - Intel(R) Xeon(R) Platinum 8581C
> 
> and the results looked good.
> 
> Tested-by: Peter Newman <peternewman@google.com>
> 
> Thanks!
> 

Great, thanks for the testing!

Cheers
---Dave