linux-kernel - RE: [RFC PATCH 0/7] Add driver registration i/f to resctrl

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Date:   Wed, 10 May 2023 00:52:18 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Chatre, Reinette" <reinette.chatre@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Shaopeng Tan <tan.shaopeng@...itsu.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        James Morse <james.morse@....com>,
        Babu Moger <babu.moger@....com>
CC:     "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH 0/7] Add driver registration i/f to resctrl

> It is hard to tell from just a diffstat how this implementation impacts
> the core. A similar diffstat for the driver implementation may
> help. "1300 insertions(+), 10 deletions(-)" does not seem like a lot of 
> core refactoring.

Here's the resctrl bits of Fenghua's diffstat (with the filename of the new
feature changed to avoid giving too much away):

 arch/x86/kernel/cpu/resctrl/core.c        |  39 +++-
 arch/x86/kernel/cpu/resctrl/newfeature.c  | 780 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 arch/x86/kernel/cpu/resctrl/monitor.c     |   4 +-
 arch/x86/kernel/cpu/resctrl/rdtgroup.c    | 333 ++++++++++++++++++++++++++++-

Changes to core files are ~375 lines ... about 50% more than I added to core code
to provide a registration hook for this and many other drivers.  My driver registration
hooks will likely inflate by that much when the rough edges are smoothed.

-Tony