linux-kernel - Re: [PATCH v5 06/24] x86/resctrl: Track the number of dirty RMID a CLOSID has

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Date:   Wed, 30 Aug 2023 15:32:42 -0700
From:   Tony Luck <tony.luck@...el.com>
To:     James Morse <james.morse@....com>
Cc:     Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, 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,
        xingxin.hx@...nanolis.org, baolin.wang@...ux.alibaba.com,
        Jamie Iles <quic_jiles@...cinc.com>,
        Xin Hao <xhao@...ux.alibaba.com>, peternewman@...gle.com,
        dfustini@...libre.com
Subject: Re: [PATCH v5 06/24] x86/resctrl: Track the number of dirty RMID a
 CLOSID has

On Thu, Aug 24, 2023 at 05:53:03PM +0100, James Morse wrote:
> Something on my eternal-todo-list is to make the filesystem parts of resctrl a loadable
> module (if Tony doesn't get there first!). That would flush this sort of thing out.
> Last time I triggered resctrl_exit() manually not all of the files got cleaned up - I
> haven't investigated it further.

James,

I looked at going to a full loadable module approach for about 3 seconds,
and found none of the kernfs support functions are exported. So I also
put that on the eternal-todo-list :-)

There are possibly a few other functions that need exporting like
get_cpu_cacheinfo(), and two or three others from the "perf"
code for pseudo-lock debugfs support.

-Tony

P.S. Latest version of my re-write is at:

https://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git/log/?h=resctrl2_v65rc7

Well, almost latest. I haven't pushed the changes to auto-load all the
modules for basic X86 functions based on X86_FEATURE_* bits.