linux-kernel - RE: [PATCH 01/18] x86/resctrl: Track the closid with the rmid

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Date:   Tue, 10 Jan 2023 18:01:49 +0000
From:   "Yu, Fenghua" <fenghua.yu@...el.com>
To:     James Morse <james.morse@....com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "Chatre, Reinette" <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>,
        "carl@...amperecomputing.com" <carl@...amperecomputing.com>,
        "lcherian@...vell.com" <lcherian@...vell.com>,
        "bobo.shaobowang@...wei.com" <bobo.shaobowang@...wei.com>,
        "tan.shaopeng@...itsu.com" <tan.shaopeng@...itsu.com>,
        Jamie Iles <quic_jiles@...cinc.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>,
        "peternewman@...gle.com" <peternewman@...gle.com>
Subject: RE: [PATCH 01/18] x86/resctrl: Track the closid with the rmid

Hi, James,

> >> a/arch/x86/kernel/cpu/resctrl/monitor.c
> >> b/arch/x86/kernel/cpu/resctrl/monitor.c
> >> index efe0c30d3a12..f1f66c9942a5 100644
> >> --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> >> +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> >> @@ -25,6 +25,7 @@
> >>  #include "internal.h"
> >>
> >>  struct rmid_entry {
> >> +	u32				closid;
> >
> > Could you please add a comment for this closid field? It's expected to be form
> x86 RMID entry.
> > So it's deserved a comment to explain a bit more on this field.
> 
> Sure ... what does it need to convey?
> I'm not sure what you mean by "expected to be form x86 RMID entry".

My typo, should be "not expected".

> 
> My medium verbosity version looks like this:
> |        /*
> |         * Some architectures's resctrl_arch_rmid_read() needs the CLOSID value
> |         * in order to access the correct monitor. This field provides the
> |         * value to list walkers like __check_limbo(). On x86 this is ignored.
> |         */
> 
> 
> Does this cover it?

Looks good to me.

Thanks.

-Fenghua