linux-kernel - Re: [PATCH v6 13/24] x86/resctrl: Queue mon_event

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Message-ID: <57554be0-5be8-ee03-a9dc-88deaac43453@intel.com>
Date:   Tue, 3 Oct 2023 14:17:51 -0700
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     James Morse <james.morse@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     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>, <amitsinght@...vell.com>
Subject: Re: [PATCH v6 13/24] x86/resctrl: Queue mon_event_read() instead of
 sending an IPI

Hi James,

On 9/14/2023 10:21 AM, James Morse wrote:

...
 
> diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> index b44c487727d4..bd263b9a0abd 100644
> --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> @@ -19,6 +19,7 @@
>  #include <linux/kernfs.h>
>  #include <linux/seq_file.h>
>  #include <linux/slab.h>
> +#include <linux/tick.h>
>  #include "internal.h"
>  

Please keep the empty line between groups of header files.

>  /*
> @@ -520,12 +521,24 @@ int rdtgroup_schemata_show(struct kernfs_open_file *of,
>  	return ret;
>  }
>  
> +static int smp_mon_event_count(void *arg)
> +{
> +	mon_event_count(arg);
> +
> +	return 0;
> +}
> +
>  void mon_event_read(struct rmid_read *rr, struct rdt_resource *r,
>  		    struct rdt_domain *d, struct rdtgroup *rdtgrp,
>  		    int evtid, int first)
>  {
> +	int cpu;
> +
> +	/* When picking a CPU from cpu_mask, ensure it can't race with cpuhp */

This comment is not accurate at this point. It should accompany the code it applies to.

> +	lockdep_assert_held(&rdtgroup_mutex);
> +
>  	/*
> -	 * setup the parameters to send to the IPI to read the data.
> +	 * Setup the parameters to pass to mon_event_count() to read the data.
>  	 */
>  	rr->rgrp = rdtgrp;
>  	rr->evtid = evtid;


Reinette