RE: [PATCH v9 09/13] x86/resctrl: Add sysfs interface to read mbm_local_bytes_config

[Moger, Babu]

[AMD Official Use Only - General]

Hi Reinette,

> -----Original Message-----
> From: Reinette Chatre <reinette.chatre@xxxxxxxxx>
> Sent: Thursday, December 15, 2022 11:43 AM
> To: Moger, Babu <Babu.Moger@xxxxxxx>; corbet@xxxxxxx;
> tglx@xxxxxxxxxxxxx; mingo@xxxxxxxxxx; bp@xxxxxxxxx
> Cc: fenghua.yu@xxxxxxxxx; dave.hansen@xxxxxxxxxxxxxxx; x86@xxxxxxxxxx;
> hpa@xxxxxxxxx; paulmck@xxxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx;
> quic_neeraju@xxxxxxxxxxx; rdunlap@xxxxxxxxxxxxx;
> damien.lemoal@xxxxxxxxxxxxxxxxxx; songmuchun@xxxxxxxxxxxxx;
> peterz@xxxxxxxxxxxxx; jpoimboe@xxxxxxxxxx; pbonzini@xxxxxxxxxx;
> chang.seok.bae@xxxxxxxxx; pawan.kumar.gupta@xxxxxxxxxxxxxxx;
> jmattson@xxxxxxxxxx; daniel.sneddon@xxxxxxxxxxxxxxx; Das1, Sandipan
> <Sandipan.Das@xxxxxxx>; tony.luck@xxxxxxxxx; james.morse@xxxxxxx;
> linux-doc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> bagasdotme@xxxxxxxxx; eranian@xxxxxxxxxx; christophe.leroy@xxxxxxxxxx;
> jarkko@xxxxxxxxxx; adrian.hunter@xxxxxxxxx; quic_jiles@xxxxxxxxxxx;
> peternewman@xxxxxxxxxx
> Subject: Re: [PATCH v9 09/13] x86/resctrl: Add sysfs interface to read
> mbm_local_bytes_config
> 
> Hi Babu,
> 
> Same as other commits the subject can be shortened:
> x86/resctrl: Add interface to read mbm_local_bytes_config

Sure.
> 
> On 12/1/2022 7:37 AM, Babu Moger wrote:
> > The current event configuration can be viewed by the user by reading
> > the configuration file /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config.
> > The event configuration settings are domain specific and will affect
> > all the CPUs in the domain.
> >
> > Following are the types of events supported:
> > ====
> ===========================================================
> > Bits   Description
> > ====
> ===========================================================
> > 6      Dirty Victims from the QOS domain to all types of memory
> > 5      Reads to slow memory in the non-local NUMA domain
> > 4      Reads to slow memory in the local NUMA domain
> > 3      Non-temporal writes to non-local NUMA domain
> > 2      Non-temporal writes to local NUMA domain
> > 1      Reads to memory in the non-local NUMA domain
> > 0      Reads to memory in the local NUMA domain
> > ====
> ===========================================================
> >
> > By default, the mbm_local_bytes_config is set to 0x15 to count all the
> > local event types.
> >
> > For example:
> >     $cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config
> >     0=0x15;1=0x15;2=0x15;3=0x15
> >
> >     In this case, the event mbm_local_bytes is currently configured with
> >     0x15 on domains 0 to 3.
> 
> "currently" can be removed

Sure.
> 
> >
> > Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
> > ---
> >  arch/x86/kernel/cpu/resctrl/monitor.c  |    4 +++-
> >  arch/x86/kernel/cpu/resctrl/rdtgroup.c |   16 ++++++++++++++++
> >  2 files changed, 19 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/kernel/cpu/resctrl/monitor.c
> > b/arch/x86/kernel/cpu/resctrl/monitor.c
> > index 2afddebc8636..7c8a3a745041 100644
> > --- a/arch/x86/kernel/cpu/resctrl/monitor.c
> > +++ b/arch/x86/kernel/cpu/resctrl/monitor.c
> > @@ -788,8 +788,10 @@ int __init rdt_get_mon_l3_config(struct
> rdt_resource *r)
> >  			mbm_total_event.configurable = true;
> >  			mbm_config_rftype_init("mbm_total_bytes_config");
> >  		}
> > -		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
> > +		if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL)) {
> >  			mbm_local_event.configurable = true;
> > +			mbm_config_rftype_init("mbm_local_bytes_config");
> > +		}
> >  	}
> >
> >  	l3_mon_evt_init(r);
> > diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > index e93b1c206116..580f3cce19e2 100644
> > --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
> > @@ -1507,6 +1507,16 @@ static int mbm_total_bytes_config_show(struct
> kernfs_open_file *of,
> >  	return 0;
> >  }
> >
> > +static int mbm_local_bytes_config_show(struct kernfs_open_file *of,
> > +				       struct seq_file *seq, void *v) {
> > +	struct rdt_resource *r = of->kn->parent->priv;
> > +
> > +	mbm_config_show(seq, r, QOS_L3_MBM_LOCAL_EVENT_ID);
> > +
> > +	return 0;
> > +}
> > +
> >  /* rdtgroup information files for one cache resource. */  static
> > struct rftype res_common_files[] = {
> >  	{
> > @@ -1611,6 +1621,12 @@ static struct rftype res_common_files[] = {
> >  		.kf_ops		= &rdtgroup_kf_single_ops,
> >  		.seq_show	= mbm_total_bytes_config_show,
> >  	},
> > +	{
> > +		.name		= "mbm_local_bytes_config",
> > +		.mode		= 0444,
> > +		.kf_ops		= &rdtgroup_kf_single_ops,
> > +		.seq_show	= mbm_local_bytes_config_show,
> > +	},
> >  	{
> >  		.name		= "cpus",
> >  		.mode		= 0644,
> >
> >
> 
> With the subject and changelog changes addressed:
> 
> Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>

Thanks
Babu
> 
> Reinette