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Date: Tue, 17 Nov 2020 11:22:08 -0800
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>,
shameerali.kolothum.thodi@...wei.com,
Jamie Iles <jamie@...iainc.com>,
D Scott Phillips OS <scott@...amperecomputing.com>
Subject: Re: [PATCH 02/24] x86/resctrl: Split struct rdt_domain
Hi James,
On 10/30/2020 9:10 AM, James Morse wrote:
> resctrl is the defacto Linux ABI for SoC resource partitioning features.
> To support it on another architecture, it needs to be abstracted from
> Intel RDT, and moved it to /fs/.
Same comments as previous patch regarding "Intel RDT" and "moved it to"
>
> Split struct rdt_domain up too. Move everything that that is particular
s/that that/that/
> to resctrl into a new header file. resctrl code paths touching a 'hw'
> struct indicates where an abstraction is needed.
>
> No change in behaviour, this patch just moves types around.
Please remove the "this patch" term.
>
> Signed-off-by: James Morse <james.morse@....com>
> ---
> arch/x86/kernel/cpu/resctrl/core.c | 32 +++++++++++-------
> arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 10 ++++--
> arch/x86/kernel/cpu/resctrl/internal.h | 40 +++++------------------
> arch/x86/kernel/cpu/resctrl/monitor.c | 8 +++--
> arch/x86/kernel/cpu/resctrl/rdtgroup.c | 29 ++++++++++------
> include/linux/resctrl.h | 35 +++++++++++++++++++-
> 6 files changed, 94 insertions(+), 60 deletions(-)
>
...
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index bcae86138cad..f7aab9245259 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -299,44 +299,22 @@ struct mbm_state {
> };
>
> /**
> - * struct rdt_domain - group of cpus sharing an RDT resource
> - * @list: all instances of this resource
> - * @id: unique id for this instance
> - * @cpu_mask: which cpus share this resource
> - * @rmid_busy_llc:
> - * bitmap of which limbo RMIDs are above threshold
> - * @mbm_total: saved state for MBM total bandwidth
> - * @mbm_local: saved state for MBM local bandwidth
> - * @mbm_over: worker to periodically read MBM h/w counters
> - * @cqm_limbo: worker to periodically read CQM h/w counters
> - * @mbm_work_cpu:
> - * worker cpu for MBM h/w counters
> - * @cqm_work_cpu:
> - * worker cpu for CQM h/w counters
> + * struct rdt_hw_domain - group of cpus sharing an RDT resource
s/RDT/resctrl/?
Even so, looking ahead, struct rdt_hw_domain and struct rdt_domain are
receiving duplicate descriptions that needs to be adjusted.
Also, CPU is preferred instead of cpu. I understand that in some cases
you copy existing usage and I am actually not sure if this would be
insisted upon when going to the next level of review. Since these are
comments changing it does seem like a good time to use preferred term.
> + * @resctrl: Properties exposed to the resctrl file system
Please use tabs and spaces consistently.
> * @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
> * @mbps_val: When mba_sc is enabled, this holds the bandwidth in MBps
> - * @new_ctrl: new ctrl value to be loaded
> - * @have_new_ctrl: did user provide new_ctrl for this domain
> - * @plr: pseudo-locked region (if any) associated with domain
> */
> -struct rdt_domain {
> - struct list_head list;
> - int id;
> - struct cpumask cpu_mask;
> - unsigned long *rmid_busy_llc;
> - struct mbm_state *mbm_total;
> - struct mbm_state *mbm_local;
> - struct delayed_work mbm_over;
> - struct delayed_work cqm_limbo;
> - int mbm_work_cpu;
> - int cqm_work_cpu;
> +struct rdt_hw_domain {
> + struct rdt_domain resctrl;
> u32 *ctrl_val;
> u32 *mbps_val;
> - u32 new_ctrl;
> - bool have_new_ctrl;
> - struct pseudo_lock_region *plr;
> };
>
> +static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
> +{
> + return container_of(r, struct rdt_hw_domain, resctrl);
> +}
> +
> /**
> * struct msr_param - set a range of MSRs from a domain
> * @res: The resource to use
...
> diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
> index b2c2b7386d28..f5af59b8f2a9 100644
> --- a/include/linux/resctrl.h
> +++ b/include/linux/resctrl.h
> @@ -15,7 +15,40 @@ int proc_resctrl_show(struct seq_file *m,
>
> #endif
>
> -struct rdt_domain;
> +/**
> + * struct rdt_domain - group of cpus sharing an RDT resource
Duplicate description here (same as rdt_hw_domain). Please use CPUs
instead and resctrl instead of RDT.
> + * @list: all instances of this resource
> + * @id: unique id for this instance
> + * @cpu_mask: which cpus share this resource
> + * @new_ctrl: new ctrl value to be loaded
> + * @have_new_ctrl: did user provide new_ctrl for this domain
> + * @rmid_busy_llc: bitmap of which limbo RMIDs are above threshold
> + * @mbm_total: saved state for MBM total bandwidth
> + * @mbm_local: saved state for MBM local bandwidth
> + * @mbm_over: worker to periodically read MBM h/w counters
> + * @cqm_limbo: worker to periodically read CQM h/w counters
> + * @mbm_work_cpu: worker cpu for MBM h/w counters
> + * @cqm_work_cpu: worker cpu for CQM h/w counters
> + * @plr: pseudo-locked region (if any) associated with domain
> + */
The above usages of cpu is what I considered earlier. I know that the
x86 area prefers CPU but I also understand that you are just copying
existing comments. I do not know if the x86 maintainers would require a
change to CPU at this time but it seems like a good time to transition.
> +struct rdt_domain {
> + struct list_head list;
> + int id;
> + struct cpumask cpu_mask;
> +
> + u32 new_ctrl;
> + bool have_new_ctrl;
> +
> + unsigned long *rmid_busy_llc;
> + struct mbm_state *mbm_total;
> + struct mbm_state *mbm_local;
> + struct delayed_work mbm_over;
> + struct delayed_work cqm_limbo;
> + int mbm_work_cpu;
> + int cqm_work_cpu;
> +
> + struct pseudo_lock_region *plr;
> +};
>
Please remove the empty lines.
> /**
> * struct resctrl_cache - Cache allocation related data
>
Reinette
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