Re: [PATCH v3 3/3] libnvdimm: Add sysfs numa_node to NVDIMM devices

[Brice Goglin <brice.goglin@gmail.com>]

Do you have local_cpus and local_cpulist attributes as well?
User-space tools such as hwloc use those for binding near I/O devices,
although I guess we could have some CPU-less NVDIMM NUMA nodes?

Brice



Le 19/06/2015 20:18, Toshi Kani a écrit :
> Add support of sysfs 'numa_node' to I/O-related NVDIMM devices
> under /sys/bus/nd/devices, regionN, namespaceN.0, and bttN.
> When bttN is not set up, its numa_node returns -1 (NUMA_NO_NODE).
> 
> An example of numa_node values on a 2-socket system with a single
> NVDIMM range on each socket is shown below.
>   /sys/bus/nd/devices
>   |-- btt0/numa_node:-1
>   |-- btt1/numa_node:0
>   |-- namespace0.0/numa_node:0
>   |-- namespace1.0/numa_node:1
>   |-- region0/numa_node:0
>   |-- region1/numa_node:1
> 
> These numa_node files are then linked under the block class of
> their device names.
>   /sys/class/block/pmem0/device/numa_node:0
>   /sys/class/block/pmem0s/device/numa_node:0
>   /sys/class/block/pmem1/device/numa_node:1
> 
> This enables numactl(8) to accept 'block:' and 'file:' paths of
> pmem and btt devices as shown in the examples below.
>   numactl --preferred block:pmem0 --show
>   numactl --preferred file:/dev/pmem0s --show
> 
> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
> ---
>  drivers/acpi/nfit.c             |    1 +
>  drivers/nvdimm/btt_devs.c       |    1 +
>  drivers/nvdimm/bus.c            |   30 ++++++++++++++++++++++++++++++
>  drivers/nvdimm/namespace_devs.c |    1 +
>  include/linux/libnvdimm.h       |    1 +
>  5 files changed, 34 insertions(+)
> 
> diff --git a/drivers/acpi/nfit.c b/drivers/acpi/nfit.c
> index 5997753..9cb63ac 100644
> --- a/drivers/acpi/nfit.c
> +++ b/drivers/acpi/nfit.c
> @@ -873,6 +873,7 @@ static const struct attribute_group *acpi_nfit_region_attribute_groups[] = {
>  	&nd_region_attribute_group,
>  	&nd_mapping_attribute_group,
>  	&nd_device_attribute_group,
> +	&nd_numa_attribute_group,
>  	&acpi_nfit_region_attribute_group,
>  	NULL,
>  };
> diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
> index bcf77dc..a7b192f 100644
> --- a/drivers/nvdimm/btt_devs.c
> +++ b/drivers/nvdimm/btt_devs.c
> @@ -308,6 +308,7 @@ static struct attribute_group nd_btt_attribute_group = {
>  static const struct attribute_group *nd_btt_attribute_groups[] = {
>  	&nd_btt_attribute_group,
>  	&nd_device_attribute_group,
> +	&nd_numa_attribute_group,
>  	NULL,
>  };
>  
> diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
> index 67525f9..03c0ee1 100644
> --- a/drivers/nvdimm/bus.c
> +++ b/drivers/nvdimm/bus.c
> @@ -420,6 +420,36 @@ struct attribute_group nd_device_attribute_group = {
>  };
>  EXPORT_SYMBOL_GPL(nd_device_attribute_group);
>  
> +static ssize_t numa_node_show(struct device *dev,
> +		struct device_attribute *attr, char *buf)
> +{
> +	return sprintf(buf, "%d\n", dev_to_node(dev));
> +}
> +static DEVICE_ATTR_RO(numa_node);
> +
> +static struct attribute *nd_numa_attributes[] = {
> +	&dev_attr_numa_node.attr,
> +	NULL,
> +};
> +
> +static umode_t nd_numa_attr_visible(struct kobject *kobj, struct attribute *a,
> +		int n)
> +{
> +	if (!IS_ENABLED(CONFIG_NUMA))
> +		return 0;
> +
> +	return a->mode;
> +}
> +
> +/**
> + * nd_numa_attribute_group - NUMA attributes for all devices on an nd bus
> + */
> +struct attribute_group nd_numa_attribute_group = {
> +	.attrs = nd_numa_attributes,
> +	.is_visible = nd_numa_attr_visible,
> +};
> +EXPORT_SYMBOL_GPL(nd_numa_attribute_group);
> +
>  int nvdimm_bus_create_ndctl(struct nvdimm_bus *nvdimm_bus)
>  {
>  	dev_t devt = MKDEV(nvdimm_bus_major, nvdimm_bus->id);
> diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
> index 0fe541a..47f3f29 100644
> --- a/drivers/nvdimm/namespace_devs.c
> +++ b/drivers/nvdimm/namespace_devs.c
> @@ -1141,6 +1141,7 @@ static struct attribute_group nd_namespace_attribute_group = {
>  static const struct attribute_group *nd_namespace_attribute_groups[] = {
>  	&nd_device_attribute_group,
>  	&nd_namespace_attribute_group,
> +	&nd_numa_attribute_group,
>  	NULL,
>  };
>  
> diff --git a/include/linux/libnvdimm.h b/include/linux/libnvdimm.h
> index 30b3dea..75e3af0 100644
> --- a/include/linux/libnvdimm.h
> +++ b/include/linux/libnvdimm.h
> @@ -38,6 +38,7 @@ enum {
>  extern struct attribute_group nvdimm_bus_attribute_group;
>  extern struct attribute_group nvdimm_attribute_group;
>  extern struct attribute_group nd_device_attribute_group;
> +extern struct attribute_group nd_numa_attribute_group;
>  extern struct attribute_group nd_region_attribute_group;
>  extern struct attribute_group nd_mapping_attribute_group;
>  
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