linux-kernel - Re: [PATCH v2 0/3] Add NUMA support for NVDIMM devices

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Message-ID: <CAPcyv4jJv1df39W9YjP3FCeZDzZKOsV70xK9gbteykEUJVyDwQ@mail.gmail.com>
Date:	Thu, 11 Jun 2015 08:38:18 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Toshi Kani <toshi.kani@...com>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rafael J Wysocki <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH v2 0/3] Add NUMA support for NVDIMM devices

On Tue, Jun 9, 2015 at 4:10 PM, Toshi Kani <toshi.kani@...com> wrote:
> Since NVDIMMs are installed on memory slots, they expose the NUMA
> topology of a platform.  This patchset adds support of sysfs
> 'numa_node' to I/O-related NVDIMM devices under /sys/bus/nd/devices.
> 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
>
> numactl can be used to bind an application to the locality of
> a target NVDIMM for better performance.  Here is a result of fio
> benchmark to ext4/dax on an HP DL380 with 2 sockets for local and
> remote settings.
>
>   Local [1] :  4098.3MB/s
>   Remote [2]:  3718.4MB/s
>
> [1] numactl --preferred block:pmem0 --cpunodebind block:pmem0 fio <fs-on-pmem0>
> [2] numactl --preferred block:pmem1 --cpunodebind block:pmem1 fio <fs-on-pmem0>
>
> Patch 1/3 applies on top of the acpica branch of the pm tree.
> Patch 2/3-3/3 apply on top of Dan Williams's v5 patch series of
> "libnvdimm: non-volatile memory devices".
>
> ---
> v2:
>  - Add acpi_map_pxm_to_online_node(), which returns an online node.
>  - Manage visibility of sysfs numa_node with is_visible. (Dan Williams)
>  - Check ACPI_NFIT_PROXIMITY_VALID in spa->flags.
>
> ---
> Toshi Kani (3):
>   1/3 acpi: Add acpi_map_pxm_to_online_node()
>   2/3 libnvdimm: Set numa_node to NVDIMM devices
>   3/3 libnvdimm: Add sysfs numa_node to NVDIMM devices

Looks good to me.  Once Rafael acks the ACPI core changes I'll pull it
in to libnvdimm-for-next.
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