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

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Message-ID: <1433953236.23540.236.camel@misato.fc.hp.com>
Date:	Wed, 10 Jun 2015 10:20:36 -0600
From:	Toshi Kani <toshi.kani@...com>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Jeff Moyer <jmoyer@...hat.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-nvdimm <linux-nvdimm@...1.01.org>
Subject: Re: [PATCH v2 0/3] Add NUMA support for NVDIMM devices

On Wed, 2015-06-10 at 08:57 -0700, Dan Williams wrote:
> On Wed, Jun 10, 2015 at 8:54 AM, Jeff Moyer <jmoyer@...hat.com> wrote:
> > Toshi Kani <toshi.kani@...com> writes:
> >
> >> 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>
> >
> > Did you post the patches to numactl somewhere?
> >
> 
> numactl already supports this today.

Yes, numactl supports the following sysfs class lookup for numa_node.
This patchset adds numa_node for NVDIMM devices in the same sysfs format
as described in patch 3/3.

   /* Generic sysfs class lookup */
   static int
   affinity_class(struct bitmask *mask, char *cls, const char *dev)
   {
		:
        ret = sysfs_node_read(mask, "/sys/class/%s/%s/device/numa_node",
                              cls, dev);

Thanks,
-Toshi

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