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From: Dan Williams <dan.j.williams@intel.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: linux-nvdimm <linux-nvdimm@lists.01.org>,
	Ira Weiny <ira.weiny@intel.com>,
	Michael Ellerman <mpe@ellerman.id.au>,
	"Oliver O'Halloran" <oohall@gmail.com>,
	Vishal Verma <vishal.l.verma@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH 04/16] libnvdimm: Move nd_numa_attribute_group to device_type
Date: Tue, 12 Nov 2019 22:14:04 -0800	[thread overview]
Message-ID: <CAPcyv4iB1r7FAYEm_+vtj_BGS1k6Cu_2xG7tH9O601zrk2wNXw@mail.gmail.com> (raw)
In-Reply-To: <738e328b-9a9b-b297-8379-f0d72d06c5c9@linux.ibm.com>

On Tue, Nov 12, 2019 at 10:02 PM Aneesh Kumar K.V
<aneesh.kumar@linux.ibm.com> wrote:
>
> On 11/13/19 6:56 AM, Dan Williams wrote:
> > On Tue, Nov 12, 2019 at 1:23 AM Aneesh Kumar K.V
> > <aneesh.kumar@linux.ibm.com> wrote:
> >>
> >> Dan Williams <dan.j.williams@intel.com> writes:
> >>
> >>> A 'struct device_type' instance can carry default attributes for the
> >>> device. Use this facility to remove the export of
> >>> nd_numa_attribute_group and put the responsibility on the core rather
> >>> than leaf implementations to define this attribute.
> >>>
> >>> Cc: Ira Weiny <ira.weiny@intel.com>
> >>> Cc: Michael Ellerman <mpe@ellerman.id.au>
> >>> Cc: "Oliver O'Halloran" <oohall@gmail.com>
> >>> Cc: Vishal Verma <vishal.l.verma@intel.com>
> >>> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
> >>> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> >>
> >>
> >> can we also expose target_node in a similar way? This allows application
> >> to better understand the node locality of the SCM device.
> >
> > It is already exported for device-dax instances. See
> > DEVICE_ATTR_RO(target_node) in drivers/dax/bus.c. I did not see a use
> > case for it to be exported for other nvdimm device types.
> >
>
> some applications do want to access the fsdax namspace as different
> mount points based on numa affinity. If can differentiate the two
> regions with different target_node and same numa_node, that will help
> them better isolate these mounts.

Can you be more explicit than "some", and what's the impact if the
kernel continues with the status quo and does not export this data?
I'm trying to come up with the justification to include into the
changelog that adds that information.

At least on the pmem platforms I am working with the pmem ranges with
different target nodes also appear on different numa nodes so there is
no incremental benefit for target node there.

  reply	other threads:[~2019-11-13  6:14 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-07  3:56 [PATCH 00/16] Memory Hierarchy: Enable target node lookups for reserved memory Dan Williams
2019-11-07  3:56 ` [PATCH 01/16] libnvdimm: Move attribute groups to device type Dan Williams
2019-11-12 11:28   ` Aneesh Kumar K.V
2019-11-07  3:56 ` [PATCH 02/16] libnvdimm: Move region attribute group definition Dan Williams
2019-11-12 11:29   ` Aneesh Kumar K.V
2019-11-07  3:56 ` [PATCH 03/16] libnvdimm: Move nd_device_attribute_group to device_type Dan Williams
2019-11-12 11:30   ` Aneesh Kumar K.V
2019-11-07  3:56 ` [PATCH 04/16] libnvdimm: Move nd_numa_attribute_group " Dan Williams
2019-11-12  9:22   ` Aneesh Kumar K.V
2019-11-13  1:26     ` Dan Williams
2019-11-13  6:02       ` Aneesh Kumar K.V
2019-11-13  6:14         ` Dan Williams [this message]
2019-11-07  3:57 ` [PATCH 05/16] libnvdimm: Move nd_region_attribute_group " Dan Williams
2019-11-12 11:45   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 06/16] libnvdimm: Move nd_mapping_attribute_group " Dan Williams
2019-11-12 11:45   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 07/16] libnvdimm: Move nvdimm_attribute_group " Dan Williams
2019-11-12 11:48   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 08/16] libnvdimm: Move nvdimm_bus_attribute_group " Dan Williams
2019-11-12 11:48   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 09/16] dax: Create a dax device_type Dan Williams
2019-11-12 11:49   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 10/16] dax: Simplify root read-only definition for the 'resource' attribute Dan Williams
2019-11-12 11:49   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 11/16] libnvdimm: " Dan Williams
2019-11-12 11:50   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 12/16] dax: Add numa_node to the default device-dax attributes Dan Williams
2019-11-12 11:50   ` Aneesh Kumar K.V
2019-11-07  3:57 ` [PATCH 13/16] acpi/mm: Up-level "map to online node" functionality Dan Williams
2019-11-11 11:30   ` Aneesh Kumar K.V
2019-11-11 23:38     ` Dan Williams
2019-11-07  3:57 ` [PATCH 14/16] x86/numa: Provide a range-to-target_node lookup facility Dan Williams
2019-11-07  3:57 ` [PATCH 15/16] libnvdimm/e820: Drop the wrapper around memory_add_physaddr_to_nid Dan Williams
2019-11-07  3:58 ` [PATCH 16/16] libnvdimm/e820: Retrieve and populate correct 'target_node' info Dan Williams
2019-11-09  5:02   ` kbuild test robot
2019-11-12 11:42 ` [PATCH 00/16] Memory Hierarchy: Enable target node lookups for reserved memory Aneesh Kumar K.V
2019-11-12 19:37   ` Dan Williams

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