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linux-brain/Documentation/ABI/stable/sysfs-devices-node

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Documentation: ABI: /sys/devices/system/node/ Describe NUMA node sysfs files/attributes. Note that for the specific dates and contacts I couldn't find, I left it as default for Oct 2002 and linux-mm. Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-19 07:23:16 +09:00
What: /sys/devices/system/node/possible
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that could be possibly become online at some point.
What: /sys/devices/system/node/online
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that are online.
What: /sys/devices/system/node/has_normal_memory
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that have regular memory.
What: /sys/devices/system/node/has_cpu
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that have one or more CPUs.
What: /sys/devices/system/node/has_high_memory
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Nodes that have regular or high memory.
Depends on CONFIG_HIGHMEM.
mm: document /sys/devices/system/node/nodeX Add a bare description of what /sys/devices/system/node/nodeX is. Others will follow in time but right now, none of that tree is documented. The existence of this file might at least encourage people to document new entries. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-03-06 06:42:16 +09:00
What: /sys/devices/system/node/nodeX
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
When CONFIG_NUMA is enabled, this is a directory containing
information on node X such as what CPUs are local to the
Documentation: ABI: /sys/devices/system/node/ Describe NUMA node sysfs files/attributes. Note that for the specific dates and contacts I couldn't find, I left it as default for Oct 2002 and linux-mm. Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-19 07:23:16 +09:00
node. Each file is detailed next.
What: /sys/devices/system/node/nodeX/cpumap
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's cpumap.
What: /sys/devices/system/node/nodeX/cpulist
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The CPUs associated to the node.
What: /sys/devices/system/node/nodeX/meminfo
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Provides information about the node's distribution and memory
utilization. Similar to /proc/meminfo, see Documentation/filesystems/proc.txt
What: /sys/devices/system/node/nodeX/numastat
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's hit/miss statistics, in units of pages.
docs: admin-guide: add a series of orphaned documents There are lots of documents that belong to the admin-guide but are on random places (most under Documentation root dir). Move them to the admin guide. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
2019-06-28 02:56:51 +09:00
See Documentation/admin-guide/numastat.rst
Documentation: ABI: /sys/devices/system/node/ Describe NUMA node sysfs files/attributes. Note that for the specific dates and contacts I couldn't find, I left it as default for Oct 2002 and linux-mm. Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-19 07:23:16 +09:00
What: /sys/devices/system/node/nodeX/distance
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
Distance between the node and all the other nodes
in the system.
What: /sys/devices/system/node/nodeX/vmstat
Date: October 2002
Contact: Linux Memory Management list <linux-mm@kvack.org>
Description:
The node's zoned virtual memory statistics.
This is a superset of numastat.
What: /sys/devices/system/node/nodeX/compact
Date: February 2010
Contact: Mel Gorman <mel@csn.ul.ie>
Description:
When this file is written to, all memory within that node
will be compacted. When it completes, memory will be freed
into blocks which have as many contiguous pages as possible
What: /sys/devices/system/node/nodeX/hugepages/hugepages-<size>/
Date: December 2009
Contact: Lee Schermerhorn <lee.schermerhorn@hp.com>
Description:
The node's huge page size control/query attributes.
node: Link memory nodes to their compute nodes Systems may be constructed with various specialized nodes. Some nodes may provide memory, some provide compute devices that access and use that memory, and others may provide both. Nodes that provide memory are referred to as memory targets, and nodes that can initiate memory access are referred to as memory initiators. Memory targets will often have varying access characteristics from different initiators, and platforms may have ways to express those relationships. In preparation for these systems, provide interfaces for the kernel to export the memory relationship among different nodes memory targets and their initiators with symlinks to each other. If a system provides access locality for each initiator-target pair, nodes may be grouped into ranked access classes relative to other nodes. The new interface allows a subsystem to register relationships of varying classes if available and desired to be exported. A memory initiator may have multiple memory targets in the same access class. The target memory's initiators in a given class indicate the nodes access characteristics share the same performance relative to other linked initiator nodes. Each target within an initiator's access class, though, do not necessarily perform the same as each other. A memory target node may have multiple memory initiators. All linked initiators in a target's class have the same access characteristics to that target. The following example show the nodes' new sysfs hierarchy for a memory target node 'Y' with access class 0 from initiator node 'X': # symlinks -v /sys/devices/system/node/nodeX/access0/ relative: /sys/devices/system/node/nodeX/access0/targets/nodeY -> ../../nodeY # symlinks -v /sys/devices/system/node/nodeY/access0/ relative: /sys/devices/system/node/nodeY/access0/initiators/nodeX -> ../../nodeX The new attributes are added to the sysfs stable documentation. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Brice Goglin <Brice.Goglin@inria.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-12 05:56:00 +09:00
See Documentation/admin-guide/mm/hugetlbpage.rst
What: /sys/devices/system/node/nodeX/accessY/
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The node's relationship to other nodes for access class "Y".
What: /sys/devices/system/node/nodeX/accessY/initiators/
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The directory containing symlinks to memory initiator
nodes that have class "Y" access to this target node's
memory. CPUs and other memory initiators in nodes not in
the list accessing this node's memory may have different
performance.
What: /sys/devices/system/node/nodeX/accessY/targets/
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The directory containing symlinks to memory targets that
this initiator node has class "Y" access.
node: Add heterogenous memory access attributes Heterogeneous memory systems provide memory nodes with different latency and bandwidth performance attributes. Provide a new kernel interface for subsystems to register the attributes under the memory target node's initiator access class. If the system provides this information, applications may query these attributes when deciding which node to request memory. The following example shows the new sysfs hierarchy for a node exporting performance attributes: # tree -P "read*|write*"/sys/devices/system/node/nodeY/accessZ/initiators/ /sys/devices/system/node/nodeY/accessZ/initiators/ |-- read_bandwidth |-- read_latency |-- write_bandwidth `-- write_latency The bandwidth is exported as MB/s and latency is reported in nanoseconds. The values are taken from the platform as reported by the manufacturer. Memory accesses from an initiator node that is not one of the memory's access "Z" initiator nodes linked in the same directory may observe different performance than reported here. When a subsystem makes use of this interface, initiators of a different access number may not have the same performance relative to initiators in other access numbers, or omitted from the any access class' initiators. Descriptions for memory access initiator performance access attributes are added to sysfs stable documentation. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Tested-by: Brice Goglin <Brice.Goglin@inria.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-12 05:56:01 +09:00
What: /sys/devices/system/node/nodeX/accessY/initiators/read_bandwidth
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
This node's read bandwidth in MB/s when accessed from
nodes found in this access class's linked initiators.
What: /sys/devices/system/node/nodeX/accessY/initiators/read_latency
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
This node's read latency in nanoseconds when accessed
from nodes found in this access class's linked initiators.
What: /sys/devices/system/node/nodeX/accessY/initiators/write_bandwidth
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
This node's write bandwidth in MB/s when accessed from
found in this access class's linked initiators.
What: /sys/devices/system/node/nodeX/accessY/initiators/write_latency
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
This node's write latency in nanoseconds when access
from nodes found in this class's linked initiators.
node: Add memory-side caching attributes System memory may have caches to help improve access speed to frequently requested address ranges. While the system provided cache is transparent to the software accessing these memory ranges, applications can optimize their own access based on cache attributes. Provide a new API for the kernel to register these memory-side caches under the memory node that provides it. The new sysfs representation is modeled from the existing cpu cacheinfo attributes, as seen from /sys/devices/system/cpu/<cpu>/cache/. Unlike CPU cacheinfo though, the node cache level is reported from the view of the memory. A higher level number is nearer to the CPU, while lower levels are closer to the last level memory. The exported attributes are the cache size, the line size, associativity indexing, and write back policy, and add the attributes for the system memory caches to sysfs stable documentation. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Brice Goglin <Brice.Goglin@inria.fr> Tested-by: Brice Goglin <Brice.Goglin@inria.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-03-12 05:56:02 +09:00
What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The directory containing attributes for the memory-side cache
level 'Y'.
What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/indexing
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The caches associativity indexing: 0 for direct mapped,
non-zero if indexed.
What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/line_size
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The number of bytes accessed from the next cache level on a
cache miss.
What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/size
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The size of this memory side cache in bytes.
What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/write_policy
Date: December 2018
Contact: Keith Busch <keith.busch@intel.com>
Description:
The cache write policy: 0 for write-back, 1 for write-through,
other or unknown.
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