| 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. | |
| 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 | |
| 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.rst | |
| 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. | |
| See Documentation/admin-guide/numastat.rst | |
| 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. | |
| 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. | |
| 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. | |
| 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. | |
| What: /sys/devices/system/node/nodeX/memory_side_cache/indexY/address_mode | |
| Date: March 2025 | |
| Contact: Dave Jiang <dave.jiang@intel.com> | |
| Description: | |
| The address mode: 0 for reserved, 1 for extended-linear. | |
| What: /sys/devices/system/node/nodeX/x86/sgx_total_bytes | |
| Date: November 2021 | |
| Contact: Jarkko Sakkinen <jarkko@kernel.org> | |
| Description: | |
| The total amount of SGX physical memory in bytes. | |
| What: /sys/devices/system/node/nodeX/memory_failure/total | |
| Date: January 2023 | |
| Contact: Jiaqi Yan <jiaqiyan@google.com> | |
| Description: | |
| The total number of raw poisoned pages (pages containing | |
| corrupted data due to memory errors) on a NUMA node. | |
| What: /sys/devices/system/node/nodeX/memory_failure/ignored | |
| Date: January 2023 | |
| Contact: Jiaqi Yan <jiaqiyan@google.com> | |
| Description: | |
| Of the raw poisoned pages on a NUMA node, how many pages are | |
| ignored by memory error recovery attempt, usually because | |
| support for this type of pages is unavailable, and kernel | |
| gives up the recovery. | |
| What: /sys/devices/system/node/nodeX/memory_failure/failed | |
| Date: January 2023 | |
| Contact: Jiaqi Yan <jiaqiyan@google.com> | |
| Description: | |
| Of the raw poisoned pages on a NUMA node, how many pages are | |
| failed by memory error recovery attempt. This usually means | |
| a key recovery operation failed. | |
| What: /sys/devices/system/node/nodeX/memory_failure/delayed | |
| Date: January 2023 | |
| Contact: Jiaqi Yan <jiaqiyan@google.com> | |
| Description: | |
| Of the raw poisoned pages on a NUMA node, how many pages are | |
| delayed by memory error recovery attempt. Delayed poisoned | |
| pages usually will be retried by kernel. | |
| What: /sys/devices/system/node/nodeX/memory_failure/recovered | |
| Date: January 2023 | |
| Contact: Jiaqi Yan <jiaqiyan@google.com> | |
| Description: | |
| Of the raw poisoned pages on a NUMA node, how many pages are | |
| recovered by memory error recovery attempt. | |
| What: /sys/devices/system/node/nodeX/reclaim | |
| Date: June 2025 | |
| Contact: Linux Memory Management list <linux-mm@kvack.org> | |
| Description: | |
| Perform user-triggered proactive reclaim on a NUMA node. | |
| This interface is equivalent to the memcg variant. | |
| See Documentation/admin-guide/cgroup-v2.rst |