Hugepages Input Plugin

This plugin gathers metrics from the Linux' Transparent Huge Pages (THP) memory management system that reduces the overhead of Translation Lookaside Buffer (TLB) lookups on machines with large amounts of memory.

Introduced in: Telegraf v1.22.0 Tags: system OS support: linux

Global configuration options

Plugins support additional global and plugin configuration settings for tasks such as modifying metrics, tags, and fields, creating aliases, and configuring plugin ordering. See CONFIGURATION.md for more details.

Configuration

# Gathers huge pages measurements.
# This plugin ONLY supports Linux
[[inputs.hugepages]]
  ## Supported huge page types:
  ##   - "root"     - based on root huge page control directory:
  ##                  /sys/kernel/mm/hugepages
  ##   - "per_node" - based on per NUMA node directories:
  ##                  /sys/devices/system/node/node[0-9]*/hugepages
  ##   - "meminfo"  - based on /proc/meminfo file
  # types = ["root", "per_node"]

Metrics

Measurements

The following measurements are supported by Hugepages plugin:

• hugepages_root (gathered from /sys/kernel/mm/hugepages)
  • tags:
    • size_kb (integer, kB)
  • fields:
    • free (integer)
    • mempolicy (integer)
    • overcommit (integer)
    • reserved (integer)
    • surplus (integer)
    • total (integer)
• hugepages_per_node (gathered from /sys/devices/system/node/node[0-9]*/hugepages)
  • tags:
    • size_kb (integer, kB)
    • node (integer)
  • fields:
    • free (integer)
    • surplus (integer)
    • total (integer)
• hugepages_meminfo (gathered from /proc/meminfo file)
  • The fields total, free, reserved, and surplus are counts of pages of default size. Fields with suffix _kb are in kilobytes.
  • fields:
    • anonymous_kb (integer, kB)
    • file_kb (integer, kB)
    • free (integer)
    • reserved (integer)
    • shared_kb (integer, kB)
    • size_kb (integer, kB)
    • surplus (integer)
    • tlb_kb (integer, kB)
    • total (integer)

Example Output

hugepages_root,host=ubuntu,size_kb=1048576 free=0i,mempolicy=8i,overcommit=0i,reserved=0i,surplus=0i,total=8i 1646258020000000000
hugepages_root,host=ubuntu,size_kb=2048 free=883i,mempolicy=2048i,overcommit=0i,reserved=0i,surplus=0i,total=2048i 1646258020000000000
hugepages_per_node,host=ubuntu,size_kb=1048576,node=0 free=0i,surplus=0i,total=4i 1646258020000000000
hugepages_per_node,host=ubuntu,size_kb=2048,node=0 free=434i,surplus=0i,total=1024i 1646258020000000000
hugepages_per_node,host=ubuntu,size_kb=1048576,node=1 free=0i,surplus=0i,total=4i 1646258020000000000
hugepages_per_node,host=ubuntu,size_kb=2048,node=1 free=449i,surplus=0i,total=1024i 1646258020000000000
hugepages_meminfo,host=ubuntu anonymous_kb=0i,file_kb=0i,free=883i,reserved=0i,shared_kb=0i,size_kb=2048i,surplus=0i,tlb_kb=12582912i,total=2048i 1646258020000000000