telegraf/plugins/inputs/hugepages

Hugepages Input Plugin

Transparent Huge Pages (THP) is a Linux memory management system that reduces the overhead of Translation Lookaside Buffer (TLB) lookups on machines with large amounts of memory by using larger memory pages.

Consult https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html for more details.

Configuration

# Gathers huge pages measurements.
[[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"]

Measurements

The following measurements are supported by Hugepages plugin:

• hugepages_root (gathered from root huge page control directory: /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 per NUMA node directories: /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

$ ./telegraf -config telegraf.conf -input-filter hugepages -test
> 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