2022-03-17 00:00:45 +08:00
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# Hugepages Input Plugin
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Transparent Huge Pages (THP) is a Linux memory management system that reduces the overhead of
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Translation Lookaside Buffer (TLB) lookups on machines with large amounts of memory by using larger
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memory pages.
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Consult <https://www.kernel.org/doc/html/latest/admin-guide/mm/hugetlbpage.html> for more details.
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## Configuration
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2022-05-24 21:49:47 +08:00
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```toml @sample.conf
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2022-03-17 00:00:45 +08:00
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# Gathers huge pages measurements.
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[[inputs.hugepages]]
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## Supported huge page types:
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## - "root" - based on root huge page control directory: /sys/kernel/mm/hugepages
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## - "per_node" - based on per NUMA node directories: /sys/devices/system/node/node[0-9]*/hugepages
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## - "meminfo" - based on /proc/meminfo file
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# types = ["root", "per_node"]
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```
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## Measurements
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**The following measurements are supported by Hugepages plugin:**
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- hugepages_root (gathered from root huge page control directory: `/sys/kernel/mm/hugepages`)
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- tags:
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- size_kb (integer, kB)
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- fields:
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- free (integer)
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- mempolicy (integer)
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- overcommit (integer)
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- reserved (integer)
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- surplus (integer)
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- total (integer)
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- hugepages_per_node (gathered from per NUMA node directories: `/sys/devices/system/node/node[0-9]*/hugepages`)
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- tags:
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- size_kb (integer, kB)
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- node (integer)
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- fields:
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- free (integer)
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- surplus (integer)
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- total (integer)
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- hugepages_meminfo (gathered from `/proc/meminfo` file)
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- The fields `total`, `free`, `reserved`, and `surplus` are counts of pages of default size. Fields with suffix `_kb` are in kilobytes.
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- fields:
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- anonymous_kb (integer, kB)
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- file_kb (integer, kB)
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- free (integer)
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- reserved (integer)
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- shared_kb (integer, kB)
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- size_kb (integer, kB)
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- surplus (integer)
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- tlb_kb (integer, kB)
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- total (integer)
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## Example Output
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```text
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$ ./telegraf -config telegraf.conf -input-filter hugepages -test
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> hugepages_root,host=ubuntu,size_kb=1048576 free=0i,mempolicy=8i,overcommit=0i,reserved=0i,surplus=0i,total=8i 1646258020000000000
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> hugepages_root,host=ubuntu,size_kb=2048 free=883i,mempolicy=2048i,overcommit=0i,reserved=0i,surplus=0i,total=2048i 1646258020000000000
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> hugepages_per_node,host=ubuntu,size_kb=1048576,node=0 free=0i,surplus=0i,total=4i 1646258020000000000
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> hugepages_per_node,host=ubuntu,size_kb=2048,node=0 free=434i,surplus=0i,total=1024i 1646258020000000000
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> hugepages_per_node,host=ubuntu,size_kb=1048576,node=1 free=0i,surplus=0i,total=4i 1646258020000000000
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> hugepages_per_node,host=ubuntu,size_kb=2048,node=1 free=449i,surplus=0i,total=1024i 1646258020000000000
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> 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
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```
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