Service graphs
Graph Information
This graph shows what the machine uses memory for.
| Field |
Internal name |
Type |
Warn |
Crit |
Info |
| apps |
apps |
gauge |
|
|
Memory used by user-space applications. |
| free |
free |
gauge |
|
|
Wasted memory. Memory that is not used for anything at all. |
| swap |
swap |
gauge |
|
|
Swap space used. |
| buffers |
buffers |
gauge |
|
|
Block device (e.g. harddisk) cache. Also where "dirty" blocks are stored until written. |
| cache |
cached |
gauge |
|
|
Parked file data (file content) cache. |
| shmem |
shmem |
gauge |
|
|
Shared Memory (SYSV SHM segments, tmpfs). |
| slab_cache |
slab_cache |
gauge |
|
|
Memory used by the kernel (major users are caches like inode, dentry, etc). |
| swap_cache |
swap_cache |
gauge |
|
|
A piece of memory that keeps track of pages that have been fetched from swap but not yet been modified. |
| page_tables |
page_tables |
gauge |
|
|
Memory used to map between virtual and physical memory addresses. |
| vmalloc_used |
vmalloc_used |
gauge |
|
|
'VMalloc' (kernel) memory used. |
| committed |
committed |
gauge |
|
|
The amount of memory allocated to programs. Overcommitting is normal, but may indicate memory leaks. |
| mapped |
mapped |
gauge |
|
|
All mmap()ed pages. |
| active |
active |
gauge |
|
|
Memory recently used. Not reclaimed unless absolutely necessary. |
| inactive |
inactive |
gauge |
|
|
Memory not currently used. |
