Service graphs

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Graph Information

This graph shows what the machine uses its memory for.

Field Internal name Type Warn Crit Info
apps apps gauge     Memory used by user-space applications.
page_tables page_tables gauge     Memory used to map between virtual and physical memory addresses.
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.
vmalloc_used vmalloc_used gauge     Virtual memory used by the kernel (used when the memory does not have to be physically contigious).
slab_cache slab gauge     Memory used by the kernel (major users are caches like inode, dentry, etc).
cache cached gauge     Parked file data (file content) cache.
buffers buffers gauge     Block device (e.g. harddisk) cache. Also where "dirty" blocks are stored until written.
unused free gauge     Wasted memory. Memory that is not used for anything at all.
swap swap gauge     Swap space used.
committed committed gauge     The amount of memory that would be used if all the memory that's been allocated were to be used.
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.