[mirror_ubuntu-zesty-kernel.git] / Documentation / numastat.txt


Numa policy hit/miss statistics

/sys/devices/system/node/node*/numastat

All units are pages. Hugepages have separate counters.

numa_hit	A process wanted to allocate memory from this node,
		and succeeded.

numa_miss	A process wanted to allocate memory from another node,
		but ended up with memory from this node.

numa_foreign	A process wanted to allocate on this node,
		but ended up with memory from another one.

local_node	A process ran on this node and got memory from it.

other_node	A process ran on this node and got memory from another node.

interleave_hit 	Interleaving wanted to allocate from this node
		and succeeded.

For easier reading you can use the numastat utility from the numactl package
(http://oss.sgi.com/projects/libnuma/). Note that it only works
well right now on machines with a small number of CPUs.
Commit	Line	Data
	1
	2	Numa policy hit/miss statistics
	3
	4	/sys/devices/system/node/node*/numastat
	5
	6	All units are pages. Hugepages have separate counters.
	7
	8	numa_hit A process wanted to allocate memory from this node,
	9	and succeeded.
	10
	11	numa_miss A process wanted to allocate memory from another node,
	12	but ended up with memory from this node.
	13
	14	numa_foreign A process wanted to allocate on this node,
	15	but ended up with memory from another one.
	16
	17	local_node A process ran on this node and got memory from it.
	18
	19	other_node A process ran on this node and got memory from another node.
	20
	21	interleave_hit Interleaving wanted to allocate from this node
	22	and succeeded.
	23
	24	For easier reading you can use the numastat utility from the numactl package
	25	(http://oss.sgi.com/projects/libnuma/). Note that it only works
	26	well right now on machines with a small number of CPUs.
	27