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In Documentation/numastat.txt, it confused me. For example, there are nodes [0,1] in system. barrios:~$ cat /proc/zoneinfo | egrep 'numa|zone' Node 0, zone DMA numa_hit 33226 numa_miss 1739 numa_foreign 27978 .. .. Node 1, zone DMA numa_hit 307 numa_miss 46900 numa_foreign 0 1) In node 0, NUMA_MISS means it wanted to allocate page in node 1 but ended up with page in node 0 2) In node 0, NUMA_FOREIGN means it wanted to allocate page in node 0 but ended up with page from Node 1. But now, numastat explains it oppositely about (MISS, FOREIGN). Let's fix up with viewpoint of zone. Signed-off-by: Minchan Kim <minchan.kim@gmail.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
23 lines
866 B
Plaintext
23 lines
866 B
Plaintext
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Numa policy hit/miss statistics
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/sys/devices/system/node/node*/numastat
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All units are pages. Hugepages have separate counters.
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numa_hit A process wanted to allocate memory from this node,
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and succeeded.
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numa_miss A process wanted to allocate memory from another node,
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but ended up with memory from this node.
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numa_foreign A process wanted to allocate on this node,
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but ended up with memory from another one.
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local_node A process ran on this node and got memory from it.
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other_node A process ran on this node and got memory from another node.
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interleave_hit Interleaving wanted to allocate from this node
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and succeeded.
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For easier reading you can use the numastat utility from the numactl package
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(ftp://ftp.suse.com/pub/people/ak/numa/numactl*). Note that it only works
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well right now on machines with a small number of CPUs.
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