Function calculateMemUsageUnixNoCache

cli/command/container/stats_helpers.go:254–264

calculateMemUsageUnixNoCache calculate memory usage of the container. Cache is intentionally excluded to avoid misinterpretation of the output. On cgroup v1 host, the result is `mem.Usage - mem.Stats["total_inactive_file"]` . On cgroup v2 host, the result is `mem.Usage - mem.Stats["inactive_file"]

(mem container.MemoryStats)

// On Docker 19.03 and older, the result was `mem.Usage - mem.Stats["cache"]`.
// See https://github.com/moby/moby/issues/40727 for the background.
func calculateMemUsageUnixNoCache(mem container.MemoryStats) float64 {
	// cgroup v1
	if v, isCgroup1 := mem.Stats["total_inactive_file"]; isCgroup1 && v < mem.Usage {
		return float64(mem.Usage - v)
	}
	// cgroup v2
	if v := mem.Stats["inactive_file"]; v < mem.Usage {
		return float64(mem.Usage - v)
	}
	return float64(mem.Usage)
}

func calculateMemPercentUnixNoCache(limit float64, usedNoCache float64) float64 {
	// MemoryStats.Limit will never be 0 unless the container is not running and we haven't