K8S/Docker中对于容器内存的监控 (www.ipcpu.com)

   # 容器当前已使用的内存Bytes
/cgroup/memory/docker/$DOCKERID/memory.usage_in_bytes
# 容器最大限制内存Bytes
/cgroup/memory/docker/$DOCKERID/memory.limit_in_bytes

   mem.Usage - mem.Stats["cache"]

   // calculateMemUsageUnixNoCache calculate memory usage of the container.
// Page cache is intentionally excluded to avoid misinterpretation of the output.
func calculateMemUsageUnixNoCache(mem types.MemoryStats) float64 {
    return float64(mem.Usage - mem.Stats["cache"])
}

   mem.Usage - inactive_file

   // 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"] `.
//
// This definition is consistent with cadvisor and containerd/CRI.
// * https://github.com/google/cadvisor/commit/307d1b1cb320fef66fab02db749f07a459245451
// * https://github.com/containerd/cri/commit/6b8846cdf8b8c98c1d965313d66bc8489166059a
//
// 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 types.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)
}

   workingSet := ret.Memory.Usage
    if v, ok := s.MemoryStats.Stats["total_inactive_file"]; ok {
        if workingSet < v {
            workingSet = 0
        } else {
            workingSet -= v
        }
    }
    ret.Memory.WorkingSet = workingSet

   Memory.Usage - MemoryStats.Stats["total_inactive_file"]

   memory_working_set  = Memory.Usage - Memeory.inactive_file