記憶體統計說明

dmesg | grep Memory
Memory: 131604168K/134217136K available (14346K kernel code, 9546K rwdata, 9084K rodata, 2660K init, 7556K bss, 2612708K reserved, 0K cma-reserved)

total = used + free + buff/cache    //總記憶體=已使用記憶體+空閑記憶體+緩衝

cgroup.event_control       #用於eventfd的介面
memory.usage_in_bytes      #顯示當前已用的記憶體
memory.limit_in_bytes      #設定/顯示當前限制的記憶體額度
memory.failcnt             #顯示記憶體使用量量達到限制值的次數
memory.max_usage_in_bytes  #歷史記憶體最大使用量
memory.soft_limit_in_bytes #設定/顯示當前限制的記憶體軟額度
memory.stat                #顯示當前cgroup的記憶體使用量情況
memory.use_hierarchy       #設定/顯示是否將子cgroup的記憶體使用量情況統計到當前cgroup裡面
memory.force_empty         #觸發系統立即儘可能的回收當前cgroup中可以回收的記憶體
memory.pressure_level      #設定記憶體壓力的通知事件，配合cgroup.event_control一起使用
memory.swappiness          #設定和顯示當前的swappiness
memory.move_charge_at_immigrate #設定當進程移動到其他cgroup中時，它所佔用的記憶體是否也隨著移動過去
memory.oom_control         #設定/顯示oom controls相關的配置
memory.numa_stat           #顯示numa相關的記憶體

func decodeMemory(target *resource.Quantity, memStats *stats.MemoryStats) error {
    if memStats == nil || memStats.WorkingSetBytes == nil {
        return fmt.Errorf("missing memory usage metric")
    }

    *target = *uint64Quantity(*memStats.WorkingSetBytes, 0)
    target.Format = resource.BinarySI

    return nil
}

func setMemoryStats(s *cgroups.Stats, ret *info.ContainerStats) {
    ret.Memory.Usage = s.MemoryStats.Usage.Usage
    ret.Memory.MaxUsage = s.MemoryStats.Usage.MaxUsage
    ret.Memory.Failcnt = s.MemoryStats.Usage.Failcnt

    if s.MemoryStats.UseHierarchy {
        ret.Memory.Cache = s.MemoryStats.Stats["total_cache"]
        ret.Memory.RSS = s.MemoryStats.Stats["total_rss"]
        ret.Memory.Swap = s.MemoryStats.Stats["total_swap"]
        ret.Memory.MappedFile = s.MemoryStats.Stats["total_mapped_file"]
    } else {
        ret.Memory.Cache = s.MemoryStats.Stats["cache"]
        ret.Memory.RSS = s.MemoryStats.Stats["rss"]
        ret.Memory.Swap = s.MemoryStats.Stats["swap"]
        ret.Memory.MappedFile = s.MemoryStats.Stats["mapped_file"]
    }
    if v, ok := s.MemoryStats.Stats["pgfault"]; ok {
        ret.Memory.ContainerData.Pgfault = v
        ret.Memory.HierarchicalData.Pgfault = v
    }
    if v, ok := s.MemoryStats.Stats["pgmajfault"]; ok {
        ret.Memory.ContainerData.Pgmajfault = v
        ret.Memory.HierarchicalData.Pgmajfault = v
    }

    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
}

jcmd 7 VM.native_memory

Native Memory Tracking:

Total: reserved=5948141KB, committed=4674781KB
-                 Java Heap (reserved=4194304KB, committed=4194304KB)
                            (mmap: reserved=4194304KB, committed=4194304KB)

-                     Class (reserved=1139893KB, committed=104885KB)
                            (classes #21183)
                            (  instance classes #20113, array classes #1070)
                            (malloc=5301KB #81169)
                            (mmap: reserved=1134592KB, committed=99584KB)
                            (  Metadata:   )
                            (    reserved=86016KB, committed=84992KB)
                            (    used=80663KB)
                            (    free=4329KB)
                            (    waste=0KB =0.00%)
                            (  Class space:)
                            (    reserved=1048576KB, committed=14592KB)
                            (    used=12806KB)
                            (    free=1786KB)
                            (    waste=0KB =0.00%)

-                    Thread (reserved=228211KB, committed=36879KB)
                            (thread #221)
                            (stack: reserved=227148KB, committed=35816KB)
                            (malloc=803KB #1327)
                            (arena=260KB #443)

-                      Code (reserved=49597KB, committed=2577KB)
                            (malloc=61KB #800)
                            (mmap: reserved=49536KB, committed=2516KB)

-                        GC (reserved=206786KB, committed=206786KB)
                            (malloc=18094KB #16888)
                            (mmap: reserved=188692KB, committed=188692KB)

-                  Compiler (reserved=1KB, committed=1KB)
                            (malloc=1KB #20)

-                  Internal (reserved=45418KB, committed=45418KB)
                            (malloc=45386KB #30497)
                            (mmap: reserved=32KB, committed=32KB)

-                     Other (reserved=30498KB, committed=30498KB)
                            (malloc=30498KB #234)

-                    Symbol (reserved=19265KB, committed=19265KB)
                            (malloc=16796KB #212667)
                            (arena=2469KB #1)

-    Native Memory Tracking (reserved=5602KB, committed=5602KB)
                            (malloc=55KB #747)
                            (tracking overhead=5546KB)

-        Shared class space (reserved=10836KB, committed=10836KB)
                            (mmap: reserved=10836KB, committed=10836KB)

-               Arena Chunk (reserved=169KB, committed=169KB)
                            (malloc=169KB)

-                   Tracing (reserved=16642KB, committed=16642KB)
                            (malloc=16642KB #2270)

-                   Logging (reserved=7KB, committed=7KB)
                            (malloc=7KB #267)

-                 Arguments (reserved=19KB, committed=19KB)
                            (malloc=19KB #514)

-                    Module (reserved=463KB, committed=463KB)
                            (malloc=463KB #3527)

-              Synchronizer (reserved=423KB, committed=423KB)
                            (malloc=423KB #3525)

-                 Safepoint (reserved=8KB, committed=8KB)
                            (mmap: reserved=8KB, committed=8KB)