AndroidStudio-Profile工具导致的一个奇怪问题

在使用AndroidStudio里面的Profile查看内存占用时,发现一个奇怪的现象:

cpu profile

应用启动后Native内存猛增,即使一个空的App也是如此,按理说不应该。于是用adb工具导出了一次内存:

adb shell dumpsys meminfo top.vimerzhao.pureandroid                                                                                                                               [14:30:29]
Applications Memory Usage (in Kilobytes):
Uptime: 2823489068 Realtime: 5348646182

** MEMINFO in pid 17960 [top.vimerzhao.pureandroid] **
                   Pss  Private  Private  SwapPss     Heap     Heap     Heap
                 Total    Dirty    Clean    Dirty     Size    Alloc     Free
                ------   ------   ------   ------   ------   ------   ------
  Native Heap     5347     5320        0      149    22528    18049     4478
  Dalvik Heap        0        0        0        0     3231     1616     1615
        Stack       76       76        0        0
       Ashmem       13        0       12        0
      Gfx dev      248      248        0        0
    Other dev        2        0        0        0
     .so mmap     1328      188      332       14
    .apk mmap      193        0       56        0
    .ttf mmap       88        0       20        0
    .dex mmap     3450       16     2496        0
    .oat mmap       68        0        4        0
    .art mmap     7587     6736      480       84
   Other mmap        8        4        0        0
   EGL mtrack    16440    16440        0        0
    GL mtrack     3340     3340        0        0
      Unknown     5000     4088      852       27
        TOTAL    43462    36456     4252      274    25759    19665     6093

 App Summary
                       Pss(KB)
                        ------
           Java Heap:     7216
         Native Heap:     5320
                Code:     3112
               Stack:       76
            Graphics:    20028
       Private Other:     4956
              System:     2754

               TOTAL:    43462       TOTAL SWAP PSS:      274

 Objects
               Views:       16         ViewRootImpl:        1
         AppContexts:        5           Activities:        1
              Assets:        5        AssetManagers:        0
       Local Binders:       12        Proxy Binders:       30
       Parcel memory:        3         Parcel count:       13
    Death Recipients:        2      OpenSSL Sockets:        0
            WebViews:        0

 SQL
         MEMORY_USED:        0
  PAGECACHE_OVERFLOW:        0          MALLOC_SIZE:        0

再在启用Profile观察的同时导出一次内存:

adb shell dumpsys meminfo top.vimerzhao.pureandroid                                                                                                                               [14:31:01]
Applications Memory Usage (in Kilobytes):
Uptime: 2823564651 Realtime: 5348721765

** MEMINFO in pid 18399 [top.vimerzhao.pureandroid] **
                   Pss  Private  Private  SwapPss     Heap     Heap     Heap
                 Total    Dirty    Clean    Dirty     Size    Alloc     Free
                ------   ------   ------   ------   ------   ------   ------
  Native Heap    47866    47844        0      149    63488    54816     8673
  Dalvik Heap        0        0        0        0     3281     1641     1640
        Stack       76       76        0        0
       Ashmem       13        0       12        0
      Gfx dev      252      252        0        0
    Other dev        2        0        0        0
     .so mmap     4202     2380      868       14
    .apk mmap      221        0       80        0
    .ttf mmap       88        0       20        0
    .dex mmap     6691       16     5192        0
    .oat mmap      131        0       16        0
    .art mmap     7698     6864      472       85
   Other mmap        8        4        0        0
   EGL mtrack    16440    16440        0        0
    GL mtrack     3336     3336        0        0
      Unknown     6519     5608      852       27
        TOTAL    93818    82820     7512      275    66769    56457    10313

 App Summary
                       Pss(KB)
                        ------
           Java Heap:     7336
         Native Heap:    47844
                Code:     8572
               Stack:       76
            Graphics:    20028
       Private Other:     6476
              System:     3486

               TOTAL:    93818       TOTAL SWAP PSS:      275

 Objects
               Views:       16         ViewRootImpl:        1
         AppContexts:        5           Activities:        1
              Assets:        6        AssetManagers:        0
       Local Binders:       12        Proxy Binders:       30
       Parcel memory:        3         Parcel count:       12
    Death Recipients:        2      OpenSSL Sockets:        0
            WebViews:        0

 SQL
         MEMORY_USED:        0
  PAGECACHE_OVERFLOW:        0          MALLOC_SIZE:        0

看起来是因为Profile这个工具导致的,应该是出于监控需要,但是底层原理暂时也不清楚,故只能做如此猜测了,可惜。