如果有其它資訊來源，儘量不必要使用crash 工具。原理和之前分析的一致，只是
meminfo 來源不一樣。
1. 首先使用kmem -z 檢視系統記憶體的整體情況
發現ANON 佔用記憶體較多為系統中有528MB + 195MB = 733MB 的匿名頁 這對於
1GB 的記憶體的機器來說這本身是不正常的。
NODE: 0 ZONE: 0 ADDR: c0a8c0c0 NAME: "Normal"
SIZE: 194560 MIN/LOW/HIGH: 808/1651/1853
VM_STAT:
NR_FREE_PAGES: 2784
NR_INACTIVE_ANON: 69011
NR_ACTIVE_ANON: 68891
NR_INACTIVE_FILE: 833
NR_ACTIVE_FILE: 800
NR_UNEVICTABLE: 0
NR_MLOCK: 0
NR_ANON_PAGES: 137896 ===>538MB
NR_FILE_MAPPED: 853
NR_FILE_PAGES: 1653
NR_FILE_DIRTY: 2
NR_WRITEBACK: 838
NR_SLAB_RECLAIMABLE: 3399
NR_SLAB_UNRECLAIMABLE: 5314
NR_PAGETABLE: 1784
NR_KERNEL_STACK: 537
NR_UNSTABLE_NFS: 0
NR_BOUNCE: 0
NR_VMSCAN_WRITE: 154187
NR_VMSCAN_IMMEDIATE: 252
NR_WRITEBACK_TEMP: 0
NR_ISOLATED_ANON: 0
NR_ISOLATED_FILE: 0
NR_SHMEM: 1
NR_DIRTIED: 206981
NR_WRITTEN: 359510
NR_ANON_TRANSPARENT_HUGEPAGES: 0
NR_FREE_CMA_PAGES: 0
NODE: 0 ZONE: 1 ADDR: c0a8c3c0 NAME: "HighMem"
SIZE: 67584 MIN/LOW/HIGH: 66/414/498
VM_STAT:
NR_FREE_PAGES: 45
NR_INACTIVE_ANON: 25039
NR_ACTIVE_ANON: 24968
NR_INACTIVE_FILE: 555
NR_ACTIVE_FILE: 529
NR_UNEVICTABLE: 1216
NR_MLOCK: 0
NR_ANON_PAGES: 49999 ===>195MB
NR_FILE_MAPPED: 773
NR_FILE_PAGES: 2322
NR_FILE_DIRTY: 2
NR_WRITEBACK: 550
NR_SLAB_RECLAIMABLE: 0
NR_SLAB_UNRECLAIMABLE: 0
NR_PAGETABLE: 0
NR_KERNEL_STACK: 0
NR_UNSTABLE_NFS: 0
NR_BOUNCE: 0
NR_VMSCAN_WRITE: 877370
NR_VMSCAN_IMMEDIATE: 42
NR_WRITEBACK_TEMP: 0
NR_ISOLATED_ANON: 0
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NR_ISOLATED_FILE: 0
NR_SHMEM: 8
2. 使用Kmem –i ，或者long total_swap_page+ atomic_long_t nr_swap_pages 直接檢視
swap 變數的方式，檢視swap 分割槽情況：
crash> kmem -i
PAGES TOTAL PERCENTAGE
TOTAL MEM 231544 904.5 MB ----
FREE 2829 11.1 MB 1% of TOTAL MEM
USED 228715 893.4 MB 98% of TOTAL MEM
SHARED 3345 13.1 MB 1% of TOTAL MEM
BUFFERS 26 104 KB 0% of TOTAL MEM
CACHED 3949 15.4 MB 1% of TOTAL MEM
SLAB 8713 34 MB 3% of TOTAL MEM
TOTAL HIGH 67584 264 MB 29% of TOTAL MEM
FREE HIGH 45 180 KB 0% of TOTAL HIGH
TOTAL LOW 163960 640.5 MB 70% of TOTAL MEM
FREE LOW 2784 10.9 MB 1% of TOTAL LOW
TOTAL SWAP 153599 600 MB ----
SWAP USED 153599 600 MB 100% of TOTAL SWAP
SWAP FREE 0 0 0% of TOTAL SWAP
或者
crash> long total_swap_pages
total_swap_pages = $1 = 153599 單位為page，轉換為KB 要*4。
crash> atomic_long_t nr_swap_pages
struct atomic_long_t {
counter = 0 單位為page，轉換為KB 要*4，發現此時swap 空間為0.
}
3. Anon 佔用記憶體太多，且swap 分割槽使用完，典型的Framework+APP 記憶體洩漏，執行
Ps 命令找出具體洩漏者， Logd 和system_server 兩個程序佔用大量記憶體：
155 1 0 edfe4d80 IN 18.4 261968 193016 logd
252 1 0 ed75b180 IN 18.4 261968 193016 logd.reader
253 1 2 ed75b600 IN 18.4 261968 193016 logd.writer
255 1 1 ed75ba80 IN 18.4 261968 193016 logd
272 1 2 ed765b00 IN 18.4 261968 193016 logd.auditd
388 1 2 ed305b00 IN 18.4 261968 193016 logd.reader.per
4731 1 1 d02bfa80 IN 18.4 261968 193016 logd.reader.per
657 179 3 eccf9b00 IN 47.3 1722300 495904 system_server
660 179 1 ecd42880 IN 47.3 1722300 495904 Heap thread poo
661 179 0 ecd42d00 IN 47.3 1722300 495904 Heap thread poo
663 179 3 ecd43180 IN 47.3 1722300 495904 Heap thread poo
665 179 3 ed354900 IN 47.3 1722300 495904 Signal Catcher
667 179 2 ed357a80 IN 47.3 1722300 495904 JDWP
668 179 3 ed357600 IN 47.3 1722300 495904 ReferenceQueueD
669 179 0 ed356d00 IN 47.3 1722300 495904 FinalizerDaemon
670 179 3 ed356400 IN 47.3 1722300 495904 FinalizerWatchd
671 179 3 ed357180 IN 47.3 1722300 495904 HeapTrimmerDaem
672 179 1 ed356880 IN 47.3 1722300 495904 GCDaemon
689 179 2 ed2dc000 IN 47.3 1722300 495904 Binder_1
690 179 3 eccfa880 IN 47.3 1722300 495904 Binder_2
691 179 2 ed2de400 IN 47.3 1722300 495904 SensorEventAckR
692 179 3 ed2ded00 IN 47.3 1722300 495904 SensorService
693 179 3 eccfad00 IN 47.3 1722300 495904 android.bg
694 179 3 eccfb600 IN 47.3 1722300 495904 ActivityManager
695 179 1 eccfb180 IN 47.3 1722300 495904 FileObserver
696 179 2 ed307a80 IN 47.3 1722300 495904 android.fg
697 179 0 ed306d00 IN 47.3 1722300 495904 android.ui
698 179 0 ed2c9f80 IN 47.3 1722300 495904 android.io
699 179 3 ed2c8000 IN 47.3 1722300 495904 android.display
700 179 0 ed2cad00 IN 47.3 1722300 495904 CpuTracker
701 179 0 ed2cb180 IN 47.3 1722300 495904 PowerManagerSer
702 179 2 ed2c9200 IN 47.3 1722300 495904 system_server
703 179 2 ed2ca880 IN 47.3 1722300 495904 BatteryStats_wa
704 179 0 ed2cba80 IN 47.3 1722300 495904 PackageManager
907 179 2 ecd40900 IN 47.3 1722300 495904 PackageInstalle
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918 179 1 ecd42400 IN 47.3 1722300 495904 AlarmManager
925 179 1 ecd43a80 IN 47.3 1722300 495904 InputDispatcher
> 926 179 2 ecd41680 RU 47.3 1722300 495904 InputReader
927 179 2 eceaa880 IN 47.3 1722300 495904 MountService
928 179 2 eceaad00 IN 47.3 1722300 495904 VoldConnector
1315 179 3 ecd41b00 IN 47.3 1722300 495904 NetdConnector
1316 179 0 ece5e880 IN 47.3 1722300 495904 NetworkStats
1317 179 2 ece5d680 IN 47.3 1722300 495904 NetworkPolicy
1318 179 2 ece5ed00 IN 47.3 1722300 495904 WifiP2pService
1319 179 0 ece5f180 IN 47.3 1722300 495904 WifiStateMachin
1320 179 2 ece5c000 IN 47.3 1722300 495904 WifiService
1321 179 2 ecd41200 IN 47.3 1722300 495904 ConnectivitySer
1323 179 0 ecd40480 IN 47.3 1722300 495904 NsdService
1324 179 3 ecd43600 IN 47.3 1722300 495904 mDnsConnector
1325 179 2 ecd40d80 IN 47.3 1722300 495904 ranker
1326 179 2 ecd40000 IN 47.3 1722300 495904 AudioService
1327 179 3 ecd41f80 IN 47.3 1722300 495904 Binder_3
1328 179 0 eceab180 IN 47.3 1722300 495904 UEventObserver
1338 179 0 ece5cd80 IN 47.3 1722300 495904 WifiManager
1339 179 3 ece5f600 IN 47.3 1722300 495904 WcnManagerServi
1340 179 3 ece5d200 IN 47.3 1722300 495904 WcndConnector
1341 179 2 ecea9200 IN 47.3 1722300 495904 WifiWatchdogSta
1342 179 2 ecea8d80 IN 47.3 1722300 495904 WifiScanningSer
1343 179 3 ecea8900 IN 47.3 1722300 495904 WifiRttService
1344 179 2 ecea8000 IN 47.3 1722300 495904 backup
4. 檢視Logd 和system_server 兩個程序的具體記憶體使用情況：
通過其task_struct 來找到其對應的mm_struct
在mm_struct 中的rss_stat 記錄了這個程序所擁有的檔案頁的數量 匿名頁的數量 以及被swap 出去的匿名頁的數量
logd：
rss_stat = {
count = {{
counter = 65
}, {
counter = 48121 =====擁有的匿名頁187.9MB
}, {
counter = 12538 =====swap 出去的匿名頁48.9MB
}}
},
可以看到logd 擁有187.9 + 48.9 = 236.8 MB 的匿名頁 這個有點多
system_server:
rss_stat = {
count = {{
counter = 1054
}, {
counter = 121755 ==========擁有匿名頁475MB
}, {
counter = 116956 =======swap 出去的匿名頁456MB
}}
},
system_server 擁有475 + 456 = 931MB 的匿名頁 同時其虛擬地址空間已使用1722300 = 1.6GB 的大小

5. 確認logd 和 system_server 存在記憶體洩露的風險尤其是system_server

修改後的procrank命令可檢視程序rss和swap的使用情況，可排查哪個程序導致。ps命令看不了swap資訊。