一、dumpsys meminfo命令
dumpsys meminfo 是Android系统提供的查询内存命令,用该命令可以看到:
每个进程占用的物理内存大小
系统内存分布状态,包括
总的可用物理内存 Total RAM
当前可用物理内存 Free RAM
已用物理内存 Used RAM
不可见内存 Lost RAM
比如输入该命令后输出如下日志:
130|root@MR820:# dumpsys meminfo
Applications Memory Usage (kB):
Uptime: 698643 Realtime: 698643
Total PSS by process:
23437 kB: system (pid 1980)
21293 kB: com.android.systemui (pid 2139)
19164 kB: com.android.settings (pid 2660 / activities)
18460 kB: im.yixin.tv (pid 2300)
18358 kB: com.fiberhome.iptv (pid 2356 / activities)
17374 kB: com.example.wd.mylauncher (pid 3035 / activities)
14480 kB: com.android.smart.tv.cloud189 (pid 2618)
12488 kB: zygote (pid 1409)
8324 kB: com.egame.tv (pid 2769)
7637 kB: com.fiberhome.fhnotice (pid 3065 / activities)
7215 kB: com.yx.itvhelpself (pid 2883 / activities)
7083 kB: im.yixin.tv:core (pid 2494)
7068 kB: com.fh.tr069 (pid 2397)
6778 kB: com.fiberhome.factoryTest (pid 2371)
6418 kB: android.process.media (pid 2513)
6223 kB: com.android.smart.tv.cloud189:upnp (pid 2639)
6169 kB: android.process.acore (pid 2475)
5707 kB: com.fiberhome.fhupgrade (pid 2384)
5101 kB: com.hisilicon.android.hiRMService (pid 2336)
4804 kB: com.hisilicon.android.inputmethod.remote (pid 2276)
4576 kB: mediaserver (pid 1411)
4289 kB: com.android.gallery3d (pid 2977)
4288 kB: com.hisilicon.dlna.dmr (pid 2322)
4281 kB: com.android.bluetooth (pid 2714)
4252 kB: com.hisilicon.dlna.dms (pid 2314)
4076 kB: tel.gateway (pid 2602)
3899 kB: com.hisilicon.android.music (pid 2899)
2888 kB: com.android.keychain (pid 2992)
2880 kB: com.fh.iptablespatch (pid 2583)
2860 kB: com.android.defcontainer (pid 2927)
2855 kB: com.android.musicfx (pid 2954)
2748 kB: com.android.printspooler (pid 2462)
2724 kB: com.example.neterrorcodemanagement (pid 2850)
2506 kB: com.svox.pico (pid 3010)
2439 kB: com.FHSqmLoader (pid 2411)
2341 kB: com.hisilicon.uvmos.monitor (pid 2699)
1540 kB: surfaceflinger (pid 1408)
1242 kB: hisysmanager (pid 1419)
1169 kB: drmserver (pid 1410)
1080 kB: hiaoservice (pid 1417)
971 kB: sample_ipcfg (pid 1555)
681 kB: android_ir_user (pid 1425)
593 kB: netd (pid 1406)
588 kB: vold (pid 1405)
550 kB: displaysetting (pid 1421)
542 kB: frontPanel (pid 1416)
475 kB: httpd (pid 1583)
431 kB: keystore (pid 1413)
421 kB: hikaraokeservice (pid 1420)
370 kB: netshared (pid 1418)
345 kB: /init (pid 1)
304 kB: udhcpc (pid 3726)
301 kB: configserver (pid 1422)
297 kB: upgradeserver (pid 1415)
204 kB: sh (pid 1426)
203 kB: installd (pid 1412)
172 kB: sh (pid 3707)
172 kB: dumpsys (pid 3731)
167 kB: httpd (pid 1603)
164 kB: ueventd (pid 1061)
162 kB: httpd (pid 1604)
162 kB: httpd (pid 1606)
162 kB: httpd (pid 1609)
162 kB: httpd (pid 1610)
150 kB: debuggerd (pid 1407)
136 kB: healthd (pid 1403)
115 kB: servicemanager (pid 1404)
Total PSS by OOM adjustment:
31095 kB: Native
12488 kB: zygote (pid 1409)
4576 kB: mediaserver (pid 1411)
1540 kB: surfaceflinger (pid 1408)
1242 kB: hisysmanager (pid 1419)
1169 kB: drmserver (pid 1410)
1080 kB: hiaoservice (pid 1417)
971 kB: sample_ipcfg (pid 1555)
681 kB: android_ir_user (pid 1425)
593 kB: netd (pid 1406)
588 kB: vold (pid 1405)
550 kB: displaysetting (pid 1421)
542 kB: frontPanel (pid 1416)
475 kB: httpd (pid 1583)
431 kB: keystore (pid 1413)
421 kB: hikaraokeservice (pid 1420)
370 kB: netshared (pid 1418)
345 kB: /init (pid 1)
304 kB: udhcpc (pid 3726)
301 kB: configserver (pid 1422)
297 kB: upgradeserver (pid 1415)
204 kB: sh (pid 1426)
203 kB: installd (pid 1412)
172 kB: sh (pid 3707)
172 kB: dumpsys (pid 3731)
167 kB: httpd (pid 1603)
164 kB: ueventd (pid 1061)
162 kB: httpd (pid 1604)
162 kB: httpd (pid 1606)
162 kB: httpd (pid 1609)
162 kB: httpd (pid 1610)
150 kB: debuggerd (pid 1407)
136 kB: healthd (pid 1403)
115 kB: servicemanager (pid 1404)
23437 kB: System
23437 kB: system (pid 1980)
98548 kB: Persistent
21293 kB: com.android.systemui (pid 2139)
18460 kB: im.yixin.tv (pid 2300)
18358 kB: com.fiberhome.iptv (pid 2356 / activities)
7068 kB: com.fh.tr069 (pid 2397)
6778 kB: com.fiberhome.factoryTest (pid 2371)
5707 kB: com.fiberhome.fhupgrade (pid 2384)
5101 kB: com.hisilicon.android.hiRMService (pid 2336)
4804 kB: com.hisilicon.android.inputmethod.remote (pid 2276)
4288 kB: com.hisilicon.dlna.dmr (pid 2322)
4252 kB: com.hisilicon.dlna.dms (pid 2314)
2439 kB: com.FHSqmLoader (pid 2411)
7637 kB: Foreground
7637 kB: com.fiberhome.fhnotice (pid 3065 / activities)
18579 kB: Visible
7215 kB: com.yx.itvhelpself (pid 2883 / activities)
7083 kB: im.yixin.tv:core (pid 2494)
4281 kB: com.android.bluetooth (pid 2714)
4076 kB: A Services
4076 kB: tel.gateway (pid 2602)
2724 kB: B Services
2724 kB: com.example.neterrorcodemanagement (pid 2850)
105418 kB: Cached
19164 kB: com.android.settings (pid 2660 / activities)
17374 kB: com.example.wd.mylauncher (pid 3035 / activities)
14480 kB: com.android.smart.tv.cloud189 (pid 2618)
8324 kB: com.egame.tv (pid 2769)
6418 kB: android.process.media (pid 2513)
6223 kB: com.android.smart.tv.cloud189:upnp (pid 2639)
6169 kB: android.process.acore (pid 2475)
4289 kB: com.android.gallery3d (pid 2977)
3899 kB: com.hisilicon.android.music (pid 2899)
2888 kB: com.android.keychain (pid 2992)
2880 kB: com.fh.iptablespatch (pid 2583)
2860 kB: com.android.defcontainer (pid 2927)
2855 kB: com.android.musicfx (pid 2954)
2748 kB: com.android.printspooler (pid 2462)
2506 kB: com.svox.pico (pid 3010)
2341 kB: com.hisilicon.uvmos.monitor (pid 2699)
Total PSS by category:
118323 kB: Dalvik
45865 kB: .so mmap
40515 kB: Dalvik Other
34678 kB: Unknown
33415 kB: .dex mmap
6279 kB: .apk mmap
4224 kB: Stack
3530 kB: Other mmap
2039 kB: Native
1986 kB: .ttf mmap
340 kB: Other dev
164 kB: .jar mmap
152 kB: Ashmem
4 kB: Cursor
0 kB: code mmap
0 kB: image mmap
0 kB: Graphics
0 kB: GL
0 kB: Memtrack
Total RAM: 1015868 kB
Free RAM: 638914 kB (105418 cached pss + 180168 cached + 353328 free)
Used RAM: 211428 kB (186096 used pss + 8008 buffers + 520 shmem + 16804 slab)
Lost RAM: 165526 kB
Tuning: 96 (large 256), oom 20480 kB, restore limit 6826 kB (high-end-gfx)
该命令打印的最后一部分,反应系统级别的内存状况:
Total RAM: 1015868 kB
Free RAM: 638914 kB (105418 cached pss + 180168 cached + 353328 free)
Used RAM: 211428 kB (186096 used pss + 8008 buffers + 520 shmem + 16804 slab)
Lost RAM: 165526 kB
Tuning: 96 (large 256), oom 20480 kB, restore limit 6826 kB (high-end-gfx)
里面某些字段的意义需要注意:
dumpsys meminfo
- Lost = driver reserve + GPU + ION
- Totol = Physic mem – MMZ(40M+) - kernel reserve(30M+)
- 实际可用内存 = Free
二、LowMemoryKiller和OOM Killer机制
OOM Killer(Out Of Memory Killer) 是Linux当中,内存保护机制的一种。当物理内存几乎耗尽而又需要分配新内存时,会杀掉一些优先级低的进程,释放内存。
LowMemoryKiller 是Android的内存保护机制。当物理内存低于阈值,就会杀掉一些优先级低的进程,释放内存。
联系:LowMemoryKiller 用到了 OOM Killer 的评分机制
区别:LowMemoryKiller 是通过阈值触发,OOM Killer 是分配内存失败时触发
评分原理:
oom_adj,代表进程的优先级, 数值越大,优先级越低,越容易被杀。系统分16个级别(取值范围[-16, 15]整数,不连续)
通过 cat /proc/xxx/oom_adj 查看,其中xxx是进程号
oom_score_adj: 在 oom_adj 基础上的评分,取值范围[-1000, 1000]
通过 cat /proc/xxx/oom_score_adj 查看,其中xxx是进程号
阈值查看,以98mv100为例:
cat /sys/module/lowmemorykiller/parameters/minfree
1024,1536,2048,3072,3584,4096
cat /sys/module/lowmemorykiller/parameters/adj
0,58,117,176,529,1000
上诉数值表示:可用内存低于 40964K 时,杀掉 oom_score_adj>=1000 的应用;可用内存低于 35844K 时,杀掉 oom_score_adj>=529 的应用,以此类推。
因此,客户可以通过调整 minfree 的阈值来触发 LowMemoryKiller 更频繁地杀应用,从而为高优先级应用省下内存。
在 dumpsys meminfo 中,GPU内存被统计到了 Lost RAM 里面了。
因此,当应用占用GPU内存过高时,不会体现在 Used RAM 里面,而是体现在 Lost RAM 中。反过来,如果发现有问题的时候 Lost RAM 很高,就需要看看GPU内存使用情况了。用以下命令:�
mount -t debugfs debugfs /sys/kernel/debug/
cat /sys/kernel/debug/mali/gpu_memory
130|root@MR820:/ # cat /sys/kernel/debug/mali/gpu_memory
Name (:bytes) pid mali_mem max_mali_mem external_mem ump_mem dma_mem
==============================================================================================================
erhome.fhnotice 3065 3706880 3706880 0 0 1056768
.yx.itvhelpself 2883 6307840 6307840 0 0 13074432
ndroid.settings 2660 3670016 17088512 0 0 0
im.yixin.tv 2300 2875392 9961472 0 0 0
art.tv.cloud189 2618 3145728 8675328 0 0 0
e.wd.mylauncher 3035 2621440 14663680 0 0 0
ndroid.systemui 2139 524288 12054528 0 0 16384
.fiberhome.iptv 2356 1048576 6393856 0 0 0
surfaceflinger 1408 3948544 4210688 22118400 0 24367104
Mali mem usage: 27848704
Mali mem limit: 536870912
其中mali_mem列就是应用占用的GPU内存
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