1e41f4b71Sopenharmony_ci# oom 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci 4e41f4b71Sopenharmony_ci## 命令功能 5e41f4b71Sopenharmony_ci 6e41f4b71Sopenharmony_ci查看和设置低内存阈值以及pagecache内存回收阈值。 7e41f4b71Sopenharmony_ci 8e41f4b71Sopenharmony_ci 9e41f4b71Sopenharmony_ci## 命令格式 10e41f4b71Sopenharmony_ci 11e41f4b71Sopenharmony_cioom 12e41f4b71Sopenharmony_ci 13e41f4b71Sopenharmony_cioom -i [_interval_] 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_cioom -m [_mem byte_] 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_cioom -r [_mem byte_] 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_cioom -h | --help 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ci 22e41f4b71Sopenharmony_ci## 参数说明 23e41f4b71Sopenharmony_ci 24e41f4b71Sopenharmony_ci**表1** 参数说明 25e41f4b71Sopenharmony_ci 26e41f4b71Sopenharmony_ci| 参数 | 参数说明 | 取值范围 | 27e41f4b71Sopenharmony_ci| ----------------------- | ------------------------------- | ------------------------------------------------------------ | 28e41f4b71Sopenharmony_ci| -i [interval] | 设置oom线程任务检查的时间间隔。 | [100, 10000] 单位: ms | 29e41f4b71Sopenharmony_ci| -m [mem byte] | 设置低内存阈值。 | 0MB ~ 1MB，0MB表示不做低内存阈值检查。 | 30e41f4b71Sopenharmony_ci| -r [mem byte] | 设置pagecache内存回收阈值。 | 低内存阈值 ~ 系统可用最大内存，一个pagecache页一般为4KB，也有16 ~ 64KB的情况。 | 31e41f4b71Sopenharmony_ci| -h \| --help | 使用帮助。 | N/A | 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ci 34e41f4b71Sopenharmony_ci## 使用指南 35e41f4b71Sopenharmony_ci 36e41f4b71Sopenharmony_ci 参数缺省时，显示oom功能当前配置信息。 37e41f4b71Sopenharmony_ci 38e41f4b71Sopenharmony_ci>  **说明：** 39e41f4b71Sopenharmony_ci> 当系统内存不足时，会打印出内存不足的提示信息。 40e41f4b71Sopenharmony_ci 41e41f4b71Sopenharmony_ci 42e41f4b71Sopenharmony_ci## 使用实例 43e41f4b71Sopenharmony_ci 44e41f4b71Sopenharmony_ci举例： 45e41f4b71Sopenharmony_ci 46e41f4b71Sopenharmony_ci- oom 47e41f4b71Sopenharmony_ci 48e41f4b71Sopenharmony_ci- oom -i 100 49e41f4b71Sopenharmony_ci 50e41f4b71Sopenharmony_ci 51e41f4b71Sopenharmony_ci## 输出说明 52e41f4b71Sopenharmony_ci 53e41f4b71Sopenharmony_ci**示例1** oom缺省打印配置信息 54e41f4b71Sopenharmony_ci 55e41f4b71Sopenharmony_ci 56e41f4b71Sopenharmony_ci``` 57e41f4b71Sopenharmony_ciOHOS:/$ oom 58e41f4b71Sopenharmony_ci[oom] oom loop task status: enabled 59e41f4b71Sopenharmony_ci oom low memory threshold: 0x80000(byte) 60e41f4b71Sopenharmony_ci oom reclaim memory threshold: 0x500000(byte) 61e41f4b71Sopenharmony_ci oom check interval: 100(microsecond) 62e41f4b71Sopenharmony_ci``` 63e41f4b71Sopenharmony_ci 64e41f4b71Sopenharmony_ci系统内存不足时打印提示信息 65e41f4b71Sopenharmony_ci 66e41f4b71Sopenharmony_ci 67e41f4b71Sopenharmony_ci``` 68e41f4b71Sopenharmony_ciT:20 Enter:IT MEM 00M 001 69e41f4b71Sopenharmony_ci[oom] OS is in low memory state 70e41f4b71Sopenharmony_citotal physical memory: 0x1bcf000(byte), used: 0x1b50000(byte) ,free: 0x7f000(byte), low memory threshold: 0x80000(byte) 71e41f4b71Sopenharmony_ci[oom] candidate victim process init pid: 1, actual phy mem byte:82602 72e41f4b71Sopenharmony_ci[oom] candidate victim process shell pid: 3, actual phy mem byte:14950e 73e41f4b71Sopenharmony_ci[oom] candidate victim process testsuits app pid: 4, actual phy mem byte:1334598 74e41f4b71Sopenharmony_ci[oom] candidate victim process UserProcess12 pid: 12, actual phy mem byte:25951558 75e41f4b71Sopenharmony_ci[oom] max phy mem used process UserProcess12 pid: 12, actual phy mem 25951558 76e41f4b71Sopenharmony_ci################excFrom: User!#################### 77e41f4b71Sopenharmony_cidata abort fsr:0x817, far:0x225af000 78e41f4b71Sopenharmony_ciAbort caused by a write instruction. Translation fault, page 79e41f4b71Sopenharmony_ciexcType: data abort 80e41f4b71Sopenharmony_ciprocessName = UserProcess12 81e41f4b71Sopenharmony_ciprocessID = 12 82e41f4b71Sopenharmony_ciprocess aspace = 0х01000000 -> 0х3f000000 83e41f4b71Sopenharmony_citaskName = threado 84e41f4b71Sopenharmony_citaskID = 22 85e41f4b71Sopenharmony_citask user stack = 0х20e17000 -> 0х20e21000 86e41f4b71Sopenharmony_cipc = 0x93969dc in /usr/bin/testsuits app ---> 0x19f9dc 87e41f4b71Sopenharmony_ciulr = 0x93969cc in /usr/bin/testsuits app ---> 0x19f9cc 88e41f4b71Sopenharmony_ciusp = 0х20e20c68fp = 0x20e20c8c 89e41f4b71Sopenharmony_ciR0 = 0х20e35000 90e41f4b71Sopenharmony_ciR1 = 0x225af000 91e41f4b71Sopenharmony_ciR2 = 0x0 92e41f4b71Sopenharmony_ciR3 = 0х28e35000 93e41f4b71Sopenharmony_ciR4 = 0х0 94e41f4b71Sopenharmony_ciR5 = 0х9500000 95e41f4b71Sopenharmony_ciR6 = 0х14 96e41f4b71Sopenharmony_ciR7 = 0х97822c4 97e41f4b71Sopenharmony_ciR8 = 0x970cfa8 98e41f4b71Sopenharmony_ciR9 = 0x9090909 99e41f4b71Sopenharmony_ciR10 = 0xa0a0a0a 100e41f4b71Sopenharmony_ciR11 = 0x20e20c8c 101e41f4b71Sopenharmony_ciR12 = 0х0 102e41f4b71Sopenharmony_ciCPSR = 0х80000010 103e41f4b71Sopenharmony_ci***backtrace beain*** 104e41f4b71Sopenharmony_citraceback 0 -- lr = 0x9242e1c fp = 0х20e20cc4 lr in /usr/bin/testsuits apr 0x4be1c 105e41f4b71Sopenharmony_citraceback 1 -- 1r = 0х92430cc fp = 0x20e20cdc lr in /usr/bin/testsuits app --> 0x4c0cc 106e41f4b71Sopenharmony_citraceback 2 -- 1r = 0x9396ab0 fp = 0x20e20cec lr in /usr/bin/testsuits app -> 0х19fab0 107e41f4b71Sopenharmony_citraceback 3 -- lr = 0x9393eb4 fp = 0x20e20cf4 lr in /usr/bin/testsuits ap --> 0x19ceb4 108e41f4b71Sopenharmony_citraceback 4 -- lr = 0x92427d4 fp = 0x20e20d44 lr in /usr/bin/testsuits app --> 0x4b7d4 109e41f4b71Sopenharmony_citraceback 5 -- 1r = 0x20c4df50 fp = 0хb0b0b0b 1r in /1ib/libc.so - -> 0x62f50 110e41f4b71Sopenharmony_ci``` 111e41f4b71Sopenharmony_ci 112e41f4b71Sopenharmony_ci 113e41f4b71Sopenharmony_ci**示例2** 设置 oom 线程任务检查的时间间隔 114e41f4b71Sopenharmony_ci 115e41f4b71Sopenharmony_ci 116e41f4b71Sopenharmony_ci 117e41f4b71Sopenharmony_ci``` 118e41f4b71Sopenharmony_ciOHOS:/$ oom -i 100 119e41f4b71Sopenharmony_ci[oom] set oom check interval (100)ms successful 120e41f4b71Sopenharmony_ci``` 121e41f4b71Sopenharmony_ci 122e41f4b71Sopenharmony_ci 123e41f4b71Sopenharmony_ci**表2** 输出说明 124e41f4b71Sopenharmony_ci 125e41f4b71Sopenharmony_ci| 输出 | 说明 | 126e41f4b71Sopenharmony_ci| ------------------------------------------------------------ | ------------------------------------------------------------ | 127e41f4b71Sopenharmony_ci| [oom] OS is in low memory state<br/>total physical memory: 0x1bcf000(byte), used: 0x1b50000(byte), free: 0x7f000(byte), low memory threshold: 0x80000(byte) | 操作系统处于低内存状态。<br/>整个系统可用物理内存为0x1bcf000 byte，已经使用了 0x1b50000 byte， 还剩0x7f000 byte，当前设置的低内存阈值为0x80000 byte。 | 128e41f4b71Sopenharmony_ci| [oom] candidate victim process init pid: 1, actual phy mem byte: 82602 | 打印当前各个进程的内存使用情况，init进程实际占用物理内存82602byte。 | 129e41f4b71Sopenharmony_ci| [oom] candidate victim process UserProcess12 pid: 12, actual phy mem byte: 25951558 | UserProcess12进程实际使用25951558byte内存。 | 130e41f4b71Sopenharmony_ci| [oom] max phy mem used process UserProcess12 pid: 12, actual phy mem: 25951558 | 当前使用内存最多的进程是UserProcess12。 | 131e41f4b71Sopenharmony_ci| excFrom: User! | 当系统处于低内存的情况下，UserProcess12进程再去申请内存时失败退出。 |
