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android重要进程的主要功能

2016-08-10 18:29 946 查看

使用adb命令 adb shell ps -p 或者 adb shell ps -p -t -P 可以发现很多进程信息, 那么问题来了. 这些进程的主要功能是什么?

命令执行结果如下:

USER PID PPID VSIZE RSS PRIO NICE RTPRI SCHED WCHAN PC NAME

root 1 0 2488 856 20 0 0 0 sys_epoll_ 000710f4 S /init

root 2 0 0 0 -2 0 1 1 kthreadd 00000000 S kthreadd

root 3 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/0

root 5 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/0:0H

root 6 2 0 0 20 0 0 0 msm_mpm_wo 00000000 D kworker/u:0

root 7 2 0 0 0 -20 0 0 msm_rpm_sm 00000000 D kworker/u:0H

root 8 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/0

root 21 2 0 0 0 -20 0 0 rescuer_th 00000000 S khelper

root 22 2 0 0 0 -20 0 0 rescuer_th 00000000 S netns

root 23 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:1

root 27 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/0:1H

root 28 2 0 0 0 -20 0 0 rescuer_th 00000000 S modem_notifier

root 29 2 0 0 0 -20 0 0 rescuer_th 00000000 S smd_channel_clo

root 30 2 0 0 0 -20 0 0 rescuer_th 00000000 S smsm_cb_wq

root 32 2 0 0 0 -20 0 0 rescuer_th 00000000 S rpm-smd

root 33 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/u:1H

root 34 2 0 0 0 -20 0 0 rescuer_th 00000000 S mpm

root 51 2 0 0 20 0 0 0 bdi_sync_s 00000000 S sync_supers

root 52 2 0 0 20 0 0 0 bdi_forker 00000000 S bdi-default

root 53 2 0 0 0 -20 0 0 rescuer_th 00000000 S kblockd

root 54 2 0 0 20 0 0 5 ion_heap_d 00000000 S system

root 55 2 0 0 20 0 0 0 hub_thread 00000000 S khubd

root 56 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/99-msm_iomm

root 57 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/105-msm_iom

root 58 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/77-msm_iomm

root 59 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/70-msm_iomm

root 60 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/94-msm_iomm

root 61 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/102-msm_iom

root 62 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/102-msm_iom

root 63 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/102-msm_iom

root 64 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/79-msm_iomm

root 65 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/78-msm_iomm

root 66 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/78-msm_iomm

root 67 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/74-msm_iomm

root 68 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 69 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 70 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 71 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 72 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/273-msm_iom

root 73 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/273-msm_iom

root 74 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/273-msm_iom

root 75 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/97-msm_iomm

root 76 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/97-msm_iomm

root 77 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/97-msm_iomm

root 78 2 0 0 0 -20 0 0 rescuer_th 00000000 S devfreq_wq

root 79 2 0 0 0 -20 0 0 rescuer_th 00000000 S l2cap

root 80 2 0 0 0 -20 0 0 rescuer_th 00000000 S a2mp

root 81 2 0 0 0 -20 0 0 rescuer_th 00000000 S cfg80211

root 93 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/475-adsp

root 94 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/411-mba

root 95 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/539-wcnss

root 96 2 0 0 0 -20 0 0 rescuer_th 00000000 S qmi

root 97 2 0 0 0 -20 0 0 rescuer_th 00000000 S nmea

root 98 2 0 0 0 -20 0 0 rescuer_th 00000000 S msm_ipc_router

root 99 2 0 0 0 -20 0 0 rescuer_th 00000000 S apr_driver

root 103 2 0 0 20 0 0 0 kswapd 00000000 S kswapd0

root 104 2 0 0 20 0 0 0 fsnotify_m 00000000 S fsnotify_mark

root 105 2 0 0 20 0 0 0 ecryptfs_t 00000000 S ecryptfs-kthrea

root 106 2 0 0 0 -20 0 0 rescuer_th 00000000 S cifsiod

root 107 2 0 0 0 -20 0 0 rescuer_th 00000000 S crypto

root 127 2 0 0 0 -20 0 0 rescuer_th 00000000 S ad_calc_wq

root 128 2 0 0 -17 0 16 1 dsi_event_ 00000000 D mdss_dsi_event

root 129 2 0 0 0 -20 0 0 rescuer_th 00000000 S k_hsuart

root 130 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_real_time_

root 131 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_modem_data

root 132 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_lpass_data

root 133 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_wcnss_data

root 134 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_wq

root 135 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_usb_wq

root 136 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_cntl_wq

root 137 2 0 0 0 -20 0 0 rescuer_th 00000000 S diag_dci_wq

root 138 2 0 0 0 -20 0 0 rescuer_th 00000000 S kgsl-3d0

root 139 2 0 0 0 -20 0 0 rescuer_th 00000000 S kgsl-events

root 140 2 0 0 0 -20 0 0 rescuer_th 00000000 S kgsl_devfreq_wq

root 147 2 0 0 0 -20 0 0 rescuer_th 00000000 S usbnet

root 148 2 0 0 0 -20 0 0 rescuer_th 00000000 S k_rmnet_mux_wor

root 149 2 0 0 0 -20 0 0 rescuer_th 00000000 S f_mdb_data

root 150 2 0 0 0 -20 0 0 rescuer_th 00000000 S f_mtp

root 151 2 0 0 20 0 0 0 sleep_thre 00000000 S file-storage

root 152 2 0 0 0 -20 0 0 rescuer_th 00000000 S uether

root 153 2 0 0 0 -20 0 0 rescuer_th 00000000 S kpsmoused

root 155 2 0 0 0 -20 0 0 rescuer_th 00000000 S msm_vidc_worker

root 156 2 0 0 0 -20 0 0 rescuer_th 00000000 S pm_workerq_venu

root 157 2 0 0 0 -20 0 0 rescuer_th 00000000 S msm_vidc_worker

root 158 2 0 0 0 -20 0 0 rescuer_th 00000000 S msm_cpp_workque

root 159 2 0 0 20 0 0 0 dbs_sync_t 00000000 D dbs_sync/0

root 160 2 0 0 20 0 0 0 dbs_sync_t 00000000 D dbs_sync/1

root 161 2 0 0 20 0 0 0 dbs_sync_t 00000000 D dbs_sync/2

root 162 2 0 0 20 0 0 0 dbs_sync_t 00000000 D dbs_sync/3

root 163 2 0 0 -100 0 99 1 cpufreq_in 00000000 S cfinteractive

root 164 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/170-msm_sdc

root 165 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/253-msm_sdc

root 166 2 0 0 0 -20 0 0 rescuer_th 00000000 S binder

root 167 2 0 0 0 -20 0 0 rescuer_th 00000000 S usb_bam_wq

root 168 2 0 0 10 -10 0 0 rfcomm_run 00000000 S krfcommd

root 169 2 0 0 0 -20 0 0 rescuer_th 00000000 S bam_dmux_rx

root 170 2 0 0 0 -20 0 0 rescuer_th 00000000 S bam_dmux_tx

root 171 2 0 0 0 -20 0 0 rescuer_th 00000000 S rq_stats

root 185 2 0 0 0 -20 0 0 rescuer_th 00000000 S deferwq

root 186 2 0 0 0 -20 0 0 rescuer_th 00000000 S sb-1

root 187 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/195-ngd_sli

root 188 2 0 0 20 0 0 0 ngd_slim_r 00000000 D ngd_rx_thread1

root 189 2 0 0 20 0 0 0 ngd_notify 00000000 D ngd_notify_sl1

root 193 2 0 0 20 0 0 0 mmc_queue_ 00000000 S mmcqd/0

root 194 2 0 0 20 0 0 0 mmc_queue_ 00000000 S mmcqd/0rpmb

root 195 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/299-bsi-bat

root 196 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/344-atmel_m

root 197 2 0 0 20 0 0 0 ir_raw_eve 00000000 S rc0

root 199 2 0 0 -99 0 98 1 do_hotplug 00000000 S msm_thermal:hot

root 200 2 0 0 -100 0 99 1 do_freq_mi 00000000 S msm_thermal:fre

root 201 2 0 0 20 0 0 0 do_thermal 00000000 S msm_thermal:the

root 202 2 0 0 20 0 0 0 boost_mig_ 00000000 S boost_sync/0

root 203 2 0 0 20 0 0 0 boost_mig_ 00000000 S boost_sync/1

root 204 2 0 0 20 0 0 0 boost_mig_ 00000000 S boost_sync/2

root 205 2 0 0 20 0 0 0 boost_mig_ 00000000 S boost_sync/3

root 208 1 2228 560 20 0 0 0 0 000684c8 R /sbin/ueventd

root 210 2 0 0 20 0 0 0 kjournald2 00000000 S jbd2/mmcblk0p23

root 211 2 0 0 0 -20 0 0 rescuer_th 00000000 S ext4-dio-unwrit

root 214 2 0 0 20 0 0 0 bdi_writeb 00000000 S flush-179:0

root 216 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:3

root 217 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:4

root 218 2 0 0 20 0 0 0 kjournald2 00000000 S jbd2/mmcblk0p25

root 219 2 0 0 0 -20 0 0 rescuer_th 00000000 S ext4-dio-unwrit

root 220 2 0 0 20 0 0 0 kjournald2 00000000 S jbd2/mmcblk0p24

root 221 2 0 0 0 -20 0 0 rescuer_th 00000000 S ext4-dio-unwrit

root 222 2 0 0 20 0 0 0 kjournald2 00000000 S jbd2/mmcblk0p21

root 223 2 0 0 0 -20 0 0 rescuer_th 00000000 S ext4-dio-unwrit

logd 224 1 24268 13224 20 0 0 3 sys_rt_sig b6d94c38 S /system/bin/logd

root 229 2 0 0 20 0 0 0 kauditd_th 00000000 S kauditd

root 231 1 9240 1724 20 0 0 0 hrtimer_na b6ce280c S /system/bin/vold

root 248 2 0 0 0 -20 0 0 rescuer_th 00000000 S IPCRTR

root 249 2 0 0 0 -20 0 0 rescuer_th 00000000 S ipc_rtr_q6_ipcr

root 263 2 0 0 20 0 0 0 kthread_wo 00000000 S msm_slim_qmi_cl

root 264 2 0 0 0 -20 0 0 rescuer_th 00000000 S msm_qmi_rtx_q

root 274 1 2460 428 20 0 0 0 sys_epoll_ 000371b0 S /sbin/healthd

root 275 1 3072 852 -2 0 1 1 sys_epoll_ b6f27984 S /system/bin/lmkd

system 276 1 3116 1048 20 0 0 0 binder_thr b6e13ab0 S /system/bin/servicemanager

system 277 1 119388 16320 12 -8 0 0 sys_epoll_ b6dff984 S /system/bin/surfaceflinger

root 279 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/288-wcd9xxx

nobody 280 1 9408 1148 20 0 0 0 poll_sched b6e91b74 S /system/bin/rmt_storage

system 281 1 4564 960 20 0 0 0 poll_sched b6e6ab74 S /system/bin/rfs_access

system 283 1 4300 1008 20 0 0 0 do_wait b6eb3234 S /system/bin/qseecomd

root 285 1 4080 1384 20 0 0 0 __skb_recv b6dada3c S zygote

root 288 1 16340 2088 20 0 0 0 hrtimer_na b6c9880c S /system/bin/netd

root 289 1 3804 1508 20 0 0 0 __skb_recv b6ddc8e8 S /system/bin/debuggerd

radio 290 1 58588 12436 20 0 0 0 hrtimer_na b6e4780c S /system/bin/rild

drm 291 1 16952 5360 20 0 0 0 binder_thr b6cc7ab0 S /system/bin/drmserver

media 292 1 156568 30032 20 0 0 0 binder_thr b6a73ab0 S /system/bin/mediaserver

root 293 1 2844 1072 20 0 0 0 unix_strea b6e3f960 S /system/bin/installd

keystore 295 1 5868 2264 20 0 0 0 binder_thr b6d12ab0 S /system/bin/keystore

system 297 1 39460 11312 20 0 0 0 binder_thr b6e58ab0 S /system/xbin/shelld

root 298 1 5840 1312 20 0 0 0 poll_sched b6e73b4c S /system/bin/qcom-system-daemon

media 302 1 3920 928 20 0 0 0 poll_sched b6df1b4c S /system/bin/adsprpcd

system 303 1 5904 1284 20 0 0 0 poll_sched b6d3db74 S /system/bin/imsqmidaemon

system 304 1 6684 2136 20 0 0 0 wcnss_wlan b6ea5960 S /system/bin/wcnss_service

root 305 1 1537176 67416 20 0 0 0 poll_sched b6d18b4c S zygote

root 306 1 3240 1276 20 0 0 0 __skb_recv b6ec58e8 S /system/xbin/su

root 307 1 6948 1408 20 0 0 0 binder_thr b6e25ab0 S /system/bin/fdpp

system 308 1 21744 1964 20 0 0 0 binder_thr b6d3eab0 S /system/bin/gatekeeperd

system 309 1 47100 13260 20 0 0 0 sys_epoll_ b6bd7984 S /system/bin/cnd

root 310 1 6600 1636 20 0 0 0 unix_strea b6d75960 S /system/bin/dpmd

gps 312 1 4504 1432 20 0 0 0 sys_rt_sig b6e7dc38 S /system/bin/loc_launcher

camera 315 1 70104 15840 20 0 0 0 poll_sched b6c79b74 S /system/bin/mm-qcamera-daemon

system 316 1 10720 1864 20 0 0 0 futex_wait b6ebf63c S /system/bin/time_daemon

system 318 1 17736 5324 20 0 0 0 binder_thr b6d28ab0 S /system/bin/audiod

root 319 1 8028 1592 20 0 0 0 binder_thr b6dffab0 S /system/bin/displayfeature

root 323 1 54256 2280 0 -20 0 0 sys_rt_sig b6dabc38 S /system/vendor/bin/thermal-engine

root 366 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/33-cpubw_hw

system 376 283 8536 656 20 0 0 0 sys_rt_sig b6eb1c38 S /system/bin/qseecomd

gps 378 312 10160 1668 20 0 0 0 futex_wait b6e0d63c S lowi-server

gps 379 312 19696 1352 20 0 0 0 futex_wait b6f0263c S xtwifi-inet-agent

gps 380 312 25480 4684 20 0 0 0 futex_wait b6ae063c S xtwifi-client

gps 381 312 19096 3492 20 0 0 0 poll_sched b6be5b4c S slim_daemon

root 394 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:5

nobody 398 1 3620 984 20 0 0 0 poll_sched b6e67b4c S /system/bin/hvdcp

system 399 1 47200 11644 20 0 0 0 do_sigtime b6e61c58 S /system/bin/mm-pp-daemon

radio 400 1 15240 1172 20 0 0 0 poll_sched b6bf3b74 S /system/bin/qmuxd

system 448 310 11384 2852 20 0 0 0 sys_epoll_ b6d74984 S /system/bin/dpmd

sensors 500 1 33168 1972 20 0 0 0 poll_sched b6d1bb74 S /system/bin/sensors.qcom

radio 501 1 17636 4016 20 0 0 0 __skb_recv b6b458e8 S /system/bin/netmgrd

system 514 1 7516 2048 20 0 0 0 poll_sched b6c33b74 S /system/bin/imsdatadaemon

root 583 2 0 0 -17 0 16 1 __mdss_fb_ 00000000 D mdss_fb0

system 625 1 3136 1216 20 0 0 0 poll_sched b6efab4c S /system/bin/charger_monitor

root 685 2 0 0 0 -20 0 0 rescuer_th 00000000 S IPCRTR

root 686 2 0 0 0 -20 0 0 rescuer_th 00000000 S ipc_rtr_smd_ipc

root 1040 2 0 0 0 -20 0 0 rescuer_th 00000000 S IPCRTR

root 1049 2 0 0 0 -20 0 0 rescuer_th 00000000 S ipc_rtr_wcnss_i

system 1617 305 1770916 154264 18 -2 0 0 sys_epoll_ b6d18984 S system_server

media_rw 3154 231 23152 4244 20 0 0 0 inotify_re b6dd8960 S /system/bin/sdcard

system 3176 305 1758100 187876 19 -1 0 0 sys_epoll_ b6d18984 S com.android.systemui

system 3329 305 794656 57348 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.networkassistant.deamon

system 3415 305 800188 74228 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.securitycenter.remote

system 3526 305 824224 75032 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.networkassistant.shadow

system 3552 305 806688 72764 19 -1 0 0 sys_epoll_ b6d18984 S com.securespaces.android.ssm.service

system 3688 305 762996 43216 19 -1 0 0 sys_epoll_ b6d18984 S com.quicinc.cne.CNEService

radio 3695 305 759060 41036 19 -1 0 0 sys_epoll_ b6d18984 S com.qualcomm.qcrilmsgtunnel

system 3724 305 778604 58660 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.whetstone

radio 3765 305 820188 72600 19 -1 0 0 sys_epoll_ b6d18984 S com.android.phone

radio 3952 305 797484 60688 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.voip

system 4004 305 806728 61720 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.powerkeeper:service

root 4089 1 2592 988 20 0 0 0 poll_sched b6e4cb4c S /system/bin/subsystem_ramdump

system 4109 305 771008 51468 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.antispam:provider

root 4707 1 5792 424 20 0 0 0 poll_sched 0002b0d4 S /sbin/adbd

system 4983 1 14088 2136 20 0 0 0 binder_thr b6e78ab0 S /system/bin/mcd

root 5062 1 8580 1148 13 -7 0 0 futex_wait b6d9763c S /system/bin/mpdecision

root 5078 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/3

root 5080 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/3:2H

root 5081 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/3

bluetooth 7608 305 768564 45644 19 -1 0 0 sys_epoll_ b6d18984 S com.android.bluetooth

system 9963 305 797436 48616 19 -1 0 0 sys_epoll_ b6d18984 S com.miui.bugreport:remote

root 13325 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:4

root 14779 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:1

root 15216 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:2

root 15641 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/3:2

root 15908 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:3

root 16517 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:6

root 16912 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:0

root 17318 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/3:1

root 17480 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/3:0H

root 18264 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/3:0

root 18605 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/0:2H

root 18637 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/3:1H

system 19099 305 755880 38060 19 -1 0 0 sys_epoll_ b6d18984 S com.qualcomm.svi

root 19190 4707 2808 1040 20 0 0 0 0 b6d9d960 R ps

root 19209 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/2

root 19210 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/2:0

root 19211 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/2:0H

root 19212 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/2

root 19213 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/1

root 19214 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/1:0

root 19215 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/1:0H

root 19216 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/1

root 19217 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/2:1

==========================================================================

其中, root 1 0 2488 780 20 0 0 0 sys_epoll_ 000710f4 S /init

对于init进程, 参考 http://www.cnblogs.com/nokiaguy/archive/2013/04/14/3020774.html 和 http://blog.csdn.net/hu3167343/article/details/38299969,

可以知道init进程是系统中的第一个用户空间进程, 主要工作职责有以下5点:

(1) 建立与内核文件(如设备驱动文件:/dev, 内存文件: /proc, /sys)相关的目录

(2) 初始化属性服务

(3) 处理配置文件的命令(主要是init.rc文件), 包括处理各种action

(4) 性能分析(使用bootchart工具)

(5) 无限循环执行command(启动其他进程, 如zygote)

其中, root 2 0 0 0 -2 0 1 1 kthreadd 00000000 S kthreadd

对于kthreadd进程, 参考 http://stackoverflow.com/questions/13390568/kernel-thread-kthreadd和 http://stackoverflow.com/questions/13390568/kernel-thread-kthreadd,

可以知道 kthreadd是守护进程, 主要是管理kworker进程(创建kworkder进程, 所以发现kworker的 parent pid都为2), 并且始终处于内核态.

可以看出有27个kworker进程 http://blog.chinaunix.net/uid-29616823-id-4470648.html 和

root 5 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/0:0H

root 6 2 0 0 20 0 0 0 msm_mpm_wo 00000000 D kworker/u:0

root 7 2 0 0 0 -20 0 0 msm_rpm_sm 00000000 D kworker/u:0H

root 23 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:1

root 27 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/0:1H

root 33 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/u:1H

root 216 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:3

root 217 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:4

root 394 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:5

root 5080 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/3:2H

root 13325 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:4

root 14779 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:1

root 15216 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:2

root 15641 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/3:2

root 15908 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:3

root 16517 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/u:6

root 16912 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/0:0

root 17318 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/3:1

root 17480 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/3:0H

root 18264 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/3:0

root 18605 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/0:2H

root 18637 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/3:1H

root 19210 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/2:0

root 19211 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/2:0H

root 19214 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/1:0

root 19215 2 0 0 0 -20 0 0 worker_thr 00000000 S kworker/1:0H

root 19217 2 0 0 20 0 0 0 worker_thr 00000000 S kworker/2:1

参考: http://askubuntu.com/questions/33640/kworker-what-is-it-and-why-is-it-hogging-so-much-cpu, 可以知道kworker的字面意思就是 kernel worker, 及linux系统的内核工作进程, 负责中断处理, 定时器, I/O等工作, kworkder后面的数字表明自己运行在哪个CPU的哪个核上.

出现了32个irq进程, 如下;

root 56 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/99-msm_iomm

root 57 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/105-msm_iom

root 58 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/77-msm_iomm

root 59 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/70-msm_iomm

root 60 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/94-msm_iomm

root 61 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/102-msm_iom

root 62 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/102-msm_iom

root 63 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/102-msm_iom

root 64 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/79-msm_iomm

root 65 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/78-msm_iomm

root 66 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/78-msm_iomm

root 67 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/74-msm_iomm

root 68 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 69 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 70 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 71 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/75-msm_iomm

root 72 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/273-msm_iom

root 73 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/273-msm_iom

root 74 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/273-msm_iom

root 75 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/97-msm_iomm

root 76 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/97-msm_iomm

root 77 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/97-msm_iomm

root 93 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/475-adsp

root 94 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/411-mba

root 95 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/539-wcnss

root 164 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/170-msm_sdc

root 165 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/253-msm_sdc

root 187 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/195-ngd_sli

root 195 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/299-bsi-bat

root 196 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/344-atmel_m

root 279 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/288-wcd9xxx

root 366 2 0 0 -51 0 50 1 irq_thread 00000000 S irq/33-cpubw_hw

参考: https://fypandroid.wordpress.com/2011/02/10/interrupt-requests-irqs/, 可以知道, irq: Interrupt Requesting, 即终端处理程序, 负责各种终端任务的处理工作, 来实现系统的多任务处理. 至于irq后面字符的意义, 就要查询代码了.

出现了4个ksoftirqd进程:

root 3 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/0

root 5081 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/3

root 19212 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/2

root 19216 2 0 0 20 0 0 0 run_ksofti 00000000 S ksoftirqd/1

参考 http://baike.baidu.com/link?url=LhgCGu2olaNTEDALt6pYw5a5M6b0LE-rbp3ok0u_LM0ZfOWgGPubJX1enqyctKoL_S5ttMazcfPjle7rmdbnza,

可以知道软中断与函数调用的主要区别在于:

软中断是linux系统原“底半处理”的升级，在原有的基础上发展的新的处理方式，以适应多cpu 、多线程的软中断处理。

软中断是实现系统API函数调用的手段

函数调用时将返回地址和CPU状态寄存器内容压栈，函数执行完毕后出栈返回断点继续执行。

软中断调用时将返回地址和CPU状态寄存器内容压栈，修改特权级，根据中断号查找中断向量表，找到ISR中断服务例程地址，跳转执行。

综上，函数调用和软中断调用的区别是，软中断多了修改特权级和查找中断向量表的功能，其他部分完全一样。

出现了4个migration进程:

root 8 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/0

root 5078 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/3

root 19209 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/2

root 19213 2 0 0 -100 0 99 1 cpu_stoppe 00000000 S migration/1

参考 http://superuser.com/questions/440906/what-is-the-migration-process,

可以知道 migration (移民) 进程主要作用就是在CPU核上移动任务作为负载均衡(每个核心上至少有1个migration进程), 它是 kernel process.

其中, root 21 2 0 0 0 -20 0 0 rescuer_th 00000000 S khelper

根据下列内核代码可以知道

/* This is run by khelper thread  */
static void __call_usermodehelper(struct work_struct *work)
{
struct subprocess_info *sub_info =
container_of(work, struct subprocess_info, work);
int wait = sub_info->wait & ~UMH_KILLABLE;
pid_t pid;

/* CLONE_VFORK: wait until the usermode helper has execve'd
* successfully We need the data structures to stay around
* until that is done.  */
if (wait == UMH_WAIT_PROC)
pid = kernel_thread(wait_for_helper, sub_info,
CLONE_FS | CLONE_FILES | SIGCHLD);
else
pid = kernel_thread(____call_usermodehelper, sub_info,
CLONE_VFORK | SIGCHLD);

switch (wait) {
case UMH_NO_WAIT:
call_usermodehelper_freeinfo(sub_info);
break;

case UMH_WAIT_PROC:
if (pid > 0)
break;
/* FALLTHROUGH */
case UMH_WAIT_EXEC:
if (pid < 0)
sub_info->retval = pid;
umh_complete(sub_info);
}
}

khelper进程主要是kernel进程与userspace进程交互的辅助进程.

其中, root 305 1 1537176 67416 20 0 0 0 poll_sched b6d18b4c S zygote

参考 http://blog.csdn.net/luoshengyang/article/details/6768304,

可以知道zygote进程主要功能如下;

1. 系统启动时init进程会创建Zygote进程，Zygote进程负责后续Android应用程序框架层的其它进程的创建和启动工作。

2. Zygote进程会首先创建一个SystemServer进程，SystemServer进程负责启动系统的关键服务，如包管理服务PackageManagerService和应用程序组件管理服务ActivityManagerService。

3. 当我们需要启动一个Android应用程序时，ActivityManagerService会通过Socket进程间通信机制，通知Zygote进程为这个应用程序创建一个新的进程。

参考资料:

整理Android手机，核心进程和线程情况: http://gityuan.com/2015/12/19/android-process-category/

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标签： android 进程管理

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