android重要进程的主要功能

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);elsepid = 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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