得到进程的pid：
ps -ef | grep process_name | grep -v "grep" | awk '{print $2}'
查看进程的所有线程
# ps mp 6648 -o THREAD,tid
USER %CPU PRI SCNT WCHAN USER SYSTEM TID
root 0.0 - - - - - -
root 0.0 24 - - - - 6648
root 0.0 21 - - - - 6650
root 1.0 24 - - - - 14214
root 0.0 23 - futex_ - - 14216
root 0.0 22 - 184466 - - 15374
root 0.0 23 - 184466 - - 15376
root 0.0 23 - 184466 - - 15378
root 0.0 23 - 184466 - - 15380
root 0.0 23 - 184466 - - 15392
root 0.0 23 - 184466 - - 15394
root 0.0 23 - 184466 - - 15398
查看所有子进程：
# pstree -p 6648
agent_executor(6648)─┬─tar(15601)───gzip(15607)
├─{agent_executor}(6650)
├─{agent_executor}(14214)
├─{agent_executor}(14216)
├─{agent_executor}(15374)
├─{agent_executor}(15376)
├─{agent_executor}(15378)
├─{agent_executor}(15380)
├─{agent_executor}(15392)
├─{agent_executor}(15394)
└─{agent_executor}(15398)
查看/proc/pid/status可以看到一些进程的当前状态：
Name: bash
State: S (sleeping)
SleepAVG: 98%
Tgid: 11237
Pid: 11237
PPid: 11235
TracerPid: 0
Uid: 0 0 0 0
Gid: 0 0 0 0
FDSize: 256
Groups: 0 1 2 3 4 6 10
VmPeak: 66260 kB
VmSize: 66228 kB
VmLck: 0 kB
VmHWM: 1684 kB
VmRSS: 1684 kB
VmData: 456 kB
VmStk: 88 kB
VmExe: 712 kB
VmLib: 1508 kB
VmPTE: 68 kB
StaBrk: 008c3000 kB
Brk: 011b1000 kB
StaStk: 7fff8b728170 kB
Threads: 1
SigQ: 1/30222
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000010000
SigIgn: 0000000000384004
SigCgt: 000000004b813efb
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff
Cpus_allowed: 00000000,00000000,00000000,00000000,00000000,00000000,00000000,00000003
Mems_allowed: 1