htop
使用：htop -p id
编译：BR2_PACKAGE_HTOP
perf
系统性能分析工具，
使用：perf top -p 589
编译内核工具：linux-4.9.11/tools/perf 或者 BR2_PACKAGE_PERF
make ARCH=arm CROSS_COMPILE=/home/wangyubo/imx6ul-Foton-4GTBOX/logread-build-tools/LGQ-FT02/openwrt/staging_dir/toolchain-arm_gcc-imx6ul/bin/arm-linux-gnueabihf-
top信息：ucand收数据然后群发给basevdr，nev，ifoton
Mem: 98900K used, 151752K free, 0K shrd, 18300K buff, 18680K cached
CPU: 25.0% usr 62.9% sys 0.0% nic 12.0% idle 0.0% io 0.0% irq 0.0% sirq
Load average: 1.96 0.78 0.29 1/124 4878
PID PPID USER STAT VSZ %VSZ CPU %CPU COMMAND
610 1 root S 2140 0.8 0 14.8 /usr/sbin/ucand -B
564 1 root S 29952 11.8 0 12.0 basevdrd -s /dev/ttymxc1 -B
2696 1 root S 21624 8.5 0 12.0 nevd -B
2773 2767 root S 13240 5.2 0 11.1 ifotond
2767 1 root S 40148 15.9 0 5.5 ifotond
499 1 root S 9684 3.8 0 3.7 /usr/sbin/tigerfaced -l 3 -B
203 1 root S 1540 0.6 0 3.7 /usr/sbin/uild -s /dev/ttymxc2 -B
495 1 root S 1772 0.7 0 1.8 /sbin/ubusd
4848 4000 root R 1488 0.5 0 1.8 top -d 1ucan
PerfTop: 307 irqs/sec kernel:87.9% exact: 0.0% [4000Hz cpu-clock], (target_pid: 610)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
28.03% [kernel] [k] __wake_up_sync_key
13.57% [kernel] [k] finish_task_switch
4.37% [kernel] [k] unix_stream_sendmsg
1.92% [kernel] [k] preempt_count_sub
1.91% [kernel] [k] copy_from_iter
1.46% [kernel] [k] vfs_write
1.45% [kernel] [k] sock_alloc_send_pskb
1.42% [kernel] [k] __kmalloc_track_caller
1.35% [kernel] [k] __memzero
1.31% [kernel] [k] skb_queue_tail
1.24% [kernel] [k] skb_set_owner_w
1.23% [kernel] [k] __slab_free
1.21% [kernel] [k] rcu_read_unlock_special
1.16% [kernel] [k] __vfs_write
1.11% [kernel] [k] __usb_hcd_giveback_urb
1.10% [kernel] [k] kmem_cache_alloc
1.06% [kernel] [k] unix_stream_read_generic
1.01% [kernel] [k] sock_def_readable
1.00% [kernel] [k] __alloc_skbbasevdr
PerfTop: 251 irqs/sec kernel:70.5% exact: 0.0% [4000Hz cpu-clock], (target_pid: 564)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
10.79% [kernel] [k] finish_task_switch
3.70% [kernel] [k] __wake_up_sync_key
1.99% [kernel] [k] hrtimer_start_range_ns
1.89% [kernel] [k] preempt_count_sub
1.59% [kernel] [k] ipt_do_table
1.24% [kernel] [k] hrtimer_try_to_cancel
1.10% [kernel] [k] tcp_transmit_skb
1.05% [kernel] [k] clocksource_mmio_readl_up
0.98% [kernel] [k] tcp_sendmsg
0.95% [kernel] [k] sys_epoll_wait
0.95% [kernel] [k] preempt_count_add
0.89% [kernel] [k] tcp_v4_rcv
0.88% [kernel] [k] unix_stream_read_generic
0.88% [kernel] [k] arm_copy_to_usernev
PerfTop: 186 irqs/sec kernel:65.6% exact: 0.0% [4000Hz cpu-clock], (target_pid: 2696)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
15.25% [kernel] [k] finish_task_switch
6.26% [kernel] [k] hrtimer_start_range_ns
3.27% [kernel] [k] sys_epoll_wait
2.97% [kernel] [k] clocksource_mmio_readl_up
1.86% [kernel] [k] select_estimate_accuracy
1.67% [kernel] [k] ktime_get_ts64
1.66% [kernel] [k] preempt_count_sub
1.54% [kernel] [k] hrtimer_try_to_cancel
1.52% [kernel] [k] schedule
1.49% [kernel] [k] __wake_up_sync_key
1.29% [kernel] [k] unix_stream_read_generic
1.02% [kernel] [k] set_normalized_timespec64
1.00% [kernel] [k] vector_swi
0.99% [kernel] [k] arm_copy_to_userifoton
PerfTop: 135 irqs/sec kernel:80.7% exact: 0.0% [4000Hz cpu-clock], (target_pid: 2773)
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
18.50% [kernel] [k] finish_task_switch
5.52% [kernel] [k] hrtimer_start_range_ns
3.19% [kernel] [k] vector_swi
3.18% [kernel] [k] sys_epoll_wait
2.73% [kernel] [k] do_msgsnd
2.58% [kernel] [k] clocksource_mmio_readl_up
2.53% [kernel] [k] select_estimate_accuracy
2.13% [kernel] [k] preempt_count_sub
2.06% [kernel] [k] ktime_get_ts64
1.51% [kernel] [k] __kmalloc
1.50% [kernel] [k] schedule_hrtimeout_range_clock
1.50% [kernel] [k] __usb_hcd_giveback_urb
1.49% [kernel] [k] hrtimer_init还有其他更多使用方法待挖掘