softirqs顾名思义，用于跟踪软中断事件，主要用于软中断处理时延的跟踪
老样子，看下help帮助
usage: softirqs [-h] [-T] [-N] [-d] [interval] [count] Summarize soft irq event time as histograms. positional arguments: interval output interval, in seconds count number of outputs optional arguments: -h, --help show this help message and exit -T, --timestamp include timestamp on output 显示时间戳 -N, --nanoseconds output in nanoseconds 输出采用ns为单位 -d, --dist show distributions as histograms 采用矩形图显示各软中断执行时间
下面举例分析之：
./softirqs
Tracing soft irq event time... Hit Ctrl-C to end. ^C SOFTIRQ TOTAL_usecs 采用的us显示 net_tx 2 block 35 rcu 73 net_rx 251 sched 2533 timer 19682
./softirqs -d
softirq = net_tx_action usecs : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 440 | | 512 -> 1023 : 27613 |****************************************| 1024 -> 2047 : 5728 |******** | softirq = net_rx_action usecs : count distribution 0 -> 1 : 0 | | 2 -> 3 : 0 | | 4 -> 7 : 0 | | 8 -> 15 : 0 | | 16 -> 31 : 0 | | 32 -> 63 : 0 | | 64 -> 127 : 0 | | 128 -> 255 : 0 | | 256 -> 511 : 0 | | 512 -> 1023 : 6 | | 1024 -> 2047 : 35 | | 2048 -> 4095 : 3562 |**************** | 4096 -> 8191 : 7023 |******************************** | 8192 -> 16383 : 8770 |****************************************|
./softirqs -NT 1
每隔1s显示软中断时延，并打印时间戳
04:07:34 SOFTIRQ TOTAL_nsecs net_tx 2752 tasklet 57284 net_rx 70810 rcu 76245 sched 552705 timer 3755817 04:07:35 SOFTIRQ TOTAL_nsecs rcu 1607 block 11197 net_rx 107748 sched 489969 timer 4740185 04:07:36 SOFTIRQ TOTAL_nsecs rcu 48359 net_rx 105147 sched 439390 timer 3234368 04:07:37 SOFTIRQ TOTAL_nsecs block 12470 net_rx 161782 rcu 530526 sched 598443 timer 4353594