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lib
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drwxr-xr-x
2025-11-05 21:34
argdist_example.txt
22.49
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bashreadline_example.txt
882
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bindsnoop_example.txt
4.42
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biolatency_example.txt
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biolatpcts_example.txt
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biopattern_example.txt
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biosnoop_example.txt
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biotop_example.txt
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bitesize_example.txt
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bpflist_example.txt
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btrfsdist_example.txt
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btrfsslower_example.txt
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cachestat_example.txt
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cachetop_example.txt
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capable_example.txt
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cobjnew_example.txt
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compactsnoop_example.txt
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cpudist_example.txt
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cpuunclaimed_example.txt
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criticalstat_example.txt
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cthreads_example.txt
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dbslower_example.txt
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dbstat_example.txt
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dcsnoop_example.txt
4.27
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dcstat_example.txt
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deadlock_example.txt
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dirtop_example.txt
4.98
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drsnoop_example.txt
5
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execsnoop_example.txt
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exitsnoop_example.txt
6.22
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ext4dist_example.txt
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ext4slower_example.txt
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filegone_example.txt
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filelife_example.txt
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fileslower_example.txt
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filetop_example.txt
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funccount_example.txt
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funcinterval_example.txt
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funclatency_example.txt
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funcslower_example.txt
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gethostlatency_example.txt
1.29
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hardirqs_example.txt
37.05
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inject_example.txt
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javacalls_example.txt
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javaflow_example.txt
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javagc_example.txt
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javaobjnew_example.txt
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javastat_example.txt
2.98
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javathreads_example.txt
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killsnoop_example.txt
1.31
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klockstat_example.txt
8.34
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kvmexit_example.txt
11.63
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llcstat_example.txt
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mdflush_example.txt
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memleak_example.txt
10.02
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mountsnoop_example.txt
1.45
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mysqld_qslower_example.txt
2.3
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netqtop_example.txt
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nfsdist_example.txt
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nfsslower_example.txt
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nodegc_example.txt
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nodestat_example.txt
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offcputime_example.txt
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offwaketime_example.txt
37.36
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oomkill_example.txt
1.88
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opensnoop_example.txt
10.33
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perlcalls_example.txt
3.91
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perlflow_example.txt
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perlstat_example.txt
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phpcalls_example.txt
3.91
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phpflow_example.txt
5.88
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phpstat_example.txt
2.98
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pidpersec_example.txt
677
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ppchcalls_example.txt
6.93
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profile_example.txt
31.08
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pythoncalls_example.txt
3.91
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pythonflow_example.txt
5.88
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pythongc_example.txt
3.78
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pythonstat_example.txt
2.98
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rdmaucma_example.txt
1.94
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readahead_example.txt
3.17
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reset-trace_example.txt
9.15
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rubycalls_example.txt
3.91
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rubyflow_example.txt
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rubygc_example.txt
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rubyobjnew_example.txt
2.97
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rubystat_example.txt
2.98
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runqlat_example.txt
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runqlen_example.txt
11.85
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runqslower_example.txt
2.13
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shmsnoop_example.txt
2.73
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slabratetop_example.txt
5.22
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sofdsnoop_example.txt
3.14
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softirqs_example.txt
11.02
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solisten_example.txt
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sslsniff_example.txt
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stackcount_example.txt
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statsnoop_example.txt
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swapin.txt
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swapin_example.txt
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syncsnoop_example.txt
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syscount_example.txt
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tclcalls_example.txt
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tclflow_example.txt
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tclobjnew_example.txt
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tclstat_example.txt
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tcpaccept_example.txt
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tcpcong_example.txt
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tcpconnect_example.txt
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tcpconnlat_example.txt
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tcpdrop_example.txt
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tcplife_example.txt
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tcpretrans_example.txt
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tcprtt_example.txt
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tcpstates_example.txt
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tcpsubnet_example.txt
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tcpsynbl_example.txt
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tcptop_example.txt
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tcptracer_example.txt
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threadsnoop_example.txt
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tplist_example.txt
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trace_example.txt
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ttysnoop_example.txt
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vfscount_example.txt
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vfsstat_example.txt
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virtiostat_example.txt
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wakeuptime_example.txt
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xfsdist_example.txt
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xfsslower_example.txt
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zfsdist_example.txt
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zfsslower_example.txt
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Save
Rename
Demonstrations of softirqs, the Linux eBPF/bcc version. This program traces soft interrupts (irqs), and stores timing statistics in-kernel for efficiency. For example: # ./softirqs Tracing soft irq event time... Hit Ctrl-C to end. ^C SOFTIRQ TOTAL_usecs rcu_process_callbacks 974 run_rebalance_domains 1809 run_timer_softirq 2615 net_tx_action 14605 tasklet_action 38692 net_rx_action 88188 The SOFTIRQ column prints the interrupt action function name. While tracing, the net_rx_action() soft interrupt ran for 20199 microseconds (20 milliseconds) in total. This tool works by dynamic tracing the individual softirq functions, and will need to be adjusted to match kernel/module changes. Future versions should use the softirq tracepoints instead. An interval can be provided, and also optionally a count. Eg, printing output every 1 second, and including timestamps (-T): # ./softirqs -T 1 3 Tracing soft irq event time... Hit Ctrl-C to end. 22:29:16 SOFTIRQ TOTAL_usecs rcu_process_callbacks 456 run_rebalance_domains 1005 run_timer_softirq 1196 net_tx_action 2796 tasklet_action 5534 net_rx_action 15075 22:29:17 SOFTIRQ TOTAL_usecs rcu_process_callbacks 456 run_rebalance_domains 839 run_timer_softirq 1142 net_tx_action 1912 tasklet_action 4428 net_rx_action 14652 22:29:18 SOFTIRQ TOTAL_usecs rcu_process_callbacks 502 run_rebalance_domains 840 run_timer_softirq 1192 net_tx_action 2341 tasklet_action 5496 net_rx_action 15656 This can be useful for quantifying where CPU cycles are spent among the soft interrupts (summarized as the %softirq column from mpstat(1), and shown as event counts in /proc/softirqs). The output above shows that most time was spent processing net_rx_action(), which was around 15 milliseconds per second (total time across all CPUs). The distribution of interrupt run time can be printed as a histogram with the -d option. Eg: # ./softirqs -d Tracing soft irq event time... Hit Ctrl-C to end. ^C 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 |******** | 2048 -> 4095 : 439 | | 4096 -> 8191 : 53 | | 8192 -> 16383 : 2 | | 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 |****************************************| 16384 -> 32767 : 1780 |******** | 32768 -> 65535 : 216 | | 65536 -> 131071 : 4 | | softirq = tasklet_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 : 95 | | 512 -> 1023 : 12521 |****************************************| 1024 -> 2047 : 1068 |*** | 2048 -> 4095 : 1077 |*** | 4096 -> 8191 : 12349 |*************************************** | 8192 -> 16383 : 464 |* | 16384 -> 32767 : 1 | | softirq = rcu_process_callbacks 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 : 708 |****************************************| 1024 -> 2047 : 495 |*************************** | 2048 -> 4095 : 98 |***** | 4096 -> 8191 : 62 |*** | 8192 -> 16383 : 4 | | softirq = run_timer_softirq 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 : 2 | | 512 -> 1023 : 366 |********* | 1024 -> 2047 : 1525 |****************************************| 2048 -> 4095 : 629 |**************** | 4096 -> 8191 : 87 |** | 8192 -> 16383 : 1 | | softirq = run_rebalance_domains 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 : 3 | | 512 -> 1023 : 18 |* | 1024 -> 2047 : 80 |******** | 2048 -> 4095 : 374 |****************************************| 4096 -> 8191 : 257 |*************************** | 8192 -> 16383 : 50 |***** | 16384 -> 32767 : 24 |** | Sometimes you just want counts of events, and don't need the distribution of times. You can use the -C or --events option: # ./softirqs.py -C Tracing soft irq events... Hit Ctrl-C to end. ^C SOFTIRQ TOTAL_count block 5 tasklet 6 net_rx 402 sched 5251 rcu 5748 timer 9530 USAGE message: # ./softirqs -h usage: softirqs [-h] [-T] [-N] [-C] [-d] [-c CPU] [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 -N, --nanoseconds output in nanoseconds -C, --events show the number of soft irq events -d, --dist show distributions as histograms -c CPU, --cpu CPU trace this CPU only examples: ./softirqs # sum soft irq event time ./softirqs -C # show the number of soft irq events ./softirqs -d # show soft irq event time as histograms ./softirqs 1 10 # print 1 second summaries, 10 times ./softirqs -NT 1 # 1s summaries, nanoseconds, and timestamps ./softirqs -c 1 # sum soft irq event time on CPU 1 only