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Subject[RFC v2 00/17] perf: Add perf kwork
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Sometimes, we need to analyze time properties of kernel work such as irq,
softirq, and workqueue, including delay and running time of specific interrupts.
Currently, these events have kernel tracepoints, but perf tool does not
directly analyze the delay of these events

The perf-kwork tool is used to trace time properties of kernel work
(such as irq, softirq, and workqueue), including runtime, latency,
and timehist, using the infrastructure in the perf tools to allow
tracing extra targets

We also use bpf trace to collect and filter data in kernel to solve
problem of large perf data volume and extra file system interruptions.

Example usage:

1. Kwork record:

# perf kwork record -- sleep 10
[ perf record: Woken up 0 times to write data ]
[ perf record: Captured and wrote 6.825 MB perf.data ]

2. Kwork report:

# perf kwork report -S

Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
virtio0-requests:25 | 0000 | 1347.861 ms | 25049 | 1.417 ms | 121235.524083 s | 121235.525499 s |
(s)TIMER:1 | 0005 | 151.033 ms | 2545 | 0.153 ms | 121237.454591 s | 121237.454744 s |
(s)RCU:9 | 0005 | 117.254 ms | 2754 | 0.223 ms | 121239.461024 s | 121239.461246 s |
(s)SCHED:7 | 0005 | 58.714 ms | 1773 | 0.075 ms | 121237.702345 s | 121237.702419 s |
(s)RCU:9 | 0007 | 43.359 ms | 945 | 0.861 ms | 121237.702984 s | 121237.703845 s |
(s)SCHED:7 | 0000 | 33.389 ms | 549 | 4.121 ms | 121235.521379 s | 121235.525499 s |
(s)RCU:9 | 0002 | 21.419 ms | 484 | 0.281 ms | 121244.629001 s | 121244.629282 s |
(w)mix_interrupt_randomness | 0000 | 21.047 ms | 391 | 1.016 ms | 121237.934008 s | 121237.935024 s |
(s)SCHED:7 | 0007 | 19.903 ms | 570 | 0.065 ms | 121235.523360 s | 121235.523426 s |
(s)RCU:9 | 0000 | 19.017 ms | 472 | 0.507 ms | 121244.634002 s | 121244.634510 s |
... <SNIP> ...
(s)SCHED:7 | 0003 | 0.049 ms | 1 | 0.049 ms | 121240.018631 s | 121240.018680 s |
(w)vmstat_update | 0003 | 0.046 ms | 1 | 0.046 ms | 121240.916200 s | 121240.916246 s |
(s)RCU:9 | 0004 | 0.045 ms | 2 | 0.024 ms | 121235.522876 s | 121235.522900 s |
(w)neigh_managed_work | 0001 | 0.044 ms | 1 | 0.044 ms | 121235.513929 s | 121235.513973 s |
(w)vmstat_update | 0006 | 0.031 ms | 1 | 0.031 ms | 121245.673914 s | 121245.673945 s |
(w)vmstat_update | 0004 | 0.028 ms | 1 | 0.028 ms | 121235.522743 s | 121235.522770 s |
(w)wb_update_bandwidth_workfn | 0000 | 0.024 ms | 1 | 0.024 ms | 121244.842660 s | 121244.842683 s |
--------------------------------------------------------------------------------------------------------------------------------
Total count : 36071
Total runtime (msec) : 1887.188 (0.185% load average)
Total time span (msec) : 10185.012
--------------------------------------------------------------------------------------------------------------------------------

3. Kwork latency:

# perf kwork latency

Kwork Name | Cpu | Avg delay | Count | Max delay | Max delay start | Max delay end |
--------------------------------------------------------------------------------------------------------------------------------
(s)TIMER:1 | 0004 | 3.903 ms | 1 | 3.903 ms | 121235.517068 s | 121235.520971 s |
(s)RCU:9 | 0004 | 3.252 ms | 2 | 5.809 ms | 121235.517068 s | 121235.522876 s |
(s)RCU:9 | 0001 | 3.238 ms | 2 | 5.832 ms | 121235.514494 s | 121235.520326 s |
(w)vmstat_update | 0004 | 1.738 ms | 1 | 1.738 ms | 121235.521005 s | 121235.522743 s |
(s)SCHED:7 | 0004 | 0.978 ms | 2 | 1.899 ms | 121235.520940 s | 121235.522840 s |
(w)wb_update_bandwidth_workfn | 0000 | 0.834 ms | 1 | 0.834 ms | 121244.841826 s | 121244.842660 s |
(s)RCU:9 | 0003 | 0.479 ms | 3 | 0.752 ms | 121240.027521 s | 121240.028273 s |
(s)TIMER:1 | 0001 | 0.465 ms | 1 | 0.465 ms | 121235.513107 s | 121235.513572 s |
(w)vmstat_update | 0000 | 0.391 ms | 5 | 1.275 ms | 121236.814938 s | 121236.816213 s |
(w)mix_interrupt_randomness | 0002 | 0.317 ms | 5 | 0.874 ms | 121244.628034 s | 121244.628908 s |
(w)neigh_managed_work | 0001 | 0.315 ms | 1 | 0.315 ms | 121235.513614 s | 121235.513929 s |
... <SNIP> ...
(s)TIMER:1 | 0005 | 0.061 ms | 2545 | 0.506 ms | 121237.136113 s | 121237.136619 s |
(s)SCHED:7 | 0001 | 0.052 ms | 21 | 0.437 ms | 121237.711014 s | 121237.711451 s |
(s)SCHED:7 | 0002 | 0.045 ms | 309 | 0.145 ms | 121237.137184 s | 121237.137329 s |
(s)SCHED:7 | 0003 | 0.045 ms | 1 | 0.045 ms | 121240.018586 s | 121240.018631 s |
(s)SCHED:7 | 0007 | 0.044 ms | 570 | 0.173 ms | 121238.161161 s | 121238.161334 s |
(s)BLOCK:4 | 0003 | 0.030 ms | 4 | 0.056 ms | 121240.028255 s | 121240.028311 s |
--------------------------------------------------------------------------------------------------------------------------------
INFO: 28.761% skipped events (27674 including 2607 raise, 25067 entry, 0 exit)

4. Kwork timehist:

# perf kwork timehist
Runtime start Runtime end Cpu Kwork name Runtime Delaytime
(TYPE)NAME:NUM (msec) (msec)
----------------- ----------------- ------ ------------------------------ ---------- ----------
121235.513572 121235.513674 [0001] (s)TIMER:1 0.102 0.465
121235.513688 121235.513738 [0001] (s)SCHED:7 0.050 0.172
121235.513750 121235.513777 [0001] (s)RCU:9 0.027 0.643
121235.513929 121235.513973 [0001] (w)neigh_managed_work 0.044 0.315
121235.520326 121235.520386 [0001] (s)RCU:9 0.060 5.832
121235.520672 121235.520716 [0002] (s)SCHED:7 0.044 0.048
121235.520729 121235.520753 [0002] (s)RCU:9 0.024 5.651
121235.521213 121235.521249 [0005] (s)TIMER:1 0.036 0.064
121235.520166 121235.521379 [0000] (s)SCHED:7 1.213 0.056
... <SNIP> ...
121235.533256 121235.533296 [0000] virtio0-requests:25 0.040
121235.533322 121235.533359 [0000] (s)SCHED:7 0.037 0.095
121235.533018 121235.533452 [0006] (s)RCU:9 0.434 0.348
121235.534653 121235.534698 [0000] virtio0-requests:25 0.046
121235.535657 121235.535702 [0000] virtio0-requests:25 0.044
121235.535857 121235.535916 [0005] (s)TIMER:1 0.059 0.055
121235.535927 121235.535947 [0005] (s)RCU:9 0.020 0.113
121235.536178 121235.536196 [0006] (s)RCU:9 0.018 0.410
121235.537406 121235.537445 [0006] (s)SCHED:7 0.039 0.049
121235.537457 121235.537481 [0006] (s)RCU:9 0.024 0.334
121235.538199 121235.538254 [0007] (s)RCU:9 0.055 0.066

5. Kwork report use bpf:

# perf kwork report -b
Starting trace, Hit <Ctrl+C> to stop and report
^C
Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
(w)flush_to_ldisc | 0000 | 2.279 ms | 2 | 2.219 ms | 121293.080933 s | 121293.083152 s |
(s)SCHED:7 | 0001 | 2.141 ms | 2 | 2.100 ms | 121293.082064 s | 121293.084164 s |
(s)RCU:9 | 0003 | 2.137 ms | 3 | 2.046 ms | 121293.081348 s | 121293.083394 s |
(s)TIMER:1 | 0007 | 1.882 ms | 12 | 0.249 ms | 121295.632211 s | 121295.632460 s |
(w)e1000_watchdog | 0002 | 1.136 ms | 3 | 0.428 ms | 121294.496559 s | 121294.496987 s |
(s)SCHED:7 | 0007 | 0.995 ms | 12 | 0.139 ms | 121295.632483 s | 121295.632621 s |
(s)NET_RX:3 | 0002 | 0.727 ms | 5 | 0.391 ms | 121299.044624 s | 121299.045016 s |
(s)TIMER:1 | 0002 | 0.696 ms | 5 | 0.164 ms | 121294.496172 s | 121294.496337 s |
(s)SCHED:7 | 0002 | 0.427 ms | 6 | 0.077 ms | 121295.840321 s | 121295.840398 s |
(s)SCHED:7 | 0000 | 0.366 ms | 3 | 0.156 ms | 121296.545389 s | 121296.545545 s |
eth0:10 | 0002 | 0.353 ms | 5 | 0.122 ms | 121293.084796 s | 121293.084919 s |
(w)flush_to_ldisc | 0000 | 0.298 ms | 1 | 0.298 ms | 121299.046236 s | 121299.046534 s |
(w)mix_interrupt_randomness | 0002 | 0.215 ms | 4 | 0.077 ms | 121293.086747 s | 121293.086823 s |
(s)RCU:9 | 0002 | 0.128 ms | 3 | 0.060 ms | 121293.087348 s | 121293.087409 s |
(w)vmstat_shepherd | 0000 | 0.098 ms | 1 | 0.098 ms | 121293.083901 s | 121293.083999 s |
(s)TIMER:1 | 0001 | 0.089 ms | 1 | 0.089 ms | 121293.085709 s | 121293.085798 s |
(w)vmstat_update | 0003 | 0.071 ms | 1 | 0.071 ms | 121293.085227 s | 121293.085298 s |
(w)wq_barrier_func | 0000 | 0.064 ms | 1 | 0.064 ms | 121293.083688 s | 121293.083752 s |
(w)vmstat_update | 0000 | 0.041 ms | 1 | 0.041 ms | 121293.083829 s | 121293.083869 s |
(s)RCU:9 | 0001 | 0.038 ms | 1 | 0.038 ms | 121293.085818 s | 121293.085856 s |
(s)RCU:9 | 0007 | 0.035 ms | 1 | 0.035 ms | 121293.112322 s | 121293.112357 s |
--------------------------------------------------------------------------------------------------------------------------------

6. Kwork latency use bpf:

# perf kwork latency -b
Starting trace, Hit <Ctrl+C> to stop and report
^C
Kwork Name | Cpu | Avg delay | Count | Max delay | Max delay start | Max delay end |
--------------------------------------------------------------------------------------------------------------------------------
(w)vmstat_shepherd | 0000 | 2.044 ms | 2 | 2.764 ms | 121314.942758 s | 121314.945522 s |
(w)flush_to_ldisc | 0000 | 1.008 ms | 1 | 1.008 ms | 121317.335508 s | 121317.336516 s |
(w)vmstat_update | 0002 | 0.879 ms | 1 | 0.879 ms | 121317.024405 s | 121317.025284 s |
(w)mix_interrupt_randomness | 0002 | 0.328 ms | 5 | 0.383 ms | 121308.832944 s | 121308.833327 s |
(w)e1000_watchdog | 0002 | 0.304 ms | 5 | 0.368 ms | 121317.024305 s | 121317.024673 s |
(s)RCU:9 | 0001 | 0.172 ms | 41 | 0.728 ms | 121308.308187 s | 121308.308915 s |
(s)TIMER:1 | 0000 | 0.149 ms | 3 | 0.195 ms | 121317.334255 s | 121317.334449 s |
(s)NET_RX:3 | 0001 | 0.143 ms | 40 | 1.213 ms | 121315.030992 s | 121315.032205 s |
(s)RCU:9 | 0002 | 0.139 ms | 27 | 0.187 ms | 121315.077388 s | 121315.077576 s |
(s)NET_RX:3 | 0002 | 0.130 ms | 7 | 0.283 ms | 121308.832917 s | 121308.833201 s |
(s)SCHED:7 | 0007 | 0.123 ms | 34 | 0.191 ms | 121308.736240 s | 121308.736431 s |
(s)TIMER:1 | 0007 | 0.116 ms | 18 | 0.145 ms | 121308.736168 s | 121308.736313 s |
(s)RCU:9 | 0007 | 0.111 ms | 68 | 0.318 ms | 121308.736194 s | 121308.736512 s |
(s)SCHED:7 | 0002 | 0.110 ms | 22 | 0.292 ms | 121308.832197 s | 121308.832489 s |
(s)TIMER:1 | 0001 | 0.107 ms | 1 | 0.107 ms | 121314.948230 s | 121314.948337 s |
(w)neigh_managed_work | 0001 | 0.103 ms | 1 | 0.103 ms | 121314.948381 s | 121314.948484 s |
(s)RCU:9 | 0000 | 0.099 ms | 49 | 0.289 ms | 121308.520167 s | 121308.520456 s |
(s)NET_RX:3 | 0007 | 0.096 ms | 40 | 1.227 ms | 121315.022994 s | 121315.024220 s |
(s)RCU:9 | 0003 | 0.093 ms | 37 | 0.261 ms | 121314.950651 s | 121314.950913 s |
(w)flush_to_ldisc | 0000 | 0.090 ms | 1 | 0.090 ms | 121317.336737 s | 121317.336827 s |
(s)TIMER:1 | 0002 | 0.078 ms | 36 | 0.115 ms | 121310.880172 s | 121310.880288 s |
(s)SCHED:7 | 0001 | 0.071 ms | 27 | 0.180 ms | 121314.953571 s | 121314.953751 s |
(s)SCHED:7 | 0000 | 0.066 ms | 28 | 0.344 ms | 121317.334345 s | 121317.334689 s |
(s)SCHED:7 | 0003 | 0.063 ms | 14 | 0.119 ms | 121314.978808 s | 121314.978927 s |
--------------------------------------------------------------------------------------------------------------------------------

7. Kwork report with filter:

# perf kwork report -b -n RCU
Starting trace, Hit <Ctrl+C> to stop and report
^C
Kwork Name | Cpu | Total Runtime | Count | Max runtime | Max runtime start | Max runtime end |
--------------------------------------------------------------------------------------------------------------------------------
(s)RCU:9 | 0006 | 2.266 ms | 3 | 2.158 ms | 121335.008290 s | 121335.010449 s |
(s)RCU:9 | 0002 | 0.158 ms | 3 | 0.063 ms | 121335.011914 s | 121335.011977 s |
(s)RCU:9 | 0007 | 0.082 ms | 1 | 0.082 ms | 121335.448378 s | 121335.448460 s |
(s)RCU:9 | 0000 | 0.058 ms | 1 | 0.058 ms | 121335.011350 s | 121335.011408 s |
--------------------------------------------------------------------------------------------------------------------------------

Yang Jihong (17):
perf kwork: New tool
perf kwork: Add irq kwork record support
perf kwork: Add softirq kwork record support
perf kwork: Add workqueue kwork record support
tools lib: Add list_last_entry_or_null
perf kwork: Implement perf kwork report
perf kwork: Add irq report support
perf kwork: Add softirq report support
perf kwork: Add workqueue report support
perf kwork: Implement perf kwork latency
perf kwork: Add softirq latency support
perf kwork: Add workqueue latency support
perf kwork: Implement perf kwork timehist
perf kwork: Implement bpf trace
perf kwork: Add irq trace bpf support
perf kwork: Add softirq trace bpf support
perf kwork: Add workqueue trace bpf support

tools/include/linux/list.h | 11 +
tools/perf/Build | 1 +
tools/perf/Documentation/perf-kwork.txt | 180 ++
tools/perf/Makefile.perf | 1 +
tools/perf/builtin-kwork.c | 1834 ++++++++++++++++++++
tools/perf/builtin.h | 1 +
tools/perf/command-list.txt | 1 +
tools/perf/perf.c | 1 +
tools/perf/util/Build | 1 +
tools/perf/util/bpf_kwork.c | 356 ++++
tools/perf/util/bpf_skel/kwork_trace.bpf.c | 381 ++++
tools/perf/util/kwork.h | 257 +++
12 files changed, 3025 insertions(+)
create mode 100644 tools/perf/Documentation/perf-kwork.txt
create mode 100644 tools/perf/builtin-kwork.c
create mode 100644 tools/perf/util/bpf_kwork.c
create mode 100644 tools/perf/util/bpf_skel/kwork_trace.bpf.c
create mode 100644 tools/perf/util/kwork.h

Changes since v1:
- Add options and document when actually add the functionality later.
- Replace "cluster" with "work".
- Add workqueue symbolizing function support.
- Replace "frequency" with "count" in report header.
- Add bpf trace support.

--
2.30.GIT

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