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threadsnoop: use strftime instead of elapsed #2917

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Jan 17, 2024
Merged

threadsnoop: use strftime instead of elapsed #2917

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2 changes: 2 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,8 @@ and this project adheres to
- [#2876](https://github.com/iovisor/bpftrace/pull/2876)
- Use `strftime` instead of `elapsed` in `execsnoop.bt`
- [#2904](https://github.com/iovisor/bpftrace/pull/2904)
- Use `strftime` instead of `elapsed` in `threadsnoop.bt`
- [#2917](https://github.com/iovisor/bpftrace/pull/2917)
- Update runqlen.bt to remove `runnable_weight` field from cfs_rq struct.
- [#2790](https://github.com/iovisor/bpftrace/pull/2790)
- Update mdflush.bt to use blkdev.h instead of genhd.h for non-BTF builds.
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4 changes: 2 additions & 2 deletions tools/threadsnoop.bt
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Expand Up @@ -15,12 +15,12 @@

BEGIN
{
printf("%-10s %-6s %-16s %s\n", "TIME(ms)", "PID", "COMM", "FUNC");
printf("%-15s %-6s %-16s %s\n", "TIME", "PID", "COMM", "FUNC");
}

uprobe:libpthread:pthread_create,
uprobe:libc:pthread_create
{
printf("%-10u %-6d %-16s %s\n", elapsed / 1e6, pid, comm,
printf("%15s %-6d %-16s %s\n", strftime("%H:%M:%S.%f", nsecs), pid, comm,
usym(arg2));
}
28 changes: 14 additions & 14 deletions tools/threadsnoop_example.txt
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Expand Up @@ -5,20 +5,20 @@ Tracing new threads via phtread_create():

# ./threadsnoop.bt
Attaching 2 probes...
TIME(ms) PID COMM FUNC
1938 28549 dockerd threadentry
1939 28549 dockerd threadentry
1939 28549 dockerd threadentry
1940 28549 dockerd threadentry
1949 28549 dockerd threadentry
1958 28549 dockerd threadentry
1939 28549 dockerd threadentry
1950 28549 dockerd threadentry
2013 28579 docker-containe 0x562f30f2e710
2036 28549 dockerd threadentry
2083 28579 docker-containe 0x562f30f2e710
2116 629 systemd-journal 0x7fb7114955c0
2116 629 systemd-journal 0x7fb7114955c0
TIME PID COMM FUNC
10:20:31.938572 28549 dockerd threadentry
10:20:31.939213 28549 dockerd threadentry
10:20:31.939405 28549 dockerd threadentry
10:20:31.940642 28549 dockerd threadentry
10:20:31.949060 28549 dockerd threadentry
10:20:31.958319 28549 dockerd threadentry
10:20:31.939152 28549 dockerd threadentry
10:20:31.950978 28549 dockerd threadentry
10:20:32.013269 28579 docker-containe 0x562f30f2e710
10:20:32.036764 28549 dockerd threadentry
10:20:32.083780 28579 docker-containe 0x562f30f2e710
10:20:32.116738 629 systemd-journal 0x7fb7114955c0
10:20:32.116844 629 systemd-journal 0x7fb7114955c0
[...]

The output shows a dockerd process creating several threads with the start
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