[Bug bpf/23477] New: userspace variant of timer probes for bpf

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=23477

            Bug ID: 23477
           Summary: userspace variant of timer probes for bpf
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: me at serhei dot io
  Target Milestone: ---

Needed to support 'iotop.stp' style scripts as discussed in
https://sourceware.org/ml/systemtap/2018-q3/msg00029.html

From the 'language features' brainstorm:

# Timer probes

In addition to the perf-event based timers, there should be a timer probe that
runs in user space (without the limitations of kernel ebpf). This is needed to
support the common pattern of scripts that iterate through their associative
arrays and print a report every N seconds.

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