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tetragon: Add buffer between perf reader and events processing code #593

Merged
merged 2 commits into from
Sep 6, 2023
Merged

tetragon: Add buffer between perf reader and events processing code #593

merged 2 commits into from
Sep 6, 2023

Commits on Sep 1, 2023

  1. tetragon: Add queue between perf reader and sensor processing code 

    Adding extra layer between perf ring buffer reader and event
processing by sensor code.

Basically it's new channel (default size 65k) that is written by
perf ringbuffer reader and read by new go routine that processes
these events.

This way we keep the perf reader fast and we won't get lost events
if sensor processing code have a hiccup and takes longer.

When the eventsQueue channel is full we drop the event. It's configurable
by new --rb-queue-size option, the default is 65k.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    @olsajiri
    olsajiri committed Sep 1, 2023
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  2. tetragon: Add events buffer queue metrics 

    Adding following metric counters for events buffer queue:

  ringbufqueuemetrics.Received - number of records received from perf event reader go routine
  ringbufqueuemetrics.Lost     - number of records lost because the RB Queue channel was full

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
    @olsajiri
    olsajiri committed Sep 1, 2023
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