1106040 - Missing Gecko entry in threadHangStats

Status: RESOLVED FIXED

(Toolkit :: Telemetry, defect)

Description

[Roberto Agostino Vitillo (:rvitillo)]

I have noticed that some Firefox pings from nightly that have BHR data are missing an entry for Gecko:, e.g.

[ {
  "name" : "Compositor",
  "hangs" : [ ],
  "activity" : {
    "bucket_count" : 33,
    "log_sum_squares" : 0,
    "log_sum" : 0,
    "range" : [ 1, 0 ],
    "values" : {
      "15" : 80,
      "31" : 169,
      "1" : 685761,
      "0" : 0,
      "3" : 37,
      "63" : 39,
      "7" : 29,
      "127" : 2,
      "255" : 0
    },
    "histogram_type" : 0,
    "sum" : 0
  }
}, {
  "name" : "ImageBridgeChild",
  "hangs" : [ ],
  "activity" : {
    "bucket_count" : 33,
    "log_sum_squares" : 0,
    "log_sum" : 0,
    "range" : [ 1, 0 ],
    "values" : {
      "1" : 8,
      "0" : 0,
      "3" : 0
    },
    "histogram_type" : 0,
    "sum" : 0
  }
} ]

About 1 every 1000 pings show this artefact. Jim, any idea why is that?

Comment 1

[(inactive) Jim Chen [:jchen] [:darchons]]

Hmm I'm not sure. Can you send me some of the pings so I can take a look? We register the Gecko thread for the "main" process (system process on B2G), so other types of processes like content processes and plugin processes wouldn't have a Gecko thread. However, I don't think these other processes currently send telemetry.

Comment 2

[Roberto Agostino Vitillo (:rvitillo)]

I have sent you an e-mail with some pings.

Comment 3

[Chris H-C :chutten]

Doug, do you happen to know if this is still relevant?

Comment 4

[Alex Thayer [:alexical] (she/her)]

If there was a legitimate bug that was causing it, I can't say that it's fixed, but the symptom described doesn't really have any meaning anymore, since the hangs in the new BHR ping are all flattened, so not having any 'Gecko' hangs would simply mean that no hangs occurred in the main thread of the chrome process. This might also have been what was happening before anyway, but I'm not sure.

Comment 5

[Chris H-C :chutten]

Good enough for me.