1671472 - Implement dispatcher & IPC for Timing Distributions in FOG

Status: RESOLVED FIXED

(Toolkit :: Telemetry, task, P1)

Description

[Chris H-C :chutten]

Docs for IPC and Dispatcher stuff can be found here.

Timing Distribution samples need to be sent across IPC from non-main processes and dispatched off the instrumenting thread in the main process.

Since the sample calculations are done in the core this'll probably need to be more of an ordered command stream of {Start|Stop|Cancel, TimerId, Instant} structs.

Comment 2

[Chris H-C :chutten]

Attachment: Bug 1671472 - Implement Dispatcher and IPC support for FOG Timing Distributions r?janerik!

We have to generate TimerIds in child processes because they're returned
synchronously from start(). This means each TimerId has to be process-local,
unless we go to some serious effort coordinating which TimerIds can be assigned
by which processes (let's not do that).

If the TimerId is process-local then we need not send a command stream of
start(), stop_and_accumulate(), and cancel() commands each with their Instant
of execution... we can calculate the durations ourselves, process-locally.

(( We could use std::time::Instant for this since we're process-local and not
trying to Send or Serialize them anywhere, but I opted for fog::private::Instant
for consistency's sake. ))

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/1a292b7fdbdc
Implement Dispatcher and IPC support for FOG Timing Distributions r=janerik

Comment 4

[Atila Butkovits]

https://hg.mozilla.org/mozilla-central/rev/1a292b7fdbdc