1896609 - FOG: Memory reporter for all generated metrics

Status: RESOLVED FIXED

(Data Platform and Tools :: Glean: SDK, task, P1)

Description

[Jan-Erik Rediger [:janerik] (Away 2026-04-02 - 2026-04-10)]

Split of bug 1805996.
Measuring the memory usage of all metrics is a bit ... complex.
The straight-forward way of calling size_of on every metric object leads to generating a function that is in the top 30 of largest functions. We might need to rethink how to do that.

Comment 1

[Jan-Erik Rediger [:janerik] (Away 2026-04-02 - 2026-04-10)]

Attachment: Bug 1896609 - FOG: Report memory size of all (instantiated) metrics r?chutten!

This requires a Glean update that implements all that malloc_size_of.

Current downside:
The generated fog_metric_alloc_size is the 30th largest function in an
optimized build.
It's some 3000 lines long, because it has to call size_of on each and
every metric (majority of them use counters).
This will only grow with the number of metrics we add. I don't have a
solution for that yet.

Depends on D210288

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/fc4228c45495
FOG: Report memory size of all (instantiated) metrics r=chutten

Comment 3

[Sandor Molnar[:smolnar]]

https://hg.mozilla.org/mozilla-central/rev/fc4228c45495