1300852 - Show total row in memory usage of subprocess table

Status: RESOLVED WONTFIX

(Toolkit :: Performance Monitoring, defect)

Description

[Mike Conley (:mconley) (:⚙️)]

+++ This bug was initially created as a clone of Bug #1300850 +++

With dom.ipc.processCount > 1, and several tabs open, visit about:performance. Notice the table showing the memory usage of each content process and the parent process. This table was added in bug 1255843.

We should probably show a total memory usage for each of the columns, probably pinned as a footer to the bottom of the table.

Comment 1

[Nicholas Nethercote [inactive]]

Summing the USS measurements is reasonable.

Summing the RSS measurements is very iffy, because they can overlap. Code and static data can be shared between processes, in which case the shared stuff will be included in multiple RSS measurements.

Comment 2

[Florian Quèze [:florian]]

about:performance is being redesigned; mass closing the bugs related to parts of the current about:performance page that we are not keeping.

Our goals with the redesign are to reduce the overhead caused by having the page opened, increase the reliability of the displayed information, and make the offered information actionable for most users. The back-end work is being tracked in bug 1419681.