985040 - Purge weak/dead things in the child-process-manager on memory pressure

Status: NEW

(Core :: IPC, defect)

Description

[Andrew McCreight [:mccr8]]

In bug 981871, bkelly noticed this in the about:memory log:

2,321 (100.0%) -- message-manager
└──2,321 (100.0%) -- referent
   ├──2,175 (93.71%) -- child-process-manager
   │  ├──1,440 (62.04%) ── weak/dead
   │  └────735 (31.67%) ── strong
   └────146 (06.29%) ── global-manager/weak/dead

That seems not ideal, so maybe we could do something hacky like purge the list on memory pressure?  I don't know exactly how that works.  (Also I don't know what the right component for the MM is.)

Comment 1

[Andrew McCreight [:mccr8]]

I think (and hope) that this will only result in a big array of weak pointers not pointing to anything.  If they are keeping anything alive, this is a bigger problem.