846690 - hyphenation manager should discard loaded dictionaries on memory-pressure notification

Status: RESOLVED FIXED

(Core :: Internationalization, defect)

Description

[Jonathan Kew [:jfkthame]]

We load the hyphenation resources on first use, but then we keep them in memory so that we won't kill performance by having to do the (expensive) dictionary-loading operation for every line-break.

However, if we're really low on memory, we should discard the dictionaries (which may potentially occupy quite a few megabytes, if hyphenation has been attempted for several languages with large dictionaries).

Comment 1

[Jonathan Kew [:jfkthame]]

Attachment: add a memory-pressure notification observer to the hyphenation manager, to discard dictionaries when we're low on memory.

Comment 2

[Jonathan Kew [:jfkthame]]

https://hg.mozilla.org/integration/mozilla-inbound/rev/5040d4861a8d

Comment 3

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/5040d4861a8d