908398 - Add performance warning for use of nsITraceableChannel

Status: NEW

(Core :: Networking, defect, P5)

Description

[Steve Workman [:sworkman] (INACTIVE)]

When nsITraceableChannel is used to insert JS-based nsIStreamListener's, off main thread delivery of OnDataAvailable is disabled. This is a potential performance consideration, and as such, users of nsITraceableChannel should be warned.

This bug tracks the following:

-- Adding a warning comment in nsITraceableChannel.idl.
-- Add a warning to the console when nsITraceableChannel is used and disables off main thread delivery of OnDataAvailable.
-- Add warnings to nsITraceableChannel documentation on the web, e.g.
   -> https://developer.mozilla.org/en-US/docs/XPCOM_Interface_Reference/NsITraceableChannel,
   -> http://www.softwareishard.com/blog/firebug/nsitraceablechannel-intercept-http-traffic/

Note: Firebug is a popular user of this IDL, most notably for the Net panel. Since this is used for debugging mostly, and doesn't affect regular performance, console warnings can be disabled for Firebug.

Comment 1

[Firefox Bug Husbandry Bot]

Bulk change to priority: https://bugzilla.mozilla.org/show_bug.cgi?id=1399258