QA/Automation/Projects/Addons/MemChaser/Future Features

Circular Buffer

Usage/Overview

• Main data structure for graphs
• Stores temporary GC (and CC,etc.) values
• Conceptually is a linked list with a cycle from the tail to head, but it would be implemented using an array in JavaScript

Requirements

• Have as little impact on garbage collection as possible
• Have read/write capabilities with events emitted from writes
• Read operations should not post-increment head index and should not delete the element being read

Current Proposal

Source

https://github.com/dglol/memchaser/blob/circular-buffer/extension/lib/circular-buffer.js

Methods

read([index])

• • reads from (head + index) if index is given
  • else it reads the head value (i.e. index = 0)

Potential issues

JSON Blob vs Separate Buffers

• A JSON Blob of all the data ({gc: , cc:, etc}) has less overhead but writes would have to be synchronous
• GC and related data occur at different times, so separate buffers allows asynchronous writing

Memory Report per Compartment

Blocked by https://bugzilla.mozilla.org/show_bug.cgi?id=687724