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The main thread is the busiest, so it benefits the most from having its own chunked buffer. This removes one allocation when capturing a marker stack on the main thread of each process. That buffer is allocated when the first profiler starts, and is destroyed when the last profiler stops. Note: Further improvements are possible (e.g.: Pool of pre-allocated buffers, attempting to use a stack-based buffer, etc.), but they are more complex and will require more work in future bugs. Differential Revision: https://phabricator.services.mozilla.com/D133725