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authorDavid Teller <dteller@mozilla.com>2019-01-28 23:41:20 +0100
committerwolfbeast <mcwerewolf@wolfbeast.com>2019-01-28 23:41:20 +0100
commit3476c1d60ec29c5497123194acd7a9310b1023d2 (patch)
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Reduce number of allocations in AutoStopwatch
This patch fixes two related issues. 1. The AutoStopwatch uses a stack-allocated `mozilla::Vector` to communicate with its callback during each compartment switch. This vector was designed to allow its contents to be stack-allocated but they turned out to be accidentally heap-allocated. 2. During each tick, the stopwatch fills a vector `recentGroups_`. This vector always started with minimal capacity and had to grow repeatedly as groups were added, causing repeated reallocations. This patch preallocates `recentGroups_` to have the same capacity as the previous tick. We expect that this should eventually reach a stable size that closely matches the actual needs of the process.
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