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Reduce number of allocations in AutoStopwatch

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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.
This commit is contained in:
David Teller 2019-01-29 03:11:39 +01:00 • committed by Roy Tam
commit 7d0bef1093
4 changed files with 31 additions and 9 deletions
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2
js/src/jsapi.h
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@ -6566,7 +6566,7 @@ struct JS_PUBLIC_API(PerformanceGroup) {
uint64_t refCount_;
};
using PerformanceGroupVector = mozilla::Vector<RefPtr<js::PerformanceGroup>, 0, SystemAllocPolicy>;
using PerformanceGroupVector = mozilla::Vector<RefPtr<js::PerformanceGroup>, 8, SystemAllocPolicy>;
/**
* Commit any Performance Monitoring data.