rb_provide_feature: Prevent $LOADED_FEATURES from being copied #5593
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[Bug #18599] `vm->loaded_features` and `vm->loaded_features_snapshot` both share the same root. When a feature is pushed into `loaded_features`, the sharing is broken and `loaded_features` is copied. So an application requiring 1000 files, will allocate 1000 arrays of increasing size, which is very wasteful. To avoid this, we first clear the snapshot, so that `loaded_features` can directly be pushed into. Co-Authored-By: Peter Zhu <peter.zhu@shopify.com>
tenderlove
approved these changes
Feb 23, 2022
Merged
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[Bug #18599]
vm->loaded_featuresandvm->loaded_features_snapshotboth share thesame root. When a feature is pushed into
loaded_features, the sharingis broken and
loaded_featuresis copied.So an application requiring 1000 files, will allocate 1000 arrays of
increasing size, which is very wasteful.
To avoid this, we first clear the snapshot, so that
loaded_featurescan directly be pushed into.
Co-Authored-By: @peterzhu2118