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The profiler can be given any power of two, but there were no safety checks to ensure that the buffer had a minimum workable capacity (to hold at least 4 chunks, each capable of holding at least one stack sample), and also to prevent large buffers that could break the currently-supported 2GiB limit. This fixes the issue with test_merged_stacks.js, which was requesting a too-small buffer. (This started when we switched to the chunk-based buffer, because the profiler was blindly using the provided number as maximum, and dividing that size by 4 for each chunk, which was not enough to hold a full sample in some builds.) Differential Revision: https://phabricator.services.mozilla.com/D73212 |
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