fix: avoid integer overflow when computing percentage for large sample counts#367
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SAY-5 wants to merge 4 commits into
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fix: avoid integer overflow when computing percentage for large sample counts#367SAY-5 wants to merge 4 commits into
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jonhoo
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Jul 5, 2026
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Nice, thanks! Would you mind also adding an entry to CHANGELOG.md?
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Added a CHANGELOG entry under Unreleased > Fixed. |
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Fixes #170.
When a stack has a very large sample count (e.g.
offwaketimeoutput with values around 2.4e17),100 * samplesoverflowed the integer type and panicked with "attempt to multiply with overflow" atsrc/flamegraph/mod.rs. The same applied to100 * deltain the differential path.Performing the
* 100in floating point (100.0 * x as f64) avoids the overflow. Output is unchanged for normal-magnitude inputs.Added a regression test that feeds large sample counts through
from_linesand asserts it does not panic.