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Diffstat (limited to 'instrumentation/README.llvm.md')
| -rw-r--r-- | instrumentation/README.llvm.md | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/instrumentation/README.llvm.md b/instrumentation/README.llvm.md index cfe537d5..8ce5afb9 100644 --- a/instrumentation/README.llvm.md +++ b/instrumentation/README.llvm.md @@ -144,6 +144,11 @@ is not optimal and was only fixed in llvm 9. You can set this with AFL_LLVM_NOT_ZERO=1 See [README.neverzero.md](README.neverzero.md) +Support for thread safe counters has been added for all modes. +Activate it with `AFL_LLVM_THREADSAFE_INST=1`. The tradeoff is better precision +in multi threaded apps for a slightly higher instrumentation overhead. +This also disables the nozero counter default for performance reasons. + ## 4) Snapshot feature To speed up fuzzing you can use a linux loadable kernel module which enables |