Re: [RFC PATCH 0/4] Enable Clang's Source-based Code Coverage and MC/DC for x86-64

Sasha Levin
2026-03-15T14:15:59Z

On Wed, Oct 15, 2025 at 11:21:45AM +0200, Peter Zijlstra wrote:
>On Wed, Oct 15, 2025 at 08:26:50AM +0000, Chuck Wolber wrote:
>> Optimization makes it nearly impossible to correlate GCov results back to
>> actual lines of source. llvm-cov instruments at the AST level which enables
>> precise mapping back to source code regardless of optimization level.
>>
>>
>> A detailed rundown on this issue can be found here[1], with the most relevant
>> excerpt reproduced here:
>
>Yes read and understand this, but that doesn't mean you have to have 3
>different kernel interfaces for all of this, right?

To clarify, are you suggesting that we'll have something like a single
/sys/kernel/debug/coverage interface that is producing the same structured
output whether we use gcov or llvm?

--
Thanks,
Sasha