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

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:

quoted

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