Re: [RFC PATCH 0/4] Enable Clang's Source-based Code Coverage and MC/DC for x86-64
Sasha Levin <[email protected]>
| Newsgroups | org.infradead.lists.linux-um,dev.linux.lists.llvm,org.kernel.vger.linux-arch,org.kernel.vger.linux-efi,org.kernel.vger.linux-kbuild,org.kernel.vger.linux-kernel,org.kernel.vger.linux-trace-kernel |
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| Message-ID | <aba_HgSbzLGm6VBQ@laps> |
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