On Mon, Apr 26, 2021 at 06:40:56PM +0000, Hongtao Yu wrote: > Andi, thanks for pointing out the perf script issues. Can you please > elaborate a bit on the exact issue you have seen? We’ve been using > specific output of perf script such as mmap, LBR and callstack events > filtered by process id. It works fine so far but may certainly hit issues > in the future with extended uses.
Okay I took a look at the latest autofdo now. It seems to be basically a LLVM project now that depends on LLVM to even build with all kinds of dependency hell on some old LLVM version and other packages. I guess gcc will really need a replacement that doesn't pull in all of LLVM if it wants to continue supporting autofdo. I'm myself unable to build now. I'm using the old version I had a git fork of and that was before all of this. I added a patch to make it work with the latest perf by ignoring increased perf_attr and unknown perf events. Honza please use https://github.com/andikleen/autofdo -b perf-future for testing. -Andi
