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It's other way around. I proposed PERF_MEM_LVLNUM_EXTN_MEM but it was vague and thus we replaced it with PERF_MEM_LVLNUM_CXL. So tool side file is correct and kernel header needs to be fixed: https://lore.kernel.org/lkml/f6268268-b4e9-9ed6-0453-65792644d953@amd.com Thanks, Ravi