[$] Memory-allocation profiling for the kernel

Optimizing the kernel's memory use is made much easier if developers havean accurate idea of how memory is being used, but the kernel'sinstrumentation is not as good as it could be. When Suren Baghdasaryan andKent Overstreet presented theirmemory-allocation profiling work, which is meant to address thisshortcoming, at the 2023 Linux Storage, Filesystem, Memory Management, andBPF Summit, their objective was uncontroversial but the proposed solutionran into opposition that played out at length on the mailing lists (example)over the last year. So it may be a bit surprising that, when the tworeturned to the memory-management track in the 2024 gathering, thecontroversy was gone and the discussion focused on improving details of theimplementation.