A short history of btrfs

So, you're going to arrange some way of recording average %sy time as a single number (there are lots of different ways of doing this), then somehow graph it that makes sense to regular people?

Just timing a file decompression is a lot easier for all involved, no? It's not a great benchmark, true, but it will quickly and reliably tell you if one FS requires more CPU than another. And that's the most important thing.