Hello, Quentin. On Fri, Jun 14, 2019 at 12:32:09PM +0100, Quentin Monnet wrote: > Please make sure to update the documentation and bash > completion when adding the new type to bpftool. You > probably want something like the diff below. Thank you so much. Will incorporate them. Just in case, while it's noted in the head message, I lost the RFC marker while prepping this patch. It isn't yet clear whether we'd really need custom cost functions and this patch is included more as a proof of concept. If it turns out that this is beneficial enough, the followings need to be answered. * Is block ioctl the right mechanism to attach these programs? * Are there more parameters that need to be exposed to the programs? * It'd be great to have efficient access to per-blockdev and per-blockdev-cgroup-pair storages available to these programs so that they can keep track of history. What'd be the best of way of doing that considering the fact that these programs will be called per each IO and the overhead can add up quickly? Thanks. -- tejun
