It'd be nice to allow a process to send RT requests without granting it the wide capabilities of CAP_SYS_ADMIN, and we already have a capability which seems to almost fit this priority idea - CAP_SYS_NICE? Would this fit there? Being capable of setting IO priorities on per request or per thread basis (be it async submission or w/ thread ioprio_set) is useful especially when the userspace has its own prioritization/scheduling before hitting the kernel, allowing us to signal to the kernel how to order certain IOs, and it'd be nice to separate this from ADMIN for non-root processes, in a way that's less error prone than e.g. having a trusted launcher ionice the process and then drop priorities for everything but prio requests. khazhy
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