In OCFS2 there is currently an in-kernel heartbeat thread that really wants to communicate liveness to other nodes as quickly as possible by writing to a block device. Setting aside the specific wisdom of a kernel heartbeat thread for a bit, has it been considered that kernel threads might want to set their io priority with the task->ioprio bits? Neither set_task_ioprio() nor sys_ioprio_set() seem to be accessible to modules and open-coding it is clearly a bad idea. Would the universe be opposed to a _GPL() export of, say, the sys_() interface?
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