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Commit a17664d829 ("MEDIUM: tasks: automatically requeue into the bulk
queue an already running tasklet") tried to inflict a penalty to
self-requeuing tasks/tasklets which correspond to those involved in
large, high-latency data transfers, for the benefit of all other
processing which requires a low latency. However, it turns out that
while it ought to do this on a case-by-case basis, basing itself on
the RUNNING flag isn't accurate because this flag doesn't leave for
tasklets, so we'd rather need a distinct flag to tag such tasklets.
This commit introduces TASK_SELF_WAKING to mark tasklets acting like
this. For now it's still set when TASK_RUNNING is present but this
will have to change. The flag is kept across wakeups.