> The original question (unless I'm missing something) was "why _the owner_
> of a process is not enabled to lower its IO priority?" The owner of the
> process certainly can send signal and ptrace it.
Ah I misparsed you.
Sending signals and ptraces is atomic regarding system operations. This means
the kernel will finish doing whatever it is doing (or bail out releasing
all resources) before processing them. So stopping a process this
way can never starve its IO. Ok there are special cases like user space
FUSE or NFS servers that can block operations, but these are expected to run
as root.
-Andi
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