Hi, here is a patch documenting that ionice -c3 runs for normal users on >= 2.6.25 kernels.
Regards, Bastian Kleineidam
--- /home/calvin/ionice.1 2008-05-28 14:24:49.217147000 +0200 +++ ionice.1 2008-05-28 14:24:29.661149056 +0200 @@ -14,7 +14,8 @@ program has asked for disk io for a defined grace period. The impact of idle io processes on normal system activity should be zero. This scheduling class does not take a priority argument. This scheduling class is not -permitted for an ordinary (i.e., non-root) user. +permitted for an ordinary (i.e., non-root) user when running on kernels +version 2.6.24 or earlier. \fBBest effort\fR. This is the default scheduling class for any process that hasn't asked for
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