Kernel topics on the radar

So for task isolation with version 2 of the patch set, if I want to remove as much OS noise as possible, I would do the following on a nohz CPU:

assert( (prctl(PR_ISOL_FEAT, 0, 0, 0, 0) & ISOL_F_QUIESCE) != 0);
int max_silence = prctl(PR_ISOL_FEAT, ISOL_F_QUIESCE, 0, 0, 0);
assert( prctl(PR_ISOL_SET, ISOL_F_QUIESCE, max_silence, 0, 0) >= 0);
assert( prctl(PR_ISOL_CTRL_SET, ISOL_F_QUIESCE, 0, 0, 0) >= 0);

Correct? (Assuming I'm not afraid of regressions..what regressions?)