Re: [PATCH 1/2] sched/nohz: add sysctl control oversched_tick_max_deferment

From: Frederic Weisbecker
Date: Wed Jun 19 2013 - 14:42:52 EST

On Tue, Jun 18, 2013 at 04:58:28PM -0700, Kevin Hilman wrote:
> Allow sysctl override of sched_tick_max_deferment in order to ease
> finding/fixing the remaining issues with full nohz.
> The value to be written is in jiffies, and -1 means the max deferment
> is disabled (scheduler_tick_max_deferment() returns KTIME_MAX.)
> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxx>

This looks like a useful thing but I wonder if a debugfs file would
be more appropriate than sysctl.

The scheduler tick max deferment is supposed to be a temporary
hack so we probably don't want to bring a real user ABI for that.

I believe sysctl is for permanent ABIs, right?
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