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

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@gmail.com Signed-off-by: Kevin Hilman khilman@linaro.org

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?