[PATCH] sched/nohz: add debugfs control over sched_tick_max_deferment

Frederic Weisbecker [off-list ref] writes:

On Fri, Sep 26, 2014 at 12:45:32PM -0700, Kevin Hilman wrote:

quoted

From: Kevin Hilman <redacted>

Allow debugfs 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 <redacted>
Signed-off-by: Kevin Hilman <redacted>

So, I'm worried that it becomes a hack that everybody uses to shutdown
the tick completely then nobody will come and fix the issue that prevents
from doing it properly.

OK.

I seriously doubt this will be used for development purpose to help
fixing the real problem. 

Well, that's what I was using it for, until I was distracted by other
tasks.

Quite the opposite. If developers want to do
testing, they can as well comment out the call to scheduler_max_tick_deferment().

OK, fair enough.

Thanks,

Kevin