On Thu, Mar 03, 2011 at 05:32:28PM +0100, Arnd Bergmann wrote: > On Thursday 03 March 2011, Kirill A. Shutsemov wrote: > > task_get_effective_timer_slack() returns timer slack value to be used > > to configure per-task timers. It can be equal or higher than task's > > timer slack value. > > > > For now task_get_effective_timer_slack() returns timer_slack_ns of the > > task. Timer slack cgroup controller will implement a bit more > > sophisticated logic. > > Some time ago, there was a discussion about a method for automatically > determining timer slack values, and I think nobody ever implemented it. > > The idea was to penalize tasks that have timers expiring a lot, typically > a sign of programs that were not written with power consumption in mind. > > I think that could be nicely combined with your patch. Instead of setting > the effective timer slack for the entire control group, you could > set a target value that is applied only to tasks that have their timers > expire frequently. When a timer expires for a task, you increase the > effective slack up to the maximum, and when you set up a timer, you > decrease it again. The amount by which the effective slack gets changed > can depend on how long ago the last timer expired. > > Does this make sense to you? Hm.. I think we can add this kind of functionality to timer slack cgroup as a policy/stratagy later. I want to integrate basic functionality to kernel first. -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
