Re: [PATCH tip/core/timers 2/4] timers: Reduce __run_timers()latency for empty list

[Peter Zijlstra]

On Wed, Jan 15, 2014 at 06:03:10PM +0100, Oleg Nesterov wrote:
> On 01/14, Paul E. McKenney wrote:
> >
> > The __run_timers() function currently steps through the list one jiffy at
> > a time
> 
> And this is very suboptimal if jiffies - timer_jiffies is huge. Looks
> like, we should rework base->tv* structures, or (perhaps) optimize
> the "cascade" logic so that __run_timers() can increment timer_jiffies
> and move all the expired timers into work_list at one step. And the
> ->next_timer logic is obviously very suboptimal.

Thomas is actually actively working on a replacement for the entire
cascade mess.
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