On Mon 2022-04-25 09:23 +0200, Christoph Lameter wrote: > On Fri, 22 Apr 2022, Aaron Tomlin wrote: > > > A customer provided some evidence which indicates that the idle tick was > > stopped; albeit, CPU-specific vmstat counters still remained populated. > > Thus one can only assume quiet_vmstat() was not invoked on return to the > > idle loop. > > Could we *always* fold the vmstat counters when entering idle mode? That > would make the logic less complicated. There is nothing else to do since > we are entering an idle state and if there are any counter deltas then we > have the time to process them. This may also decrease the time that > deltas exist significantly and an idle system will have accurate vmstat > counters. Hi Christoph, Thank you for your feedback. Yes, in the context of nohz, this patch should ensure it, if required, when the idle tick is to be stopped. Kind regards, -- Aaron Tomlin
