On Mon, Apr 25, 2022 at 02:09:06PM +0200, Christoph Lameter wrote: > On Mon, 25 Apr 2022, Aaron Tomlin wrote: > > > Yes, in the context of nohz, this patch should ensure it, if required, when > > the idle tick is to be stopped. > > What I said was that it is generally useful. Even in the non NOHZ case. > > Folding the vmstat diffs *always* when entering idle prevents unnecessary > wakeups and processing in the future and also provides more accurate > counters for the VM allowing better decision to be made on reclaim. I'm thinking you're going to find a ton of regressions if you try it though; some workloads go idle *very* shortly, doing all this accounting is going to be counter-productive.
