Re: [RFC] autonuma: Support to scan page table asynchronously

[Peter Zijlstra]

On Thu, Apr 16, 2020 at 09:24:35AM +0800, Huang, Ying wrote:
> Peter Zijlstra <peterz@xxxxxxxxxxxxx> writes:
> 
> > On Tue, Apr 14, 2020 at 01:06:46PM +0100, Mel Gorman wrote:
> >> While it's just an opinion, my preference would be to focus on reducing
> >> the cost and amount of scanning done -- particularly for threads.
> >
> > This; I really don't believe in those back-charging things, esp. since
> > not having cgroups or having multiple applications in a single cgroup is
> > a valid setup.
> 
> Technically, it appears possible to back-charge the CPU time to the
> process/thread directly (not the cgroup).

I've yet to see a sane proposal there. What we're not going to do is
make regular task accounting more expensive than it already is.