Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work

[Michal Hocko]

On Sat 28-03-15 10:53:22, Peter Zijlstra wrote:
[...]
> Alternatively the thing hocko suggests is an utter fail too. You cannot
> stuff that into hardirq context, that's insane.

I guess you are referring to
http://article.gmane.org/gmane.linux.kernel.mm/127569, right?

Why cannot we do something like refresh_cpu_vm_stats from the IRQ
context?  Especially the first zone stat part. The per-cpu pagesets is
more costly and it would need a special treatment, alright. A simple
way would be to splice the lists from the per-cpu context and then free
those pages from the kthread context.

I am still wondering why those two things were squashed into a single
place. Why kswapd is not doing the pcp cleanup?
-- 
Michal Hocko
SUSE Labs
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