Re: [patch for-5.3 0/4] revert immediate fallback to remote hugepages
From: Michal Hocko
Date: Mon Sep 09 2019 - 04:37:53 EST
On Sun 08-09-19 13:45:13, David Rientjes wrote:
> If the reverts to 5.3 are not
> applied, then I'm not at all confident that forward progress on this issue
> will be made:
David, could you stop this finally? I think there is a good consensus
that the current (even after reverts) behavior is not going all the way
down where we want to get. There have been different ways forward
suggested to not fallback to remote nodes too easily, not to mention
a specialized memory policy to explicitly request the behavior you
presumably need (and as a bonus it wouldn't be THP specific which is
You seem to be deadlocked in "we've used to do something for 4 years
so we must preserve that behavior". All that based on a single and
odd workload which you are hand waving about without anything for
the rest of the community to reproduce. Please try to get out of the
argumentation loop. We are more likely to make a forward progress.
5.3 managed to fix the worst case behavior, now let's talk about more
clever tuning. You cannot expect such a tuning is an overnight work.
This area is full of subtle side effects and few liners might have hard
to predict consequences.