Re: [PATCH 1/2] mm: thp: relax __GFP_THISNODE for MADV_HUGEPAGE mappings

From: Andrea Arcangeli
Date: Mon Oct 29 2018 - 06:56:05 EST


On Mon, Oct 29, 2018 at 11:08:34AM +0100, Michal Hocko wrote:
> This seems like a separate issue which should better be debugged. Please
> open a new thread describing the problem and the state of the node.

Yes, in my view it should be evaluated separately too, because it's
overall less concerning: __GFP_THISNODE there can only be set by the
root user there. So it has a chance to be legitimate behavior
there. Let's focus on solving the __GFP_THISNODE that any user in the
system can set (not only root) and cause severe and unexpected swap
storms or slowdowns to all other processes run by other users.

ls -l /sys/kernel/mm/hugepages/*/nr_hugepages

(and boot command line)