On 2019-07-10 11:21:19 [-0700], Yang Shi wrote:
>
> compaction should not isolate unevictable pages unless you have
> /proc/sys/vm/compact_unevictable_allowed set.
Thank you. This is enabled by default. The documentation for this says
| … compaction is allowed to examine the unevictable lru (mlocked pages) for
| pages to compact.…
so it is actually clear once you know where to look.
If I read this correct, the default behavior was to ignore mlock()ed
pages for compaction then commit
5bbe3547aa3ba ("mm: allow compaction of unevictable pages")
came along in v4.1-rc1 and changed that behaviour. Is it too late to
flip it back?
Sebastian
