Am 17.03.2016 um 08:11 schrieb Joonsoo Kim:

quoted

It is still not clear why UBIFS has to provide a >migratepage() and what the expected semantics
are.
What we know so far is that the fall back migration function is broken. I'm sure not only on UBIFS.

Can CMA folks please clarify? :-)

Hello,

As you mentioned earlier, this issue would not be directly related
to CMA. It looks like it is more general issue related to interaction
between MM and FS. Your first error log shows that error happens when
ubifs_set_page_dirty() is called in try_to_unmap_one() which also
can be called by reclaimer (kswapd or direct reclaim). Quick search shows
that problem also happens on reclaim. Is that fixed?

http://www.spinics.net/lists/linux-fsdevel/msg79531.html

Well, this problem happened only on a tainted kernel and never popped up again.
So, I really don't know. :-)

I think that you need to CC other people who understand interaction
between MM and FS perfectly.

Who is missing on the CC list?

Thanks,
//richard

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