linux-kernel - Re: Page migration issue with UBIFS

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Message-ID: <CAAmzW4M2uLE0VJ91BfveNR4_crsaUEPpLB6HW393jhpF4=G73Q@mail.gmail.com>
Date:	Fri, 18 Mar 2016 00:17:18 +0900
From:	Joonsoo Kim <js1304@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Christoph Hellwig <hch@...radead.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	David Gstir <david@...ma-star.at>,
	Dave Chinner <david@...morbit.com>,
	Artem Bityutskiy <dedekind1@...il.com>,
	Alexander Kaplan <alex@...tthing.co>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Sasha Levin <sasha.levin@...cle.com>, rvaswani@...eaurora.org,
	"Luck, Tony" <tony.luck@...el.com>,
	Shailendra Verma <shailendra.capricorn@...il.com>,
	s.strogin@...tner.samsung.com, Hugh Dickins <hughd@...gle.com>,
	Mel Gorman <mgorman@...hsingularity.net>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: Re: Page migration issue with UBIFS

2016-03-17 17:13 GMT+09:00 Richard Weinberger <richard@....at>:
> Am 17.03.2016 um 08:11 schrieb Joonsoo Kim:
>>> 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?

Vlastimil already added Hugh and Mel to other relevant thread but I think
this thread has more information about the problem so I add them here.

Thanks.