linux-kernel - Re: Page migration issue with UBIFS

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Message-ID: <56EA672A.7070007@nod.at>
Date:	Thu, 17 Mar 2016 09:13:30 +0100
From:	Richard Weinberger <richard@....at>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:	"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
Subject: Re: Page migration issue with UBIFS

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?

Thanks,
//richard