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Re: Page migration issue with UBIFS

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2016-03-17 17:13 GMT+09:00 Richard Weinberger <richard@nod.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.

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Thread

Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-15 15:20 +0100
  Re: Page migration issue with UBIFS "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-03-15 16:20 +0100
    Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-15 16:30 +0100
      Re: Page migration issue with UBIFS Christoph Hellwig <hch@infradead.org> - 2016-03-15 16:40 +0100
      Re: Page migration issue with UBIFS "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-03-15 16:50 +0100
    Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-15 16:40 +0100
      Re: Page migration issue with UBIFS Christoph Hellwig <hch@infradead.org> - 2016-03-15 16:40 +0100
        Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-15 17:10 +0100
        Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-16 00:20 +0100
          Re: Page migration issue with UBIFS "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> - 2016-03-16 15:30 +0100
            Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-16 21:50 +0100
              [PATCH] UBIFS: Implement ->migratepage() Richard Weinberger <richard@nod.at> - 2016-03-17 00:00 +0100
                Re: [PATCH] UBIFS: Implement ->migratepage() Vlastimil Babka <vbabka@suse.cz> - 2016-03-17 11:00 +0100
                Re: [PATCH] UBIFS: Implement ->migratepage() Richard Weinberger <richard@nod.at> - 2016-03-26 00:00 +0100
              Re: Page migration issue with UBIFS Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2016-03-17 08:20 +0100
                Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-17 09:20 +0100
                Re: Page migration issue with UBIFS Joonsoo Kim <js1304@gmail.com> - 2016-03-17 16:20 +0100
              Re: Page migration issue with UBIFS Andrew Morton <akpm@linux-foundation.org> - 2016-03-22 00:10 +0100
                Re: Page migration issue with UBIFS Richard Weinberger <richard@nod.at> - 2016-03-22 00:10 +0100
          Re: Page migration issue with UBIFS "Kirill A. Shutemov" <kirill@shutemov.name> - 2016-03-16 15:30 +0100
            Re: Page migration issue with UBIFS Christoph Hellwig <hch@infradead.org> - 2016-03-21 16:30 +0100
  Re: Page migration issue with UBIFS Boris Brezillon <boris.brezillon@free-electrons.com> - 2016-03-17 16:30 +0100

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