All of lore.kernel.org
 help / color / mirror / Atom feed
From: Richard Weinberger <richard@nod.at>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Christoph Hellwig <hch@infradead.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Boris Brezillon <boris.brezillon@free-electrons.com>,
	Maxime Ripard <maxime.ripard@free-electrons.com>,
	David Gstir <david@sigma-star.at>,
	Dave Chinner <david@fromorbit.com>,
	Artem Bityutskiy <dedekind1@gmail.com>,
	Alexander Kaplan <alex@nextthing.co>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	Sasha Levin <sasha.levin@oracle.com>,
	rvaswani@codeaurora.org, "Luck, Tony" <tony.luck@intel.com>,
	Shailendra Verma <shailendra.capricorn@gmail.com>,
	s.strogin@partner.samsung.com
Subject: Re: Page migration issue with UBIFS
Date: Thu, 17 Mar 2016 09:13:30 +0100	[thread overview]
Message-ID: <56EA672A.7070007@nod.at> (raw)
In-Reply-To: <20160317071155.GB10315@js1304-P5Q-DELUXE>

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

WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard@nod.at>
To: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
	"Kirill A. Shutemov" <kirill@shutemov.name>,
	Christoph Hellwig <hch@infradead.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	"linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Boris Brezillon <boris.brezillon@free-electrons.com>,
	Maxime Ripard <maxime.ripard@free-electrons.com>,
	David Gstir <david@sigma-star.at>,
	Dave Chinner <david@fromorbit.com>,
	Artem Bityutskiy <dedekind1@gmail.com>,
	Alexander Kaplan <alex@nextthing.co>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	Sasha Levin <sasha.levin@oracle.com>,
	rvaswani@codeaurora.org, "Luck, Tony" <tony.luck@intel.com>,
	Shailendra Verma <shailendra.capricorn@gmail.com>,
	s.strogin@partner.samsung.com
Subject: Re: Page migration issue with UBIFS
Date: Thu, 17 Mar 2016 09:13:30 +0100	[thread overview]
Message-ID: <56EA672A.7070007@nod.at> (raw)
In-Reply-To: <20160317071155.GB10315@js1304-P5Q-DELUXE>

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

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  reply	other threads:[~2016-03-17  8:13 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-15 14:16 Page migration issue with UBIFS Richard Weinberger
2016-03-15 14:16 ` Richard Weinberger
2016-03-15 15:17 ` Kirill A. Shutemov
2016-03-15 15:17   ` Kirill A. Shutemov
2016-03-15 15:25   ` Richard Weinberger
2016-03-15 15:25     ` Richard Weinberger
2016-03-15 15:35     ` Christoph Hellwig
2016-03-15 15:35       ` Christoph Hellwig
2016-03-15 15:47     ` Kirill A. Shutemov
2016-03-15 15:47       ` Kirill A. Shutemov
2016-03-15 15:32   ` Richard Weinberger
2016-03-15 15:32     ` Richard Weinberger
2016-03-15 15:37     ` Christoph Hellwig
2016-03-15 15:37       ` Christoph Hellwig
2016-03-15 16:02       ` Richard Weinberger
2016-03-15 16:02         ` Richard Weinberger
2016-03-15 23:18       ` Richard Weinberger
2016-03-15 23:18         ` Richard Weinberger
2016-03-16 14:21         ` Kirill A. Shutemov
2016-03-16 14:21           ` Kirill A. Shutemov
2016-03-16 14:27           ` Kirill A. Shutemov
2016-03-16 14:27             ` Kirill A. Shutemov
2016-03-16 20:47             ` Richard Weinberger
2016-03-16 20:47               ` Richard Weinberger
2016-03-16 22:55               ` [PATCH] UBIFS: Implement ->migratepage() Richard Weinberger
2016-03-16 22:55                 ` Richard Weinberger
2016-03-16 23:12                 ` kbuild test robot
2016-03-16 23:12                   ` kbuild test robot
2016-03-17  4:39                 ` kbuild test robot
2016-03-17  4:39                   ` kbuild test robot
2016-03-17  8:09                   ` Richard Weinberger
2016-03-17  8:09                     ` Richard Weinberger
2016-03-17  9:57                 ` Vlastimil Babka
2016-03-17  9:57                   ` Vlastimil Babka
2016-03-25 22:53                   ` Richard Weinberger
2016-03-25 22:53                     ` Richard Weinberger
2016-03-17  7:11               ` Page migration issue with UBIFS Joonsoo Kim
2016-03-17  7:11                 ` Joonsoo Kim
2016-03-17  8:13                 ` Richard Weinberger [this message]
2016-03-17  8:13                   ` Richard Weinberger
2016-03-17 15:17                   ` Joonsoo Kim
2016-03-17 15:17                     ` Joonsoo Kim
2016-03-21 23:00               ` Andrew Morton
2016-03-21 23:00                 ` Andrew Morton
2016-03-21 23:06                 ` Richard Weinberger
2016-03-21 23:06                   ` Richard Weinberger
2016-03-21 15:28           ` Christoph Hellwig
2016-03-21 15:28             ` Christoph Hellwig
2016-03-17 15:25 ` Boris Brezillon
2016-03-17 15:25   ` Boris Brezillon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=56EA672A.7070007@nod.at \
    --to=richard@nod.at \
    --cc=akpm@linux-foundation.org \
    --cc=alex@nextthing.co \
    --cc=boris.brezillon@free-electrons.com \
    --cc=david@fromorbit.com \
    --cc=david@sigma-star.at \
    --cc=dedekind1@gmail.com \
    --cc=hch@infradead.org \
    --cc=iamjoonsoo.kim@lge.com \
    --cc=kirill.shutemov@linux.intel.com \
    --cc=kirill@shutemov.name \
    --cc=linux-fsdevel@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=maxime.ripard@free-electrons.com \
    --cc=rvaswani@codeaurora.org \
    --cc=s.strogin@partner.samsung.com \
    --cc=sasha.levin@oracle.com \
    --cc=shailendra.capricorn@gmail.com \
    --cc=tony.luck@intel.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.