lkml.org 
[lkml]   [2016]   [Mar]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Page migration issue with UBIFS
On Tue, Mar 15, 2016 at 04:25:50PM +0100, Richard Weinberger wrote:
> Kirill,
>
> Am 15.03.2016 um 16:17 schrieb Kirill A. Shutemov:
> > On Tue, Mar 15, 2016 at 03:16:11PM +0100, Richard Weinberger wrote:
> >> Hi!
> >>
> >> We're facing this issue from 2014 on UBIFS:
> >> http://www.spinics.net/lists/linux-fsdevel/msg79941.html
> >>
> >> So sum up:
> >> UBIFS does not allow pages directly marked as dirty. It want's everyone to do it via UBIFS's
> >> ->wirte_end() and ->page_mkwirte() functions.
> >> This assumption *seems* to be violated by CMA which migrates pages.
> >
> > I don't thing the CMA/migration is the root cause.
> >
> > How did we end up with writable and dirty pte, but not having
> > ->page_mkwrite() called for the page?
> >
> > Or if ->page_mkwrite() was called, why the page is not dirty?
>
> Thanks for your quick response!
>
> I also don't think that the root cause is CMA or migration but it seems
> to be the messenger.
>
> Can you confirm that UBIFS's assumptions are valid?
> I'm trying to rule out possible issues and hunt down the root cause...

The assumption looks reasonable for me, but I am not confident enough to
"confirm" it.

--
Kirill A. Shutemov

\
 
 \ /
  Last update: 2016-03-15 17:21    [W:0.069 / U:0.924 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site