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 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
