Re: Release of UBIL: ubi with log

[Artem Bityutskiy <dedekind1@gmail.com>]

On Fri, 2010-04-02 at 00:36 +0530, Brijesh Singh wrote:
> On Thu, Apr 1, 2010 at 5:29 PM, Corentin Chary <corentin.chary@gmail.com> wrote:
> > On Thu, Apr 1, 2010 at 1:14 PM, Brijesh Singh <brijesh.s.singh@gmail.com> wrote:
> >> Hi,
> >>
> >> On Wed, Mar 31, 2010 at 6:27 PM, Corentin Chary
> >> <corentin.chary@gmail.com> wrote:
> >>> On Tue, Mar 2, 2010 at 8:45 PM, Artem Bityutskiy <dedekind1@gmail.com> wrote:
> >>>> On Fri, 2010-02-26 at 18:28 +0530, Brijesh Singh wrote:
> >>>>> Hi,
> >>>>>  It gives me great pleasure in sharing UBIL: ubi with log.  We have
> >>>>> added logging functionality to ubi for reducing mount time.
> >>>>> UBIL uses the "same source base of UBI". The logging functionality can
> >>>>> be added or removed at compile time using "make menuconfig option".
> >>>>>
> >>>>> We have seen mount time reduction of 50% in 1GB NAND. We are expecting
> >>>>> even better results for larger flash memories.
> >>>>>
> >>>>> The source code of UBIL can be found in the following git tree:
> >>>>> http://git.infradead.org/users/brijesh/ubi-2.6.git
> >>>>>
> >>>>
> >>>> Sounds interesting! However, I'm out of office till end of March, and
> >>>> won't be able to look closely at this. But hopefully others will try it.
> >>>>
> >>>
> >>> Hi,
> >>> Didn't took the time  to read the code, I'll try to do so soon.
> >>> Could you tell us more about what you did and how it works ?
> >>> Is it similar to yaffs checkpoints ? When are the log written ?
> >> Not sure with yaffs checkpoints.
> >
> > Yaffs works by writting it's internal memory representation on the
> > nand while unmounting, so it seems to be different.
> 
> Right now, all the valid log is kept in buffer. This is written at
> umount/ when log is full.

So do you mean that in case of a power-cut, the log is lost and UBI will
have to do scanning?

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)