Re: UBI memory usage on large page nand

[Artem Bityutskiy <dedekind1@gmail.com>]

On Fri, 2011-04-15 at 16:13 +0300, Artem Bityutskiy wrote:
> On Fri, 2011-04-15 at 17:23 +0800, Nicholas wrote:
> > Dear Artem,
> > 
> > Thanks for the information. Indeed it has flexibility to be freed or consumed.
> > Due to my case, i need to use maximum memory space while in the
> > meantime i also need to write files into nand via ubi.
> > 8KB page of nand flash will consume 16MB for a single volume on a
> > single UBI MTD.
> > 
> > 1. Is there any idea to reduce the memory consumption ?
> 
> Yes. The main idea is as I described: both UBI and UBIFS have several
> multiple PEB-size buffers at attach/mount time. I did not count them,
> but I think there may be about 6 of them. All these buffers are
> allocated using vmalloc(), so you can easily fine all of them, because
> 'vmalloc()' is used only for those buffers.

And note, this is all off the top of my head, I might be mistaken
somewhere. If you need this - you need to spend time with the code and
try. I'm all yours helping you by looking at your patches and advising.

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)