[PATCH][RFC] NAND subpage read feature. Take 2.

[Jörn Engel]

On Sun, 4 May 2008 12:46:31 +0400, Alexander Belyakov wrote:
> On Fri, May 2, 2008 at 12:25 AM, Jörn Engel <joern at logfs.org> wrote:
> >
> > ...and creates a peculiar conflict of interests in me.  I've added full
> > caching of the complete mtd in logfs, which gave a huge speedup to some
> > of my testcases.  However caching is done in page granularity, therefore
> > it would completely defeat this patch, which also gives a speedup.
> 
> There is a special case for page aligned data where generic
> read_page() is being used instead of read_subpage(). I believe logfs
> caching won't suffer from this patch.

Actually, logfs caching would help jffs2 as well, as soon as you have
several parallel readers.  It should be made generic mtd caching.  And
when made generic, it would effectively defeat this patch, as all reads
would be (DRAM-) pagesized.

We could theoretically use buggerheads and do the caching in smaller
granularities.

Jörn

-- 
All models are wrong. Some models are useful.
-- George Box