[MTD] [NAND] subpage read feature as a way to increase performance.

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This patch enables NAND subpage read functionality.
If upper layer drivers are requesting to read non page aligned data NAND
subpage-read functionality reads the only whose ECC regions which include
requested data when original code reads whole page.
This significantly improves performance in many cases.

Here are some digits :

UBI volume mount time
No subpage reads: 5.75 seconds
Subpage read patch: 2.42 seconds

Open/stat time for files on JFFS2 volume:
No subpage read  0m 5.36s
Subpage read     0m 2.88s

Signed-off-by Alexey Korolev <akorolev@infradead.org>
Acked-by: Artem Bityutskiy <dedekind@infradead.org>
Acked-by: Jörn Engel <joern@logfs.org>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

...

This commit is contained in:

Alexey Korolev 2008-05-15 17:23:18 +01:00 • committed by David Woodhouse

parent ff877ea80e

commit 3d45955962

2 changed files with 91 additions and 1 deletions

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5

include/linux/mtd/nand.h

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