[PATCH v4] Retry Large Buffer Allocations

[Artem Bityutskiy]

On Thu, 2011-04-07 at 10:40 -0700, Grant Erickson wrote:
> When handling user space read or write requests via mtd_{read,write}
> or JFFS2 medium scan requests, exponentially back off on the size of
> the requested kernel transfer buffer until it succeeds or until the
> requested transfer buffer size falls below the page size.
> 
> This helps ensure the operation can succeed under low-memory,
> highly-fragmented situations albeit somewhat more slowly.
> 
>   v2: Incorporated coding style and comment feedback from Artem.
>   v3: Incorporated more feedback from Artem. Retargeted patch against
>       l2-mtd-2.6.
>   v4: Incorporated feedback from Artem about compilation on 64-bit
>       architectures.
> 
> Signed-off-by: Grant Erickson <marathon96 at gmail.com>
> ---
>  drivers/mtd/mtdchar.c   |   50 +++++++++++++++++++++-------------------------
>  drivers/mtd/mtdcore.c   |   41 ++++++++++++++++++++++++++++++++++++++
>  fs/jffs2/scan.c         |   19 ++++++++++-------
>  include/linux/mtd/mtd.h |    2 +
>  4 files changed, 77 insertions(+), 35 deletions(-)

Ideally, you should have split this on 3 patches and send a series, but
well, I already kind of said that were the last requests, so I do not
push for this. I've just taken this to my l2-mtd-2.6.git.

But if you can, please split the patch on 3 patches:

1. Introduces mtd_kmalloc_up_to - explain the reasons we need this func.
2. Start using it in mtdcore
3. Start using it in JFFS2

This is nicer way.

But if you do not do this, I do not mind. Thanks!

-- 
Best Regards,
Artem Bityutskiy (Артём Битюцкий)