Re: [PATCH 03/13] scsi: unify allocation of scsi command and sensebuffer

From: FUJITA Tomonori
Date: Tue May 26 2009 - 00:38:21 EST

On Mon, 25 May 2009 18:45:25 -0700
Roland Dreier <rdreier@xxxxxxxxx> wrote:

> > Ideally there should be a MACRO that is defined to WORD_SIZE on cache-coherent
> > ARCHs and to SMP_CACHE_BYTES on none-cache-coherent systems and use that size
> > at the __align() attribute. (So only stupid ARCHES get hurt)
> this seems to come up repeatedly -- I had a proposal a _long_ time ago
> that never quite got merged, cf and
> -- from 2002 (!?). The idea is to go a

Yeah, I think that Benjamin did last time:

IIRC, James didn't like it so I wrote the current code. I didn't see
any big performance difference with scsi_debug:

Jens, you see the performance difference due to this unification?

Personally, I don't fancy __cached_alignment__ annotation much. I
prefer to leave it behind a memory allocator.

> step further and create a __dma_buffer annotation for structure members.

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