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 http://lwn.net/Articles/2265/ and
> http://lwn.net/Articles/2269/ -- 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.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/