Re: [PATCH 1/3 v3] dma: document dma_{un}map_{single|sg}_attrs() interface

[akepner]

On Fri, Feb 29, 2008 at 12:37:56PM -0600, James Bottomley wrote:
> ....
> To be honest, I still don't like the name.  SYNC_ON_WRITE is the SN2
> implementation.  What it's actually doing is implementing strict
> ordering semantics.  I think it should really be
> DMA_ATTR_STRICT_ORDERING (with a corresponding
> DMA_ATTR_RELAXED_ORDERING)....

I've been thinking about a new name, but don't like 
DMA_ATTR_STRICT_ORDERING. 

What I'm trying to do is to establish order (across 
a NUMA fabric) of DMA to different memory regions, i.e., 
DMA to memory region A forces all outstanding DMA (to 
memory regions B, C,....) to complete first.

DMA_ATTR_STRICT_ORDERING sounds like a PCI thing to me, 
and this is a NUMA interconnect thing.

-- 
Arthur

--
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/