Re: Infrastructure for zerocopy I/O

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On Tue, 17 Nov 2015, Steinar H. Gunderson wrote:

> On Tue, Nov 17, 2015 at 02:07:58PM -0500, Alan Stern wrote:
> > Is there an API for allocating user memory below 4 GB?  Would a new 
> > MMAP flag be acceptable?
> 
> MAP_32BIT (to mmap) can seemingly do this, but from the man page, it sounds
> more like a kludge than anything else.

No, that's not what I'm talking about.  MAP_32BIT means that the new 
memory's _virtual_ address should be below 2 GB.  I'm talking about the 
_physical_ address.

Alan Stern

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