svn commit: r221855 - in head/sys: amd64/include arm/include dev/md dev/null i386/include ia64/include mips/include powerpc/include sparc64/include sun4v/include sys vm

[Kostik Belousov]

On Fri, May 13, 2011 at 02:45:47PM -0500, Alan Cox wrote:
> On 5/13/2011 2:40 PM, Kostik Belousov wrote:
> >On Fri, May 13, 2011 at 07:35:01PM +0000, Matthew D Fleming wrote:
> >>Author: mdf
> >>Date: Fri May 13 19:35:01 2011
> >>New Revision: 221855
> >>URL: http://svn.freebsd.org/changeset/base/221855
> >>
> >>Log:
> >>   Move the ZERO_REGION_SIZE to a machine-dependent file, as on many
> >>   architectures (i386, for example) the virtual memory space may be
> >>   constrained enough that 2MB is a large chunk.  Use 64K for arches
> >>   other than amd64 and ia64, with special handling for sparc64 due to
> >>   differing hardware.
> >>
> >>   Also commit the comment changes to kmem_init_zero_region() that I
> >>   missed due to not saving the file.  (Darn the unfamiliar development
> >>   environment).
> >>
> >>   Arch maintainers, please feel free to adjust ZERO_REGION_SIZE as you
> >>   see fit.
> >>
> >>   Requested by:	alc
> >>   MFC after:	1 week
> >>   MFC with:	r221853
> >Wasting 2MB even on amd64 is not quite good, IMHO.
> 
> It's virtual address space, of which we have 512GB on amd64, and not 
> physical memory.  Only one page of physical memory is used.

I should have read the patch more careful. Sorry.
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