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.
Alan
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