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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