On 07/21/10 07:00, Kostik Belousov wrote:
On Tue, Jul 20, 2010 at 03:48:57PM -0500, Nathan Whitehorn wrote:
On 07/20/10 08:07, John Baldwin wrote:
On Monday, July 19, 2010 5:30:54 pm Kostik Belousov wrote:
Hi,
I intend to commit the following change, that makes sysctls
hw.machine_arch and hw.machine to return "i386" for 32 bit
binaries run on amd64. In particular, 32 bit uname -m and uname -p
print "i386", that is good for i386 jails on amd64 kernels.
I find the change very useful for me, but I wonder why such trivial
modification is not yet done. Can anybody note a possible fallout from
it ?
Presumably ia64 and powerpc64 would need a similar change as well? It
looks
fine to me. I suspect Y! used the UNAME_* approach as it didn't add yet-
another local diff to maintain in the kernel, and the uname fixes at Y!
might
have predated SCTL_MASK32.
Maybe it makes sense to define a MACHINE_ARCH32 in machine/param.h, as
is done for ELF_ARCH32 in machine/elf.h? This would keep the MI code in
the kernel MI, and ever-so-slightly simplify implementation for ia64,
mips, and powerpc64. Thanks for doing this!
See below. Also, I painted red another wall, adding a sysctl to turn
the adaptive behaviour off.
I quite like the shade you've chosen!
-Nathan
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