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From: John Baldwin <jhb@freebsd.org>
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Subject: Re: PERFMON isn't operational on amd64
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On Tuesday, July 27, 2010 8:43:00 am pluknet wrote:
> Hi.
> 
> What is a status of "options PERFMON" on amd64?
> AFAIK PERFMON opt. was inherited from i386 port and never worked.
> Does it make sense to wipe out perfmon part on amd64?
> 
> buildkernel with PERFMON on results in error:
> /usr/src/sys/amd64/amd64/machdep.c:124:29: error: machine/perfmon.h:
> No such file or directory
> mkdep: compile failed
> *** Error code 1
> 
> Looking at cvs I see amd64/include/perfmon.h was never here.

PERFMON in general is obsoleted by hwpmc(4) which is far more useful and 
featureful.  It should probably just be axed.

-- 
John Baldwin