Re: [PATCH] perf: use default compiler mode by default

[Paul Mackerras]

Ingo Molnar writes:

> I'd still like to hear back from Paulus whether PowerPC is affected 
> negatively - IIRC it was PowerPC where we got the -m64 from originally.

It seems that a 32-bit perf now works on a 64-bit kernel on powerpc,
so I don't have any hard objection to this patch.  (For some reason,
perf top isn't getting any samples, so I'll have to chase that.)

Many distros on powerpc default to 32-bit userspace on 64-bit
machines, since that has a slight performance and size benefit for
most programs.  I expect perf is better as a 64-bit binary, since it
does a lot of 64-bit arithmetic, so users of those distros on 64-bit
machines would need to do "make EXTRA_CFLAGS=-m64".

Paul.
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