Re: [PATCH 2/5] trace-cmd: Use tracing directory to count CPUs

[Masami Hiramatsu]

(2012/08/23 11:01), Masami Hiramatsu wrote:
> (2012/08/22 22:41), Steven Rostedt wrote:
>> On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:
>>> From: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
>>>
>>> Count debugfs/tracing/per_cpu/cpu* to determine the
>>> number of CPUs.
>>
>> I'm curious, do you find that sysconf doesn't return the # of CPUs the
>> system has?
> 
> No, sysconf returns the number of hosts CPUs, not guests.
> 
>> I've had boxes where the per_cpu/cpu* had more cpus than the
>> box actually holds. But this was a bug in the kernel, not the tool. This
>> change log needs to have rational instead of just explaining what the
>> patch does.
> 
> Ah, I see. Hmm, then this should be enabled by a command line
> option or an environment variable.

Oops, I misunderstood. I'll add more comment for why this
should be tried instead of sysconf.

Thank you,
-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@xxxxxxxxxxx


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