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

(2012/08/22 22:41), Steven Rostedt wrote:

On Wed, 2012-08-22 at 17:43 +0900, Yoshihiro YUNOMAE wrote:

quoted

From: Masami Hiramatsu <redacted>

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.

Thank you,


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