From: "Juliano F. Ravasi" <ml-3xekma+8Mi6ZuzBka8ofvg@public.gmane.org>
To: mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Problem in proc(5), regarding loadavg
Date: Mon, 25 May 2009 15:22:09 -0300 [thread overview]
Message-ID: <4A1AE1D1.4080006@juliano.info> (raw)
Hi,
I found that the information on proc(5) in the latest version of
man-pages (3.21) do not seem to match the real implementation, regarding
the file /proc/loadavg.
The manual page says that:
"The first of these [the two numbers of the fourth field] is the
number of currently executing kernel scheduling entities
(processes, threads); this will be less than or equal to the
number of CPUs."
By looking at the implementation in (v2.6.29)/fs/proc/loadavg.c, this
field returns the value of `nr_running()', which is defined in
/kernel/sched.c and returns the current number of *runnable* threads. It
is easily verifiable that this value may and will be greater the number
of CPUs if you start a number of processing-intensive threads, then
inspect /proc/loadavg.
Best regards,
Juliano.
--
Juliano F. Ravasi ·· http://juliano.info/
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"A candle loses nothing by lighting another candle." -- Erin Majors
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reply other threads:[~2009-05-25 18:22 UTC|newest]
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