How is run queue length computed in linux proc filesystem

[Valdis.Kletnieks at vt.edu]

On Fri, 16 Aug 2013 14:20:29 +0100, emani murali said:

> I'm trying to obtain number of runnable processes from linux kernel.

Why are you trying to get that number, and how important is accuracy?
(Remember that the value of that number can change literally several
tens of thousands of times per second).

> The wiki page http://en.wikipedia.org/wiki/Load_(computing) provides some
> insight into how run queue length is computed based on ldavg values but it
> is unclear. Can someone provide more pointers on this. Cheers

Actually, you have that backwards.  Load average is computed based on run queue
length.
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