How is run queue length computed in linux proc filesystem

[Rik van Riel]

On 08/16/2013 09:20 AM, emani murali wrote:
> Hi,
>
> I'm trying to obtain number of runnable processes from linux kernel. sar
> -q gives this information readily. However I'm trying to get this value
> from /proc filesystem. There is no file in /proc that gives this value
> directly, then how is runq-sz computed.

Tools like top, vmstat, and sar, simply look at all the processes
in /proc, and count the number that are in runnable (R) state.

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