Re: [RFC] [PATCH] [2.5.35] Run Queue Statistics

[Andrew Morton]

Rik van Riel wrote:
> 
> On Tue, 17 Sep 2002, Anton Blanchard wrote:
> 
> > On a semi related note, vmstat wants to know the number of running,
> > blocked and swapped processes. strace vmstat one day and you will see it
> > currently opens /proc/*/stat (ie one open for each process) just to get
> > these stats.  Yet another place where the monitoring utilities disturb
> > the system way too much.
> >
> > Can we get some things in /proc/stat to give us these numbers? Does
> > "swapped" make any sense on Linux?

Certainly sounds good.  Opening every /proc/<pid>/stat is gross.

> Runnable can be done currently, blocked on IO is trivial once
> Andrew has pushed the iowait stats to Linus.
> 

That'll be a while off yet. I'd like to make sure that we have
all the externally visible changes stable for a week or so,
/proc/diskstats settled down, userspace updated and tested etc.

Just to minimise the disruption and churn which these changes
will cause.