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To: Tom Holroyd <tomh@po.crl.go.jp>
Cc: Tim Schmielau <tim@physik3.uni-rostock.de>,
        kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: Unknown HZ value! (1908) Assume 1024.
In-Reply-To: <Pine.LNX.4.44.0202191000030.26361-100000@holly.crl.go.jp>
X-Yow: Can I have an IMPULSE ITEM instead?
From: Andreas Schwab <schwab@suse.de>
Date: Tue, 19 Feb 2002 11:47:30 +0100
In-Reply-To: <Pine.LNX.4.44.0202191000030.26361-100000@holly.crl.go.jp> (Tom
 Holroyd's message of "Tue, 19 Feb 2002 10:47:34 +0900 (JST)")
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Tom Holroyd <tomh@po.crl.go.jp> writes:

|> So what is the 4th value in /proc/stat (procps calls it "other", while
|> the first 3 are "user", "nice", and "sys")?  According to
|> linux/fs/proc/proc_misc.c, it is:
|> 
|> 	jif * smp_num_cpus - (user + nice + system)
|> 
|> formatted with a %lu (the others are just %u).  smp_num_cpus is 1.
|> Things are declared this way:
|> 
|>         unsigned long jif = jiffies;
|>         unsigned int sum = 0, user = 0, nice = 0, system = 0;
|> 
|> So, the problem is that user + nice + system overflows (I'm compiling
|> with gcc 3.0, BTW).
|> 
|> Thanks for the clue; now, how to fix it?

Changing the line to this:

 	jif * smp_num_cpus - user - nice - system

should avoid the overflow.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE GmbH, Deutschherrnstr. 15-19, D-90429 N?rnberg
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"And now for something completely different."
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