linux-kernel - Bug: 2.6.15 Process accounting fails to account for small time slice loads (still)

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Message-ID: <671c20540701300824p54dad7dbw43fe916bc8c98d45@mail.gmail.com>
Date:	Tue, 30 Jan 2007 11:24:12 -0500
From:	"Tom Burns" <tom.i.burns@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Bug: 2.6.15 Process accounting fails to account for small time slice loads (still)

The bug described back in 2004 in the following message still seems to exist:

http://linux.derkeiler.com/Mailing-Lists/Kernel/2004-05/4313.html

Essentially, it appears that if a process sleeps before it uses up a
complete jiffy then no charge is made to its process accounting table.

This problem still exists in the same manner in kernel:

 2.6.15-1.2054_FC5smp #1 SMP Tue Mar 14 16:05:46 EST 2006 i686 i686
i386 GNU/Linux

The linked message above contains the necessary code to easily test
for the problem.  It compiles cleanly, just be sure to include -lrt on
the command line.

Cheers,
Tom Burns
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