On Fri, Apr 09, 2004 at 07:51:24PM +0530, Hareesh Nagarajan wrote: > Hi, > > I have created a simple patch that creates a "/proc/jiffies" entry > for the 2.6.x kernel. It can be downloaded off: > http://puggy.symonds.net/~hareesh/ibm/proc-entry-for-jiffies-2.6.3.patch > > I have stated my problem below. I must say that it is driving me quite mad! > > Value printed by uptime > ----------------------- > $uptime > 19:15:08 up 27 min, 1 user, load average: 0.10, 0.10, 0.11 > > Value printed by the jiffies field of the 'current' task > -------------------------------------------------------- > $awk '{print $22}' /proc/self/stat > 183579 > > Which means: 183579/100 seconds = 1835 seconds > 1835/60 minutes = 30 minutes > > [In userspace HZ = 100; In kernel HZ = 1000 ] > > Conclusion > ---------- > Everything seems perfect. > > Value printed by /proc/jiffies (through my patch) > ------------------------------------------------- > $cat /proc/jiffies > jiffies = 1643009 > > Which means: 1643009/1000 seconds = 1643 seconds > 1643/60 minutes = 27 minutes > > What is wrong?? I'm no sure I understand. jiffies is a kernel space values and thus should use kernel space HZ and not USER_HZ. USER_HZ is supposed to be used when converting kernel time to user time for proc interfaces for programs that use the hard wired value of 100 which is used it 2.4 on i386. > Can anyone please check my patch and tell me if anything is wrong. > > Moreover, in the first 3 minutes, cat /proc/jiffies prints junk. > > Any inputs will be appreciated. > > TIA > -- > Hareesh Nagarajan > Bangalore, India > WEB: http://puggy.symonds.net/~hareesh > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > > +++++++++++++++++++++++++++++++++++++++++++ > This Mail Was Scanned By Mail-seCure System > at the Tel-Aviv University CC. > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
