Red Hat Bugzilla – Bug 138832
Enable OProfile profile support for UP i686 kernel
Last modified: 2015-01-04 17:11:46 EST
OProfile driver in the 2.6 kernel works in UP kernels; this was not
the case with OProfile driver in the 2.4 kernels. The 2.6 driver has
fallback to a timer interrupt mechanism that will work in the UP kernels.
Enabling this will avoid having to tell people to install SMP kernels
to do performance measurements. It will also allow people to do
performance characterization and tuning on UP machine machines such as
laptops, where improved performance can reduce power consumption and
increased battery life.
Created attachment 106503 [details]
patch to enable oprofile on UP kernel
A minimal enabling so that the oprofile timer interrupt mechanism is available
to collect data on the UP kernel.
Internal RFE bug #139031 entered; will be considered for future releases.
*** Bug 144200 has been marked as a duplicate of this bug. ***
is present in kernel-2.6.9-i686.config, in kernel-2.6.9-6.31.EL.
Is this all that is needed? Done for U1?
should be, though I've personally not tested the functionality.
I installed kernel-2.6.9-6.31.EL.i686.rpm, and verified that it worked as
expected on a UP Athlon machine.
$ opreport --long-filenames
CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
3253 99.1768 /usr/lib/debug/lib/modules/2.6.9-6.31.EL/vmlinux
11 0.3354 /bin/bash
9 0.2744 /lib/tls/libc-2.3.4.so
3 0.0915 /ext3
3 0.0915 /usr/bin/oprofiled
1 0.0305 /jbd