On Wed, Sep 28, 2011 at 1:18 PM, Daniel Lezcano <daniel.lezc...@linaro.org> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > Hi all, > > here are some tests to test the cpu hotplug. > > Any feedback would be appreciate > > Thanks a lot > > -- Daniel > > > Test 1: check the sysfs files are present > ========================================= > > for each cpu > * check /sys/devices/system/cpu/cpuX/online is there > > What about the particular case for cpu0 where the 'online' file is there > but shouldn't as the other arch ? > > > Test 2: check cpu state is reflected in sysfs > ============================================= > > for each cpu > * set cpuX offline > * check cpuX status is offline > * set cpuX back online > * check cpuX status is online > > Test 3: check the affinity does not work on an online cpu
^^^^ offline > ========================================================= > > for each cpu > * set cpuX offline > * check 'taskset -c X /bin/true' fails > * set cpuX back online > > Test 4: check cpus are reflected on /proc/cpuinfo correctly > =========================================================== > > NRCPUS=<number of configured cpu on the system> > > for each cpu > * set cpuX offline > * check /proc/cpuinfo 'processor' keyword count is 'NRCPUS - 1' > * check the processor keyword contains a cpu id different from the cpu > we offlined > * set cpuX back online > > Test 5: test userspace notification > =================================== > > for each cpu > * set cpuX offline > * check from userspace notification has been done with the command > 'udevadm monitor --kernel --subsystem-match=cpu' > * and the event is related to the cpuX and 'offline' > * set the cpu online > * check from userspace notification has been done with the command > 'udevadm monitor --kernel --subsystem-match=cpu' > * and the event is related to the cpuX and 'online' > > Test 6: do some stress test > =========================== > > for each cpu > * for i in 1 .. 50 > * set cpuX offline > * set cpuX back online How about something that measures the latency of a hotplug under 2-3 different workloads. Vincent has scripts that might help with that. The higher the workload, the higher the hotplug latency due to task migration. It would also be interesting to know what happens when processes pinned to a cpu have the cpu offlined underneath them. /Amit _______________________________________________ linaro-dev mailing list linaro-dev@lists.linaro.org http://lists.linaro.org/mailman/listinfo/linaro-dev
