Hi Nicolas, On Tue, May 13, 2014 at 11:25 PM, Nicolas Pitre <nicolas.pitre@xxxxxxxxxx> wrote: > On Tue, 13 May 2014, Abhilash Kesavan wrote: > >> This is v6 of the series adding MCPM backend support for SMP secondary boot >> and core switching on Samsung's Exynos5420. The patches are based on the mcpm >> support added for Exynos5420 in the Chromium kernel repository here: >> https://chromium.googlesource.com/chromiumos/third_party/kernel-next/+/chromeos-3.8 >> >> The patches have been prepared on Kukjin Kim's for-next branch and tested on >> SMDK5420 EVT1 as well as an exynos5420 based chromebook (peach-pit) using the >> "/dev/b.L_switcher" user interface. Secondary core boot-up has also been tested >> on both the boards. > > OK... Now it is time for real testing. :-) > > The /dev/b.L_switcher interface tests the switcher. Here you really > want to hammer the MCPM functionalities and especially your backend code > as hard as possible. I therefore recommend the following test script: > > ---------- >8 > #!/bin/bash > > echo 0 >/sys/kernel/bL_switcher/active > sleep 1 > > pids= > for cpu in /sys/devices/system/cpu/cpu?/online; do > { cpu_nr=${cpu:27:1} > while true; do > echo 1 > $cpu 2> /dev/null > sleep .00$RANDOM > val1=$(cat $cpu) > echo 0 > $cpu 2> /dev/null > sleep .00$RANDOM > val0=$(cat $cpu) > [ "$val1" = "1" -a "$val0" = "0" ] && echo -n $cpu_nr > done > } & > pids="$pids $!" > done > > trap "kill $pids; echo" 0 15 > wait $pids > ---------- >8 > > Leave this running for a couple hours making sure you see all CPU > numbers being printed. The printing order will be random, but each CPU > number should continuously appear. I tried this script and I get two errors: 1) can't create /sys/devices/system/cpu/cpu//online: nonexistent directory 2) sleep: invalid number '.0026736' For 1) the cpu number is not being appended. if I give a particular cpu in the script then hotplug in/out works fine. For 2) a constant msleep 10 works. Is it OK for me to modify the script to hotplug in/off a randomly chosed core ? Regards, Abhilash > > > Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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