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. 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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