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authorPeter Zijlstra <peterz@infradead.org>2017-09-20 19:00:21 +0200
committerThomas Gleixner <tglx@linutronix.de>2017-09-25 22:11:44 +0200
commit1db49484f21ed0fcdadd0635a3669f5f386546fa (patch)
tree533d9d2c340550a1b60bafcf77eff90fce1fe409 /include
parentsmp/hotplug: Differentiate the AP completion between up and down (diff)
downloadlinux-1db49484f21ed0fcdadd0635a3669f5f386546fa.tar.xz
linux-1db49484f21ed0fcdadd0635a3669f5f386546fa.zip
smp/hotplug: Hotplug state fail injection
Add a sysfs file to one-time fail a specific state. This can be used to test the state rollback code paths. Something like this (hotplug-up.sh): #!/bin/bash echo 0 > /debug/sched_debug echo 1 > /debug/tracing/events/cpuhp/enable ALL_STATES=`cat /sys/devices/system/cpu/hotplug/states | cut -d':' -f1` STATES=${1:-$ALL_STATES} for state in $STATES do echo 0 > /sys/devices/system/cpu/cpu1/online echo 0 > /debug/tracing/trace echo Fail state: $state echo $state > /sys/devices/system/cpu/cpu1/hotplug/fail cat /sys/devices/system/cpu/cpu1/hotplug/fail echo 1 > /sys/devices/system/cpu/cpu1/online cat /debug/tracing/trace > hotfail-${state}.trace sleep 1 done Can be used to test for all possible rollback (barring multi-instance) scenarios on CPU-up, CPU-down is a trivial modification of the above. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: bigeasy@linutronix.de Cc: efault@gmx.de Cc: rostedt@goodmis.org Cc: max.byungchul.park@gmail.com Link: https://lkml.kernel.org/r/20170920170546.972581715@infradead.org
Diffstat (limited to 'include')
-rw-r--r--include/linux/cpuhotplug.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
index 477b2e6f60f7..6d508767e144 100644
--- a/include/linux/cpuhotplug.h
+++ b/include/linux/cpuhotplug.h
@@ -22,7 +22,8 @@
*/
enum cpuhp_state {
- CPUHP_OFFLINE,
+ CPUHP_INVALID = -1,
+ CPUHP_OFFLINE = 0,
CPUHP_CREATE_THREADS,
CPUHP_PERF_PREPARE,
CPUHP_PERF_X86_PREPARE,