On Wed, 1 Nov 2017, Peter Zijlstra wrote: > On Tue, Oct 31, 2017 at 10:32:00PM +0100, Thomas Gleixner wrote: > > That means we can have the following situation: > > > > lock(watchdog_mutex); > > lockup_detector_reconfigure(); > > cpus_read_lock(); > > stop(); > > park() > > update(); > > start(); > > unpark() > > cpus_read_unlock(); thread runs() > > cleanup(); > > unlock(watchdog_mutex); > > > > Isn't there also a where hardlockup_detector_perf_init() creates an > event to 'probe' stuff, and then hardlockup_detector_perf_enable() > _again_ creates the event?
probe() releases the event.
