Thank Matthew for correcting me On Sun, Feb 13, 2022 at 12:09 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: > > On Sun, Feb 13, 2022 at 11:19:09AM +0800, Zhouyi Zhou wrote: > > I think the key to the problem lies in your attached console.log > > (pasted below), at times 0.014987 and 0.015995, I see there are two > > locks (cpu_hotplug_lock and jump_label_mutex) holded while > > kmem_cache_alloc calls __might_resched (0.023356). > > Those are both sleeping locks (a percpu_rwsem and mutex, respectively). > There is no problem with sleeping while holding a mutex or rwsem.
