On Mon, Dec 20, 2021 at 4:38 PM Jens Axboe <axboe@xxxxxxxxx> wrote: > > On 12/20/21 12:28 PM, Wander Lairson Costa wrote: > > The running_trace_lock protects running_trace_list and is acquired > > within the tracepoint which implies disabled preemption. The spinlock_t > > typed lock can not be acquired with disabled preemption on PREEMPT_RT > > because it becomes a sleeping lock. > > The runtime of the tracepoint depends on the number of entries in > > running_trace_list and has no limit. The blk-tracer is considered debug > > code and higher latencies here are okay. > > You didn't put a changelog in here. Was this one actually compiled? Was > it runtime tested? It feels like the changelog reached the inboxes after patch (at least mine was so). Would you like that I send a v6 in the hope things arrive in order?
