Re: [PATCH v5 1/1] blktrace: switch trace spinlock to a raw spinlock

[Jens Axboe]

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?

-- 
Jens Axboe