Re: kprobe: __blkdev_put probe is missed

[Steven Rostedt]

On Fri, 19 Jun 2020 15:28:59 +0800
Ming Lei <ming.lei@xxxxxxxxxx> wrote:

> > 
> > OK, then let's make events (for sure)
> > 
> > root@devnote2:/sys/kernel/debug/tracing# echo p __blkdev_put >> kprobe_events 
> > root@devnote2:/sys/kernel/debug/tracing# echo r __blkdev_put >> kprobe_events 
> > root@devnote2:/sys/kernel/debug/tracing# echo p blkdev_put >> kprobe_events 

Hi Ming,

Do you have the kprobe_events file?

> > root@devnote2:/sys/kernel/debug/tracing# echo 1 > events/kprobes/enable   
> 
> I can't find 'events/kprobes' in my VM with upstream kernel, also not found
> the dir under fedora31(5.5.15-200) & rhel8(v4.18 based).

The events/kprobes directly will be created when you create a
kprobe_event. It wont exist until then.

-- Steve