Hello,

On Mon, Jan 22, 2024 at 08:55:39PM -0500, Steven Rostedt wrote:

On Tue, 23 Jan 2024 09:44:43 +0800
George Guo [off-list ref] wrote:

quoted

There are two reasons of percpu_alloc failed without warnings: 

1. do_warn is false
2. do_warn is true and warn_limit is reached the limit.

Yes I know the reasons.

quoted

Showing do_warn and warn_limit makes things simple, maybe dont need
kprobe again.

It's up to the maintainers of that code to decide if it's worth it or not,
but honestly, my opinion it is not.

I agree, I don't think this is a worthwhile change. If we do change
this, I'd like it to be more actionable in some way and as a result
something we can fix or tune accordingly.

George is this a common problem you're seeing?

The trace event in question is to trace that percpu_alloc failed and why.
It's not there to determine why it did not produce a printk message.

-- Steve

Thanks,
Dennis