Re: [patch V2 21/29] tracing: Use percpu stack trace buffer more intelligently

Thomas Gleixner
2019-04-18T15:43:59Z

On Thu, 18 Apr 2019, Steven Rostedt wrote:
> On Thu, 18 Apr 2019 10:41:40 +0200
> Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org> wrote:
> > -static DEFINE_PER_CPU(struct ftrace_stack, ftrace_stack);
> > +/* This allows 8 level nesting which is plenty */
>
> Can we make this 4 level nesting and increase the size? (I can see us
> going more than 64 deep, kernel developers never cease to amaze me ;-)
> That's all we need:
>
> Context: Normal, softirq, irq, NMI
>
> Is there any other way to nest?

Not that I know, but you are the tracer dude :)

Thanks,

tglx