Re: [RFC] hw/nvme: Use irqfd to send interrupts

[Jinhao Fan]

at 3:36 AM, Stefan Hajnoczi <stefanha@gmail.com> wrote:

> 
> 
> On Sun, Jul 24, 2022, 11:21 Jinhao Fan <fanjinhao21s@ict.ac.cn> wrote:
> at 9:29 PM, Stefan Hajnoczi <stefanha@gmail.com> wrote:
> 
> > 
> > Nice, perf(1) is good for that. You can enable trace events and add
> > kprobes/uprobes to record timestamps when specific functions are entered.
> > 
> 
> Thanks Stefan,
> 
> One last question: Currently we can achieve hundreds of KIOPS. That means
> perf can easily capture millions of trace events per second. I found perf
> has quite high overhead at such a rate of trace events. Do you have any
> advices on tracing high IOPS tasks?
> 
> I don't. BTW uprobes are expensive but kprobes are cheaper.
> 
> Stefan

Gotcha. Thanks!

Jinhao Fan