Re: [PATCH RFC 4/5] block: add a statistic table for io latency

[Guoqing Jiang <guoqing.jiang@xxxxxxxxxxxxxxx>]

On 7/8/20 4:02 PM, Guoqing Jiang wrote:
> > Hi Guoqing,
> >
> > I believe it isn't hard to write a ebpf based script(bcc or bpftrace) to
> > collect this kind of performance data, so looks not necessary to do it
> > in kernel.
>
> Hi Ming,
>
> Sorry, I don't know well about bcc or bpftrace, but I assume they need to
> read the latency value from somewhere inside kernel. Could you point
> how can I get the latency value? Thanks in advance!

Hmm, I suppose biolatency is suitable for track latency, will look into it.

Thanks,
Guoqing