Re: [PATCH] samples/bpf: Add program for CPU state statistics

[Leo Yan <leo.yan@linaro.org>]

Hi Jesper,

On Wed, Jan 31, 2018 at 10:14:27AM +0100, Jesper Dangaard Brouer wrote:
> On Wed, 31 Jan 2018 02:29:59 +0800
> Leo Yan <leo.yan@linaro.org> wrote:
> 
> > CPU 0
> > State    : Duration(ms)  Distribution
> > cstate 0 : 47555        |*********************************       |
> > cstate 1 : 0            |                                        |
> > cstate 2 : 0            |                                        |
> > pstate 0 : 15239        |*********                               |
> > pstate 1 : 1521         |                                        |
> > pstate 2 : 3188         |*                                       |
> > pstate 3 : 1836         |                                        |
> > pstate 4 : 94           |                                        |
> > 
> > CPU 1
> > State    : Duration(ms)  Distribution
> > cstate 0 : 87           |                                        |
> > cstate 1 : 16264        |**********                              |
> > cstate 2 : 50458        |***********************************     |
> > pstate 0 : 832          |                                        |
> > pstate 1 : 131          |                                        |
> > pstate 2 : 825          |                                        |
> > pstate 3 : 787          |                                        |
> > pstate 4 : 4            |                                        |
> > 
> > CPU 2
> > State    : Duration(ms)  Distribution
> > cstate 0 : 177          |                                        |
> > cstate 1 : 9363         |*****                                   |
> > cstate 2 : 55835        |*************************************** |
> > pstate 0 : 1468         |                                        |
> > pstate 1 : 350          |                                        |
> > pstate 2 : 1062         |                                        |
> > pstate 3 : 1164         |                                        |
> > pstate 4 : 7            |                                        |
> 
> The output gets very long as the number of CPUs grow...
> What about using the following output:
> 
> state(ms)  cstate-0  cstate-1  cstate-2  pstate-0  pstate-1  pstate-2  pstate-3  pstate-4
> CPU-0        47,555         0         0    15,239     1,521     1,836     1,836        94
> CPU-1            87    16,264    50,458       832       131       825       787         4
> CPU-2           177     9,363    55,835     1,468       350     1,062     1,164         7
> 
> Look at the code samples/bpf/xdp_redirect_cpu_user.c for an examples of
> howto align the columns, and the trick to get printf to pretty print
> with thousands separators use %' and setlocale(LC_NUMERIC, "en_US").

Thanks a lot for suggestion.  Using row/columns looks good for me,
will change code for this way.

> P.S. net-next and bpf-next is closed at the moment.
>  Next time you submit read[1] and [2], especially howto indicate which
> tree (bpf vs. bpf-next) the patch is against, as this helps the
> workflow of the maintainers.

Yeah, will read the docs and follow up the workflow and send new patch
to target next merge window.

Thanks,
Leo Yan

> [1] https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/tree/Documentation/bpf/bpf_devel_QA.txt
> [2] Documentation/networking/netdev-FAQ.txt 
> -- 
> Best regards,
>   Jesper Dangaard Brouer
>   MSc.CS, Principal Kernel Engineer at Red Hat
>   LinkedIn: http://www.linkedin.com/in/brouer