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Add support to monitor bpf programs. #88

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Add support to monitor bpf programs. #88

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Commits on Jul 9, 2020

  1. Add support to monitor bpf programs. 

    BPF is very important component for modern Linux systems, and getting more
features and adoptions. This commit enables atop to monitor BPF programs.

The output looks like:

ATOP - kerneltest002       2020/06/16  17:01:12       --------------       10s elapsed
PRC |  sys    2.72s |  user   4.85s |  #proc    761  | #zombie    0  | #exit    250  |
CPU |  sys      29% |  user     50% |  irq       0%  | idle   7915%  | wait      8%  |
CPL |  avg1    1.68 |  avg5    1.05 |  avg15   0.72  | csw   160979  | intr   66341  |
[...]
BPF_PROG_ID                       NAME  TOTAL_TIME_NS      RUN_CNT     CPU AVG_TIME_NS
        894            tracepoint__sch          83882           11      0%     7625.64
        893            tracepoint__sch          43231            5      0%     8646.20
        892            tracepoint__tas          34818            4      0%     8704.50
    PID SYSCPU USRCPU  VGROW  RGROW  RDDSK  WRDSK EXC  THR S CPUNR  CPU CMD      1/113
2669644  0.45s  1.08s 603.1M 23100K     0K     0K   -   10 S    59  15% squashfuse_ll

To build atop with BPF monitoring, we need pass in option to make as:

    ATOP_BPF_SUPPORT=1 make -j

Atop periodically enables monitoring of BPF programs calling:
    bpf_enable_stats(BPF_STATS_RUN_TIME);

Since monitoring of BPF program has non-trivial overhead to the bpf
programs, the following options are added to only monitor BPF program
less often:

    bpfsamplerate, default 1
    bpfsampleinterval, default 1

bpf stats is enabled for bpfsampleinterval seconds every bpfsamplerate
atop intervals. bpfsampleinterval must be smaller than atop interval.

Changes v1 => v2:
1. Instead of using unsafe sysctl, using a safe new API to enable BPF
   runtime stats.
2. Change output columns: remove "TYPE", add "CPU" for cpu %.
    @liu-song-6
    liu-song-6 committed Jul 9, 2020
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