selftests/bpf: add multi-uprobe benchmarks

Add multi-uprobe and multi-uretprobe benchmarks to bench tool.
Multi- and classic uprobes/uretprobes have different low-level
triggering code paths, so it's sometimes important to be able to
benchmark both flavors of uprobes/uretprobes.

Sample examples from my dev machine below. Single-threaded peformance
almost doesn't differ, but with more parallel CPUs triggering the same
uprobe/uretprobe the difference grows. This might be due to [0], but
given the code is slightly different, there could be other sources of
slowdown.

Note, all these numbers will change due to ongoing work to improve
uprobe/uretprobe scalability (e.g., [1]), but having benchmark like this
is useful for measurements and debugging nevertheless.

\#!/bin/bash
set -eufo pipefail
for p in 1 8 16 32; do
    for i in uprobe-nop uretprobe-nop uprobe-multi-nop uretprobe-multi-nop; do
        summary=$(sudo ./bench -w1 -d3 -p$p -a trig-$i | tail -n1)
        total=$(echo "$summary" | cut -d'(' -f1 | cut -d' ' -f3-)
        percpu=$(echo "$summary" | cut -d'(' -f2 | cut -d')' -f1 | cut -d'/' -f1)
        printf "%-21s (%2d cpus): %s (%s/s/cpu)\n" $i $p "$total" "$percpu"
    done
    echo
done

uprobe-nop            ( 1 cpus):    1.020 ± 0.005M/s  (  1.020M/s/cpu)
uretprobe-nop         ( 1 cpus):    0.515 ± 0.009M/s  (  0.515M/s/cpu)
uprobe-multi-nop      ( 1 cpus):    1.036 ± 0.004M/s  (  1.036M/s/cpu)
uretprobe-multi-nop   ( 1 cpus):    0.512 ± 0.005M/s  (  0.512M/s/cpu)

uprobe-nop            ( 8 cpus):    3.481 ± 0.030M/s  (  0.435M/s/cpu)
uretprobe-nop         ( 8 cpus):    2.222 ± 0.008M/s  (  0.278M/s/cpu)
uprobe-multi-nop      ( 8 cpus):    3.769 ± 0.094M/s  (  0.471M/s/cpu)
uretprobe-multi-nop   ( 8 cpus):    2.482 ± 0.007M/s  (  0.310M/s/cpu)

uprobe-nop            (16 cpus):    2.968 ± 0.011M/s  (  0.185M/s/cpu)
uretprobe-nop         (16 cpus):    1.870 ± 0.002M/s  (  0.117M/s/cpu)
uprobe-multi-nop      (16 cpus):    3.541 ± 0.037M/s  (  0.221M/s/cpu)
uretprobe-multi-nop   (16 cpus):    2.123 ± 0.026M/s  (  0.133M/s/cpu)

uprobe-nop            (32 cpus):    2.524 ± 0.026M/s  (  0.079M/s/cpu)
uretprobe-nop         (32 cpus):    1.572 ± 0.003M/s  (  0.049M/s/cpu)
uprobe-multi-nop      (32 cpus):    2.717 ± 0.003M/s  (  0.085M/s/cpu)
uretprobe-multi-nop   (32 cpus):    1.687 ± 0.007M/s  (  0.053M/s/cpu)

  [0] https://lore.kernel.org/linux-trace-kernel/[email protected]/
  [1] https://lore.kernel.org/linux-trace-kernel/[email protected]/

Signed-off-by: Andrii Nakryiko <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

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