[Bug bpf/23478] New: bpf: multi-key associative arrays

[me at serhei dot io]

https://sourceware.org/bugzilla/show_bug.cgi?id=23478

            Bug ID: 23478
           Summary: bpf: multi-key associative arrays
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: bpf
          Assignee: systemtap at sourceware dot org
          Reporter: me at serhei dot io
  Target Milestone: ---

From the 'language features' brainstorm:

# More complex structures: multi-key associative arrays

It's theoretically possible to have a large struct as the key to a hash map.
Thus, a key could literally be a structure with 2 (or more) embedded strings.
It seemed to work fine when I used a 128-byte map key size, so two 64-byte
string keys should be doable at the very least.

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