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

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

[wcohen at redhat dot com]

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

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wcohen at redhat dot com

--- Comment #1 from William Cohen <wcohen at redhat dot com> ---
This would also be useful for the @entry support. A number of the systemtap
examples fail like in the following way:

TEST
PWD=/home/wcohen/systemtap_write/systemtap/testsuite/systemtap.examples/memory
meta taglines 'test_check: stap -p4 overcommit.stp' tag 'test_check' value
'stap -p4 overcommit.stp'
attempting command stap --bpf -p4 overcommit.stp
OUT semantic error: unhandled multi-dimensional array: identifier '$pages' at
overcommit.stp:6:40
        source:              execname(), pid(), @entry($pages))
                                                       ^

Pass 4: compilation failed.  [man error::pass4]
child process exited abnormally
RC 1
FAIL: systemtap.examples/memory/overcommit build

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

[wcohen at redhat dot com]

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

William Cohen <wcohen at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2019-08-20
     Ever confirmed|0                           |1

--- Comment #2 from William Cohen <wcohen at redhat dot com> ---
There is a initial patch on
https://sourceware.org/git/gitweb.cgi?p=systemtap.git;a=shortlog;h=refs/heads/wcohen/pr23478
that allows use of multi-dimensional arrays with the exception of foreach
statements for multi-dimensional arrays.

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

[me at serhei dot io]

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

--- Comment #3 from Serhei Makarov <me at serhei dot io> ---
Implemented support for foreach iterations in multi-key associative arrays.

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