[Bug 1922712] Re: add metric for new glibc hwcaps

Łukasz Zemczak 1922712 at bugs.launchpad.net
Thu Apr 15 15:37:42 UTC 2021


Oh man, this is *late*. It's also quite a big change too - only
collecting new information, but still. But yeah, it's either now or in
21.10, so eh. If the desktop team +1's the PR and considers it 'safe' to
land, this has a +1 from the release team.

** Changed in: ubuntu-report (Ubuntu)
       Status: Confirmed => Triaged

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Title:
  add metric for new glibc hwcaps

Status in ubuntu-report package in Ubuntu:
  Triaged

Bug description:
  FFe: We would like to collect that information with 21.04 to get a
  better view of supported hardware for the new hwcaps.  The risk should
  be minimal, only adding an extra flag, and the server side collecting
  the data can handle that, according to Didier.

  pull request at https://github.com/ubuntu/ubuntu-report/pull/34

  we want to collect information which most recent hwcap is supported by
  a machine.  The result should be a string like "x86-64-v2",
  "x86-64-v3", "x86-64-v4", "z13", "z14", "p9", "p10" depending on "ld-
  linux --help" output.  The string should be empty for architectures
  without glibc hwcaps (currently armhf, arm64, i386, riscv64). The
  string should be empty if no specific hwcaps is supported (e.g. on a
  power8 machine). The string should be "" (empty), when trying to run
  ld-linux on a release with glibc (<< 2.33). The string should be "-"
  (dash) when not having any hwcaps mentioned.

  Note that lexical sorting won't work for "p9", "p10".

  if test -x /lib/x86_64-linux-gnu/ld-linux-x86-64.so.2; then
    lddynload=/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
  elif test -x /lib/powerpc64le-linux-gnu/ld64.so.2; then
    lddynload=/lib/powerpc64le-linux-gnu/ld64.so.2
  elif test -x /lib/s390x-linux-gnu/ld64.so.1; then
    lddynload=/lib/s390x-linux-gnu/ld64.so.1
  fi

  supported=
  if [ -n "$lddynload" ]; then
    $lddynload --help 2>&1 | awk '/^Subdirectories/,/^$/'
    supported=$($lddynload --help 2>&1 | awk '/^Subdirectories/,/^$/' | awk '/supported/ {print $1}')
  fi

  Here, $supported has listed all supported hwcaps, not just the best
  supported one.

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